Okamoto Atsushi

Faculty of Information Science and Technology　Electronics for Informatics　Advanced ElectronicsSpecially Appointed Associate Professor
Last Updated :2026/01/07

■Researcher basic information

Degree

  • Doctor of Engineering, Hokkaido University

Researchmap personal page

Home Page URL

J-Global ID

Research Keyword

  • フォトリフラクティブ効果
  • ホログラフィ
  • 光情報処理
  • 情報光学
  • 光衛星間通信
  • 光通信
  • 位相共役光学
  • 非線形光学
  • 光エレクトロニクス
  • 光インターコネクション
  • 光記録
  • 光メモリ
  • Optical intersatelite communication
  • Optical communication
  • Phase Conjutation
  • Nonlinear Optics
  • Optoelectronics
  • Self organization
  • Optical interconnection
  • Holographic memory
  • Optical storage
  • Optical memory

Research Field

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Communication and network engineering
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electronic devices and equipment
  • Nanotechnology/Materials, Optical engineering and photonics

Educational Organization

■Career

Career

  • 2007
    - 北海道大学准教授（情報科学研究科先端エレクトロニクス講座) 准教授

Committee Memberships

  • 2008 - 2009
    電子情報通信学会, 北海道支部 学生会顧問, Society
  • 2009
    電子情報通信学会, 本部評議員, Society
  • 2008
    電子情報通信学会, 支部評議員, Society
  • 2005 - 2006
    日本光学会, 幹事, Society

■Research activity information

Awards

  • Nov. 2012, Outstanding Student Paper Award, IWH2012　　　　　　　　　　　　　　　
    Interpage crosstalk suppression by spatial spectrum diffusion and digital phase conjugate reconstruction
    Atsushi Shibukawa;Atsushi Okamoto;Yuta Wakayama;Akihisa Tomita;Hisatoshi Funakoshi;Kunihiro Sato
  • Oct. 2012, ISOM2012 Best Student Paper Award　　　　　　　　　　　　　　　
    38-Level Spatial Quadrature-Amplitude Modulation Recording with Double-Referential Holography
    Keisuke Zukeran;Atsushi Okamoto;Masanori Takabayashi;Atsushi Shibukawa;Akihisa Tomita
  • 2006, ISOM Excessent Student Award　　　　　　　　　　　　　　　
  • 2005, Best Paper Award　　　　　　　　　　　　　　　
  • 2005, Best Paper Award　　　　　　　　　　　　　　　
  • 2001, General Research Award　　　　　　　　　　　　　　　
    岡本 淳, Japan

Papers

Other Activities and Achievements

  • Evaluation of robustness against noise in super-resolution complex amplitude measurements using free-space optical propagation and virtual phase conjugation
    松下一歩, 岡本淳, 富田章久, 映像情報メディア学会技術報告(Web), 48, 41(MMS2024 37-42), 2024
  • Evaluation of Reconstruction Image using Encoded lens by Spatial Light Modulator in Virtual Phase Conjugation based Optical tomography
    鈴木謙心, 岡本淳, 山田悠, 富田章久, 映像情報メディア学会技術報告(Web), 48, 41(MMS2024 37-42), 2024
  • Phase compensation method in core-selective switch for few-mode multi-core fiber using spatial light modulator
    渡辺陵, 岡本淳, 富田章久, 電子情報通信学会技術研究報告(Web), 122, 332(OCS2022 59-69), 2023
  • Phase Compensation Method in Mode Selective Switch Using Volume Holographic De-multiplexer
    芳形悠生, 岡本淳, 富田章久, 電子情報通信学会技術研究報告(Web), 123, 243(OCS2023 43-47), 2023
  • Development of non-degenerate entangled photon source using Type-II PPKTP crystal
    松浦巧, 岡本淳, 富田章久, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 84th, 2023
  • High speed QKD with Passive Quench Photon Detectors
    加藤寿嗣, 富田章久, 岡本淳, 金澤昌俊, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 84th, 2023
  • Diffracted Light Phase Compensation in Mode Selective Switch Using Volume Holographic De-multiplexer
    芳形悠生, 岡本淳, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023, 2023
  • Hight-precision Optical Tomography Technique Using Convolutional Neural Networks and Virtual Phase Conjugation
    山田悠, 岡本淳, 大山友暉, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023, 2023
  • Reconfigurable Mode Exchange for Mode Division Multiplexed Signals Using Volume Holograms
    片桐晟博, 岡本淳, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2023, 2023
  • Virtual Phase Conjugation based Optical Tomography using CNN-based High-Precision Optical Complex Amplitude Measurement Technique
    山田悠, 岡本淳, 大山友暉, 富田章久, Optics & Photonics Japan講演予稿集(CD-ROM), 2023, 2023
  • Evaluation of photon number distribution using autocorrelation function for Quantum Key Distribution
    松本遼司, 富田章久, 岡本淳, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 70th, 2023
  • Effect of post-exposure time on diffraction efficiency of volume holograms during recording
    黒田裕也, 岡本淳, 岡本淳, 品田聡, 後藤優太, 富田章久, 映像情報メディア学会技術報告, 46, 6(MMS2022 1-37/ME2022 26-62/AIT2022 1-37), 2022
  • Application of Output Wavefront Compensation in Volume Holographic Mode Demultiplexer to Mode Selective Switch
    芳形悠生, 岡本淳, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022
  • Investigation of Reconstruction Accuracy for Depth Position in Virtual Phase Conjugation for Optical Tomography
    大山友暉, 岡本淳, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022
  • Phase compensation in core selective switch for few-mode multi-core fiber using SLM
    渡辺陵, 岡本淳, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022
  • Proposal of error handling method and wrong reconstruction handling method to broaden the measurable range of reference beam intensity ratio in two-step algorithm
    山岸信博, 岡本淳, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2022, 2022
  • Core selective switch for few-mode multi-core fiber using SLM
    渡辺陵, 岡本淳, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2021, 2021
  • Super-Resolution Complex Amplitude Measurement Using Gaussian Diffuser
    今井凌也, 岡本淳, 富田章久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2021, 2021
  • Measurement of Refractive Index Distribution for Circular Alignment of Multicore Fibers
    橋本大輝, 今井凌也, 岡本淳, 富田章久, 光通信システムシンポジウムプログラム&講演予稿集(CD-ROM), 35th, 2021
  • Improvement of Diffraction Efficiency of Mode Demultiplexer Using Volume Hologram at 1550nm
    柴 泰純, 岡本 淳, 林 穂高, 小川 和久, 富田 章久, 高畠 武敏, 後藤 優太, 品田 聡, 和田 尚也, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 119, 231, 105, 108, 17 Oct. 2019
    電子情報通信学会, Japanese
  • Improvement of Diffraction Efficiency of Mode Demultiplexer Using Volume Hologram at 1550nm
    柴 泰純, 岡本 淳, 林 穂高, 小川 和久, 富田 章久, 高畠 武敏, 後藤 優太, 品田 聡, 和田 尚也, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 119, 230, 105, 108, 17 Oct. 2019
    電子情報通信学会, Japanese
  • Improvement of noise separation accuracy in image reconstruction in virtual phase conjugation based optical tomography
    永吉 颯太, 岡本 淳, 後藤 優太, 小川 和久, 富田 章久, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 118, 449, 71, 74, 19 Feb. 2019
    電子情報通信学会, Japanese
  • Improvement of noise separation accuracy in image reconstruction in virtual phase conjugation based optical tomography
    永吉 颯太, 岡本 淳, 後藤 優太, 小川 和久, 富田 章久, 映像情報メディア学会技術報告 = ITE technical report, 43, 5, 71, 74, Feb. 2019
    映像情報メディア学会, Japanese
  • Reduction of holographic scattering in volume holographic mode de-multiplexer for improvement of diffraction efficiency
    柴泰純, 岡本淳, 岡本淳, 林穂高, 小川和久, 富田章久, 高畠武敏, 高畠武敏, 後藤優太, 品田聡, 和田尚也, 光通信システムシンポジウムプログラム&講演予稿集(CD-ROM), 33rd, 2019
  • 空間クロスモジュレーションを用いた超解像画像投影手法
    LU Yiwo, 岡本淳, 舟越久敏, 小川和久, 富田章久, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 80th, 2019
  • 光の連続性を活用した量子誤り耐性向上手法　　　　　　　　　　　　　　　
    福井浩介, 藤井啓祐, 富田章久, 岡本淳, 日本物理学会誌, 74, 10, 720, 726, 2019
    Japanese
  • Experiment on digital image multiplexing/demultiplexing using virtual phase conjugation for high density holographic memory
    後藤 優太, 岡本 淳, 小川 和久, 富田 章久, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 117, 432, 261, 265, 15 Feb. 2018
    電子情報通信学会, Japanese
  • Experiment on digital image multiplexing/demultiplexing using virtual phase conjugation for high density holographic memory
    後藤 優太, 岡本 淳, 小川 和久, 富田 章久, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 117, 431, 261, 265, 15 Feb. 2018
    電子情報通信学会, Japanese
  • Experiment on digital image multiplexing/demultiplexing using virtual phase conjugation for high density holographic memory
    後藤 優太, 岡本 淳, 小川 和久, 富田 章久, 映像情報メディア学会技術報告 = ITE technical report, 42, 4, 261, 265, Feb. 2018
    映像情報メディア学会, Japanese
  • Experiment on selective mode conversion using dual-phase modulation
    前田 智弘, 岡本 淳, 小川 和久, 富田 章久, 若山 雄太, 釣谷 剛宏, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 117, 196, 51, 55, 31 Aug. 2017
    電子情報通信学会, Japanese
  • Separation Characteristics of Volume Holographic Spatial Mode Demultiplexer at 850 nm Wavelength
    清水 新平, 岡本 淳, 水川 郁弥, 小川 和久, 富田 章久, 高畠 武敏, 品田 聡, 和田 尚也, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 117, 196, 45, 50, 31 Aug. 2017
    電子情報通信学会, Japanese
  • Experiment on Virtual Shift Method for Alignment Error Reduction of Holographic Diversity Interferometry
    山岸 信博, 岡本 淳, 野澤 仁, 後藤 優太, 小川 和久, 富田 章久, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 116, 464, 153, 156, 20 Feb. 2017
    電子情報通信学会, Japanese
  • Characterization of multiplexing technique using virtual phase conjugation for high density holographic memory
    後藤 優太, 岡本 淳, 小川 和久, 富田 章久, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 116, 463, 147, 152, 20 Feb. 2017
    電子情報通信学会, Japanese
  • Experiment on Dual-Wavelength Method toward Spatial Mode De-Multiplexing with Volume Hologram in Optical Communication Wavelength Band
    清水 新平, 岡本 淳, 水川 郁弥, 小川 和久, 富田 章久, 高畠 武敏, 品田 聡, 和田 尚也, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 116, 463, 163, 168, 20 Feb. 2017
    電子情報通信学会, Japanese
  • Experiment on Dual-Wavelength Method toward Spatial Mode De-Multiplexing with Volume Hologram in Optical Communication Wavelength Band
    清水 新平, 岡本 淳, 水川 郁弥, 小川 和久, 富田 章久, 高畠 武敏, 品田 聡, 和田 尚也, 映像情報メディア学会技術報告 = ITE technical report, 41, 5, 163, 168, Feb. 2017
    映像情報メディア学会, Japanese
  • Experiment on Virtual Shift Method for Alignment Error Reduction of Holographic Diversity Interferometry
    山岸 信博, 岡本 淳, 野澤 仁, 後藤 優太, 小川 和久, 富田 章久, 映像情報メディア学会技術報告 = ITE technical report, 41, 5, 153, 156, Feb. 2017
    映像情報メディア学会, Japanese
  • Characterization of multiplexing technique using virtual phase conjugation for high density holographic memory
    後藤 優太, 岡本 淳, 小川 和久, 富田 章久, 映像情報メディア学会技術報告 = ITE technical report, 41, 5, 147, 152, Feb. 2017
    映像情報メディア学会, Japanese
  • Basic Operation Simulation of Novel 3D Display Based on High-speed Analysis Method for Volume Hologram
    舟越 久敏, 岡本 淳, 渋川 敦史, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 458, 309, 313, 22 Feb. 2016
    電子情報通信学会, Japanese
  • Virtual interferogram-generation algorithm for high-accurate phase measurement using only two holograms
    野澤 仁, 岡本 淳, 小川 和久, 富田 章久, 映像情報メディア学会技術報告 = ITE technical report, 40, 6, 303, 307, Feb. 2016
    映像情報メディア学会, Japanese
  • プログレッシブ位相共役技術による空間モードの選択的抽出
    佐久間大樹, 岡本淳, 小田友和, 後藤優太, 野澤仁, 富田章久, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 63rd, 2016
  • C-3-34 Complex-amplitude Control Using Lens-less Type Spatial Cross Modulation Method
    Kan Yuta, Okamoto Atsushi, Shibukawa Atsushi, Funakoshi Hisatoshi, Sakuma Hiroki, Tomita Akihisa, Proceedings of the Society Conference of IEICE, 2015, 1, 108, 108, 25 Aug. 2015
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • B-10-33 Reduction of Modal Crosstalk using Random Diffuser for Spatial Mode Conversion with Spatial Light Modulator
    Ishii Koki, Okamoto Atsushi, Tsuritani Takehiro, Wakayama Yuta, Goto Yuta, Tomita Akihisa, Proceedings of the Society Conference of IEICE, 2015, 2, 197, 197, 25 Aug. 2015
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Dual GPU Acceleration of Compute Engine in Full Motion Simulator for Holographic Memory
    舟越 久敏, 岡本 淳, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 114, 459, 27, 30, 23 Feb. 2015
    電子情報通信学会, Japanese
  • EXPERIMENT ON THREE-DIMENSIONAL DISPLAY USING SPATIAL CROSS MODULATION METHOD WITH AN OPTICAL RANDOM DIFFUSER
    H. Sakuma, A. Okamoto, A. Shibukawa, H. Funakoshi, Y. Goto, Y. Kan, A. Tomita, 2015 20TH MICROOPTICS CONFERENCE (MOC), 9386, 2015
    English
  • Dynamic wavefront compensation of signal beam in optical satellite communication system using phase conjugation technique
    NISHIMAKI Kaori, OKAMOTO Atsushi, SHIBUKAWA Atsushi, TOMITA Akihisa, TAKAYAMA Yoshihisa, IEICE technical report. Circuits and systems, 114, 122, 87, 92, 09 Jul. 2014
    We propose an optical satellite communication system which can dynamically compensate the signal beam wavefront using phase conjugation technique. The proposed system converts the signal beam wavefront into the phase conjugate wavefront using the double phase conjugate mirror formed by the photorefractive materials and communication beams. By using the time reversal wave and wavefront compensation effect produced by the phase conjugate wavefront, the automatic tracking of satellites and the background light reduction can be achieved at the same time. In addition, we consider the application of proposed method for the visible light communication on the ground., The Institute of Electronics, Information and Communication Engineers, English
  • B-10-58 Conversion and Extraction of Spatial Modes in a Multi-mode Fiber using Progressive Phase Conjugation Technique
    Hirasaki Yuki, Okamoto Atsushi, Tomita Akihisa, Maeda Tomohiro, Proceedings of the IEICE General Conference, 2014, 2, 426, 426, 04 Mar. 2014
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • B-10-61 Reconfigurable Spatial Mode Conversion using a Spatial Light Modulator
    Okamoto Atsushi, Hirasaki Yuki, Maeda Tomohiro, Zhao Yanfeng, Tomita Akihisa, Proceedings of the IEICE General Conference, 2014, 2, 429, 429, 04 Mar. 2014
    The Institute of Electronics, Information and Communication Engineers, English
  • Readout Properties of Single Recorded Hologram in Self-Referential Holographic Data Storage
    TAKABAYASHI Masanori, ETO Taisuke, BUNSEN Masatoshi, OKAMOTO Atsushi, OKAMOTO Takashi, IEICE technical report. Magnetic recording, 113, 267, 11, 16, 24 Oct. 2013
    We describe the procedures, principles and properties of self-referential holography (SRH) in which any reference beam is not required to record and readout holograms.To improve the readout quality of SRH, we performed the numerical simulations and investigated the recording and readout properties in detail. As a results, we could successfully achieve the drastically improvement of the readout quality by shifting the focal position and by using oversampled additional pattern., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Performance evaluation of hologram recording/retrieving with phase-shift embedded SQAM datapages
    Umetsu Shuuhei, Bunsen Masatoshi, Takabayashi Masanori, Okamoto Atsushi, Proceedings of the Society Conference of IEICE, 2013, 1, 195, 195, 03 Sep. 2013
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Recording and Reconstruction of 38-Level Spatial Quadrature-Amplitude Modulation Signal in Double-Referential Holographic Memory
    ZUKERAN Keisuke, OKAMOTO Atsushi, TAKABAYASHI Masanori, SHIBUKAWA Atsushi, TOMITA Akihisa, ITE Technical Report, 37, 10, 1, 7, 15 Feb. 2013
    We propose a double-referential holographic memory (DRHM) that can detect phase modulation signal by just entering reference beam into recording medium without additional system for generation and irradiation of the beam to interfere with signal beam. In this technique, by highly-accurate and simplified complex amplitude detection, high multi-level phase modulation signal and spatial quadrature-amplitude modulation (SQAM) signal become available, so it is expected that storage capacity and data transfer rate are greatly increased. In this paper, we describe the basic operation of the DRHM and evaluate multiple recording/reconstruction characteristics by numerical simulation. Besides, the method for furthermore improving reconstruction quality is newly proposed and its effectiveness is demonstrated., The Institute of Image Information and Television Engineers, Japanese
  • Improvement of Success Probability by Repeated Measurements in Entanglement Generation by Communication using Squeezed Light
    松岡 史晃, 富田 章久, 岡本 淳, 量子情報技術研究会資料, 27, 73, 78, 27 Nov. 2012
    量子情報技術時限研究専門委員会, Japanese
  • A Protocol of the Quantum Relay Using Quantum Group Secret Sharing and Distributed Computing
    鈴木 貴士, 富田 章久, 岡本 淳, 量子情報技術研究会資料, 27, 16, 18, 27 Nov. 2012
    量子情報技術時限研究専門委員会, English
  • 2重位相共役鏡を用いた光衛星間通信システムにおける2値位相板による背景光低減手法
    西牧可織, 岡本淳, 富田章久, 若山雄太, 高山佳久, 電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 2012, ROMBUNNO.24, 20 Oct. 2012
    Japanese
  • A-7-12 Quantum relay method using group secret sharing with quantum states
    Suzuki Takashi, Tomita Akihisa, Okamoto Atushi, Proceedings of the IEICE General Conference, 2012, 180, 180, 06 Mar. 2012
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Acquisition and tracking in inter-satellite communication with dynamically reconfigurable optical device(JC-SAT 2011)
    Nishimaki Kaori, Okamoto Atsushi, Wakayama Yuta, Tomita Akihisa, Takayama Yoshihisa, Technical report of IEICE. SAT, 111, 336, 137, 140, 05 Dec. 2011
    We propose an innovative acquisition and tracking system using a dynamically reconfigurable optical device for optical inter-satellite communication without growing in size and complications due to directivity control of laser beams. The proposed system provides relaxation of acquisition accuracy and suppression of beam divergence by utilization of phase conjugation to form an inter-satellite communication link. This paper reports on the temporal and spatial characteristics of our system for various incident beam angles to consider relaxation of acquisition accuracy and tracking speed., The Institute of Electronics, Information and Communication Engineers, English
  • BCI-1-7 Spatial mode excitation and separation for mode division multiplexing technology
    Okamoto Atsushi, Soma Daiki, Oda Takuya, Tomita Akihisa, Wakayama Yuta, Proceedings of the Society Conference of IEICE, 2011, 1, "SS, 39"-"SS-40", 30 Aug. 2011
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • B-10-34 Holographic wavelength filter with ultra-broad tuning range for reconfigurable optical add-drop multiplexer
    Wakayama Yuta, Okamoto Atsushi, Tomita Akihisa, Proceedings of the Society Conference of IEICE, 2011, 2, 247, 247, 30 Aug. 2011
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • B-10-35 Recording and Reconstruction of LP Modes in Volume Holographic Mode Multiplexer
    Aoki Kohei, Okamoto Atsushi, Tomita Akihisa, Honma Satoshi, Proceedings of the Society Conference of IEICE, 2011, 2, 248, 248, 30 Aug. 2011
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • B-10-36 Experiment on LP Modes Excitation with Multi-mode Fiber for Mode Division Multiplex Communication
    Soma Daiki, Okamoto Atsushi, Oda Takuya, Tomita Akihisa, Sato Kunihiro, Proceedings of the Society Conference of IEICE, 2011, 2, 249, 249, 30 Aug. 2011
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Analysis of LP Mode Separation on All-optical Demultiplexer with Dynamic Multiple Holograms for Mode Division Multiplexing Communication
    ODA Takuya, OKAMOTO Atsushi, SOMA Daiki, TOMITA Akihisa, Technical report of IEICE. LQE, 111, 186, 75, 80, 18 Aug. 2011
    This study aims at the realization of mode division multiplexing (MDM) communication using multi-mode fiber by all-optical mode demultiplexer consisted of the dynamic multiple holograms. In this paper, we consider the separation of three multiplexed MDM signals, and investigate a mode separation characteristic for six combinations composed of three LP modes. In addition, to improve the separation performance of the all-optical mode demultiplexer, we clarify the dependence of the mode separation on the intensity ratio by varying of the two light intensities used in the hologram recording. Moreover, we show that the signal-to-noise ratio is greatly improved by choosing the combination of LP modes and intensity ratio adequately., The Institute of Electronics, Information and Communication Engineers, Japanese
  • B-10-98 Ultra-broad tuning range of reconfigurable optical add-drop multiplexer using dynamic holographic diffraction grating
    Wakayama Yuta, Okamoto Atsushi, Tomita Akihisa, Proceedings of the IEICE General Conference, 2011, 2, 407, 407, 28 Feb. 2011
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • B-10-58 Experiment on Separating of LP Modes with Dynamic Multiplex Holographic Element for Mode Division Multiplex Communication
    Soma Daiki, Okamoto Atsushi, Oda Takuya, Tomita Akihisa, Proceedings of the IEICE General Conference, 2011, 2, 367, 367, 28 Feb. 2011
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Strongly confined light in a singe mode near quantum dots embedded in photonic crystals
    Hiroyuki Nihei, Atsushi Okamoto, Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD, 139, 140, 2011
    English
  • Apodization along thickness direction of holographic transmission grating in Sb-doped Sn2P2S6
    Y. Wakayama, A. Okamoto, A. Tomita, A. A. Grabar, K. Sato, H. Nihei, Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD, 41, 42, 2011
    English
  • Double‐Referential Collinear Holographic Memory and Spatial Quadrature Amplitude Modulation　　　　　　　　　　　　　　　
    Technical Digest of The Joint International Symposium on Optical Memory and Optical Data Storage 2011 (ISOM/ODS’11), OTuD12, 2011
  • Holographic Diversity Detection of Spatial Quadrature Amplitude Modulation Signal for Dual‐Stage Holographic Memory　　　　　　　　　　　　　　　
    Technical Digest of The Joint International Symposium on Optical Memory and Optical Data Storage 2011 (ISOM/ODS’11), OMB3, 2011
  • Evaluation of the Performance in Multilayer Collinear Holographic Memory with Movable Random Phase Mask　　　　　　　　　　　　　　　
    Technical Digest of The Joint International Symposium on Optical Memory and Optical Data Storage 2011 (ISOM/ODS’11), OMD16, 2011
  • Self‐Referential Holographic Data Storage by Phase‐Modulation Technique　　　　　　　　　　　　　　　
    Technical Digest of The Joint International Symposium on Optical Memory and Optical Data Storage 2011 (ISOM/ODS’11), OMB4, 2011
  • High‐Speed Full Motion Analysis Based on FFT-BPM for Collinear Holographic Memory　　　　　　　　　　　　　　　
    Technical Digest of The Joint International Symposium on Optical Memory and Optical Data Storage 2011 (ISOM/ODS’11), OMD22, 2011
  • B-10-52 Experiment on All-optical Demultiplexer for Mode Division Multiplex Communication Technique
    Oda Takuya, Okamoto Atsushi, Morita Kazuyuki, Proceedings of the IEICE General Conference, 2010, 2, 390, 390, 02 Mar. 2010
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • BI-8-2 High Performance Intersatellite Communication based on Double Phase Conjugation Technology
    Okamoto Atsushi, Fujita Tomohiro, Wakayama Yuta, Takayama Yoshihisa, Proceedings of the IEICE General Conference, 2010, 1, "SS, 87"-"SS-88", 02 Mar. 2010
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • All-optical Demultiplexer for mode division multiplex communication technique with a multimode optical fiber
    OKAMOTO ATSUSHI, ODA TAKUYA, MORITA KAZUYUKI, Tech Dig Int Conf Opt photonics Des Fabr, 7th, 169, 170, 2010, [Peer-reviewed]
    English
  • Spatial Arrangement of Speckle-multiplexed Holograms using Directional Control of Shift Selectivity with Holographic Diffuser
    Shuji Takahashi, Masatoshi Bunsen, Hirosuke Furuta, Atsushi Okamoto, TENCON 2010: 2010 IEEE REGION 10 CONFERENCE, 1625, 1628, 2010
    English
  • Spatial Quadrature Amplitude Modulation Method by Dual-Stage Holographic Memory
    OKAMOTO A., International Workshop on Holographic Memories and Display 2010, Nov., 49, 50, 2010
  • Dual-Stage Holographic Memory based on Optical Recording and Digital Readout Technique　　　　　　　　　　　　　　　
    Technical Digest of MOC 2010(CD-ROM), WP62, 2010
  • Experiment on Separating of LP modes by Dynamic Multiplex Holographic Element for Mode Division Multiplex Communication
    SOMA D., MOC'10, Hsinchu, Taiwan, Oct., WB2, 2010
  • High Performance Intersatellite Communication Based on Background Light Reduction Technique with Double Phase Conjugate Mirror　　　　　　　　　　　　　　　
    Technical Digest of MOC 2010(CD-ROM), WP44, 2010
  • Experiment on Photorefractive Collinear Holographic Data Storage by Semicircular Phase-Shift Methods　　　　　　　　　　　　　　　
    Technical Digest of IWHM&D 2010, 53, 2010
  • Low Inter-page Crosstalk Recording by Multi-layer Collinear Holographic Memory　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2010(CD-ROM), Th-N-03, 2010
  • Symbol Error Rate Characteristics of Hybrid-Modulated Holographic Data Storage with Multi-Phase and 2/4 Intensity Modulation Code　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2010(CD-ROM), Th-N-02, 2010
  • Demonstration of Optical Threshold Secret Sharing Scheme with Secure Holographic Memory and Mutually Pumped Phase Conjugator　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2010(CD-ROM), Mo-E-03, 2010
  • Full Motion Analysis for Holographic Memory by Three-Dimensional Fast Fourier Transform Beam-Propagation Method　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2010(CD-ROM), Tu-I-14, 2010
  • Low-loss Coherent of Light Confined Near a Defect in Photonic Crystal　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2010(CD-ROM), Mo-B-04, 2010
  • Targeted optical control of confined light inside photonic crystals　　　　　　　　　　　　　　　
    The proceedings of the Fourth International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (Metamaterials 2010), 16, 2010
  • Photorefractive Collinear Holographic Data Storage by Phase Shift Recording　　　　　　　　　　　　　　　
    Fourth International Conference on Optical, Optelectronic and Photonic Materials and Applications (ICOOPMA 2010), A-0082, 2010
  • All-Optical Reconfigurable Add-Drop Multiplexer with Photorefractive Sn2P2S6:Sb Crystal　　　　　　　　　　　　　　　
    Fourth International Conference on Optical, Optelectronic and Photonic Materials and Applications (ICOOPMA 2010), A-0080, 2010
  • Experiment on Dynamic Reconfigurable Diffraction Element for Mode Division Multiplex Communication
    A. Okamoto, D. Soma, Y. Wakayama, A. Tomita, K. Sato, A. A. Grabar, 2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), 302, +, 2010
    English
  • Improvement of Diffraction Efficiency for All-Optical Tunable Wavelength Filter by Apodized Photorefractive Grating
    Y. Wakayama, A. Okamoto, A. Tomita, H. Nihei, S. Honma, K. Suzuki, 2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), 692, +, 2010
    English
  • Compatibility to WDM of Volume Holographic Demultiplexer for Spatial Mode Division Multiplexing
    K. Morita, A. Okamoto, A. Tomita, M. Takabayashi, M. Bunsen, 2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), 252, +, 2010
    English
  • Polarization Dependence of Double Phase Conjugate Mirror with Sn2P2S6:Sb 1.5% Crystals　　　　　　　　　　　　　　　
    Abstract Book of the 10th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity (RCBJSF-10), 193, 2010
  • Mode division multiplex communication technique based on dynamic volume hologram and phase conjugation
    Atsushi Okamoto, Kazuyuki Morita, Yuta Wakayama, Junya Tanaka, Kunihiro Sato, MICRO-OPTICS 2010, 7716, 771627, 2010
    English
  • All-optical Demultiplexer for mode division multiplex communication technique with a multimode optical fiber　　　　　　　　　　　　　　　
    Technical Digest of 7th International Conference on Optics-photonics Design & Fabrication (ODF’10), 20PSa-57, 2010
  • Polarization Alignment Free Interconnection by Dynamically Reconfigurable Double Phase Conjugation　　　　　　　　　　　　　　　
    Technical Digest of 7th International Conference on Optics-photonics Design & Fabrication (ODF’10), 20S3-05, 2010
  • C-3-13 Dynamically Reconfigurable Optical Interconnection by Polarization-independent Mutually Pumped Phase-conjugate Mirror
    Wakayama Yuta, Okamoto Atsushi, Grabar Alexander A, Proceedings of the Society Conference of IEICE, 2009, 1, 168, 168, 01 Sep. 2009
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Development of Image-Based Simulation for Holographic Data Storage System by Fast Fourier Transform Beam-Propagation Method
    Junya Tanaka, Atsushi Okamoto, Motoki Kitano, JAPANESE JOURNAL OF APPLIED PHYSICS, 48, 3, 03A028, Mar. 2009
    English
  • Time-Domain Differential Detection of Phase-Modulated Signals for Phase-Only Holographic Data Storage
    Masanori Takabayashi, Atsushi Okamoto, Kunihiro Sato, JAPANESE JOURNAL OF APPLIED PHYSICS, 48, 3, 03A032, Mar. 2009
    English
  • Security Assessment of Two-Wave Encryption
    Motoki Kitano, Atsushi Okamoto, Takayuki Sano, JAPANESE JOURNAL OF APPLIED PHYSICS, 48, 3, 03A036, Mar. 2009
    English
  • Nanophotonic quantum dot embedded in photonic crystals using a coherent control with a high spectrum resolution
    Fumiaki Matsuoka, Hiroyuki Nihei, Atsushi Okamoto, PHOTONIC AND PHONONIC CRYSTAL MATERIALS AND DEVICES IX, 7223, 72231F.1-72231F.8, 2009
    English
  • Photorefractive Time-Domain Differential Detection Method for High-Precision Distinction of Phase-Modulated Signals in Holographic Data Storage
    Masanori Takabayashi, Atsushi Okamoto, ADVANCED OPTICAL CONCEPTS IN QUANTUM COMPUTING, MEMORY, AND COMMUNICATION II, 7225, 72250G.1-72250G.8, 2009
    English
  • Shift selectivity in multi-layered collinear holographic system by medium shift along the thickness direction　　　　　　　　　　　　　　　
    Technical Digest of IWHM&D 2009, 13, 14, 2009
  • Fundamental Experiment on Rewritable Collinear Holographic Data Storage　　　　　　　　　　　　　　　
    Technical Digest of IWHM&D 2009, 35, 36, 2009
  • Dynamically reconfigurable optical device with nanoscale dynamic self-organization in Sn2P2S6 crystal　　　　　　　　　　　　　　　
    Technical Digest of the 7th Asia-Pacific Conference on Near-Field Optics (APNFO-7), 127, 2009
  • Spectrum resolution of a coherent control of Er3+ ions embedded in inverse opal structure　　　　　　　　　　　　　　　
    Technical Digest of the 7th Asia-Pacific Conference on Near-Field Optics (APNFO-7), 128, 2009
  • Apodization method by nonuniform spatial distribution of diffraction gratings for photorefractive wavelength filter　　　　　　　　　　　　　　　
    Asia Communications and Photonics Conference and Exhibition (ACP 2009), WL15, 2009
  • Volume Holographic Demultiplexer for Spatial Mode Division Multiplexing in Optical Fiber Communication　　　　　　　　　　　　　　　
    Asia Communications and Photonics Conference and Exhibition (ACP 2009), WL16, 2009
  • Spatial Filtering System on Optical Intersatellite Communication with Double Phase Conjugate Mirror　　　　　　　　　　　　　　　
    Asia Communications and Photonics Conference and Exhibition (ACP 2009), WL54, 2009
  • Coherent Control of Targeted Quantum Dot in Photonic Crystals for Nanophotonics Devices　　　　　　　　　　　　　　　
    Asia Communications and Photonics Conference and Exhibition (ACP2009), FQ2, 2009
  • Dynamically reconfigurable fiber coupling by polarization-independent double phase-conjugation　　　　　　　　　　　　　　　
    Technical Digest of MOC 2009, 272, 273, 2009
  • Directional control of shift selectivity of speckle-multiplexed holograms for improving repositioning tolerance　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2009, Tu-G-18, 2009
  • Reproducing evaluations of optical threshold secret sharing technique based on two-wave encryption　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2009, Tu-G-33, 2009
  • Phase-oriented simulation for shift-multiplexed holographic data storage system by fast-Fourier transform beam-propagation method　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2009, Tu-G-26, 2009
  • Phase-differential modulation for phase-based holographic data storage with photorefractive time-domain differential detection method　　　　　　　　　　　　　　　
    Technical Digest of ISOM 2009, Tu-G-32, 2009
  • High Speed Phase Detection for Holographic Data Storage by Photorefractive Time-Domain Differential Detection with Sb: Sn2P2S6 Crystal
    M. Takabayashi, A. Okamoto, Y. Kojima, A. A. Grabar, PS: 2009 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING, 174, +, 2009
    English
  • Optical interconnection for multi-wavelength signals with volume holographic router
    Satoshi Honma, Sheng Baw Luog, Shinzo Muto, Atsushi Okamoto, 2009 14TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2009), 442, +, 2009
    English
  • Targeted coherent control inside photonic band gaps for nanophotonics devices
    Hiroyuki Nihei, Fumiaki Matsuoka, Atsushi Okamoto, 2009 14TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2009), 616, +, 2009
    English
  • Dynamically Reconfigurable Optical Waveguides with Sn2P2S6 Crystal for Free Space Optical Wiring
    Kazutaka Hira, Atsushi Okamoto, Yasunori Kojima, Alexander A. Grabar, 2009 14TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2009), 322, +, 2009
    English
  • Spatial resolutions for applying photorefractive polymers to diffractive elements
    Atsushi Okamoto, Kazuhiro Harasaka, Masatoshi Bunsen, Masanori Takabayashi, Shuji Rokutanda, JOURNAL OF MODERN OPTICS, 56, 12, 1323, 1334, 2009
    English
  • Link Budget Analysis for Optical Intersatellite Communication System with Double Phase Conjugate Mirror　　　　　　　　　　　　　　　
    Proceedings of 1st International Conference on Space Optical Systems and Applications (ICSOS), 32, 2009
  • Nanophotonic quantum dot embedded in photonic crystals using a coherent control with a high spectrum resolution
    Fumiaki Matsuoka, Hiroyuki Nihei, Atsushi Okamoto, PHOTONIC AND PHONONIC CRYSTAL MATERIALS AND DEVICES IX, 7223, 72231F1-72231F8, 2009
    English
  • Photorefractive Splicing Device with Double Phase Conjugate Mirror Using Sn2P2S6:Sb Crystal
    Yuta Wakayama, Atsushi Okamoto, Kohei Shimayabu, Yasunori Kojima, Alexander A. Grabar, OPTICAL COMPONENTS AND MATERIALS VI, 7212, 72120Q1-72120Q10, 2009
    English
  • Photorefractive Time-Domain Differential Detection Method for High-Precision Distinction of Phase-Modulated Signals in Holographic Data Storage
    Masanori Takabayashi, Atsushi Okamoto, ADVANCED OPTICAL CONCEPTS IN QUANTUM COMPUTING, MEMORY, AND COMMUNICATION II, 7225, 72250G1-72250G8, 2009
    English
  • High sensitive and efficient photorefractive tunable optical wavelength filter with applied external field
    Katsuhito Suzuki, Atsushi Okamoto, Masanori Takabayashi, Satoshi Honma, OPTICAL COMPONENTS AND MATERIALS VI, 7212, 72120W1-72120W9, 2009
    English
  • Experiments on Double Phase Conjugate Mirror with a Photorefractive Sb:Sn2P2S6 Crystal
    Yasunori Kojima, Atsushi Okamoto, Alexander A. Grabar, Masanori Takabayashi, Kohei Shimayabu, FERROELECTRICS, 378, 121, 128, 2009
    English
  • Coherent control of excited atomic states inside a three-dimensional photonic bandgap
    Journal of Modern Optics, 55, 15, 2391, 2399, 10 Sep. 2008
    English
  • Filtering property of all-optical tunable filter with photorefractive waveguide and suppression of cross-talk
    TSUDA Naoya, HONMA Satoshi, MUTO Shinzo, OKAMOTO Atsushi, IEICE technical report, 108, 192, 133, 137, 28 Aug. 2008
    Development of tunable optical filters has been expected for improvement of data transmission capacitance in optical communications. In this report, we propose a tunable frequency filter with a photorefractive (PR) waveguide. It is able to induce index gratings having arbitrary wavelength by radiation of low power interfering light in the PR materials. The PR waveguide is therefore promising device to be applied to optical filters and switches. We analyze the filtering property such as diffraction efficiency and bandwidth. We consider suppression method of channel crosstalk using PR two-wave mixing., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Targeted Optical Control of an Active Medium Embedded In Photonic Crystals
    Nihei Hiroyuki, Okamoto Atsushi, Jpn J Appl Phys, 47, 7, 5781, 5783, 25 Jul. 2008
    We demonstrate optical control of an active medium, such as a quantum dot or an impurity atom, embedded in three-dimensional photonic crystals. The optical control provides a very high spectral selectivity, which allows us to control confined light near a targeted active medium with a specific resonant frequency. Using such an optical control, even if the other active mediums are embedded nearby, we may selectively control only the targeted active medium, leading to a basic operation of an optical memory on the nanoscale below the light wavelength., INSTITUTE OF PURE AND APPLIED PHYSICS
  • Targeted optical control of an active medium embedded in photonic crystals
    Hiroyuki Nihei, Atsushi Okamoto, Japanese Journal of Applied Physics, 47, 7, 5781, 5783, 18 Jul. 2008
    English
  • Improved holographic recording techniques for data-page rewriting
    Masatoshi Bunsen, Hirosuke Furuta, Kuniaki Aragane, Atsushi Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS, 47, 7, 5977, 5980, Jul. 2008
    English
  • Improved holographic recording techniques for data-page rewriting
    Masatoshi Bunsen, Hirosuke Furuta, Kuniaki Aragane, Atsushi Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS, 47, 7, 5977, 5980, Jul. 2008
    English
  • Targeted optical control of an active medium embedded in photonic crystals
    Hiroyuki Nihei, Atsushi Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS, 47, 7, 5781, 5783, Jul. 2008
    English
  • Image cross-connector using a photorefractive polymer
    Atsushi Okamoto, Kazuhiro Harasaka, Hidenobu Muranaka, Takayuki Sano, Akinori Nishio, JOURNAL OF MODERN OPTICS, 55, 2, 311, 322, 2008
    English
  • High-resolution coherent control of a quantum dot embedded in photonic crystals
    Hiroyuki Nihei, Atsushi Okamoto, 2008 IEEE PHOTONICSGLOBAL@SINGAPORE (IPGC), VOLS 1 AND 2, 261, +, 2008
    English
  • Coherent control of excited atomic states inside a three-dimensional photonic bandgap
    Hiroyuki Nihei, Atsushi Okamoto, JOURNAL OF MODERN OPTICS, 55, 15, 2391, 2399, 2008
    English
  • Optical Intersatellite Communication System with Double Phase Conjugate Mirror
    Kohei Shimayabu, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato, Yusuke Nakayama, 2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC), P.4.05, 2008
    English
  • Analysis of double phase-conjugate mirror using the FD-BPM
    Y. Wakayama, Y. Nakayama, A. Okamoto, Y. Takayama, 2008 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING, 114, +, 2008
    English
  • Nano-photonic switching in a quantum dot embedded in photonic crystals
    F. Matsuoka, H. Nihei, A. Okamoto, 2008 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING, 94, +, 2008
    English
  • Suppression of crosstalk by apodization of photorefractive transmission grating for wavelength filter
    K. Suzuki, H. Yoshida, A. Okamoto, S. Honma, 2008 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING, 88, +, 2008
    English
  • Simulation technique for diffraction efficiency characteristics in holographic data storage system based on FFT-BPM　　　　　　　　　　　　　　　
    Technical Digest of ISOM/ODS 2008, 87, 89, 2008
  • Numerical Simulation of Retrieving Characteristics in Holographic Data Storage by Two-Wave Encryption　　　　　　　　　　　　　　　
    Technical Digest of ISOM/ODS 2008, 90, 92, 2008
  • Spatial Resolution of Phase-Modulated Signal Detection Method using Photorefractive Two-Wave Mixing for Holographic Data Storage System　　　　　　　　　　　　　　　
    Technical Digest of ISOM/ODS 2008, 81, 83, 2008
  • Selective Erasure of Multiplexed Holograms Using Beam Amplification by Mutually Pumped Phase Conjugate Mirror　　　　　　　　　　　　　　　
    Technical Digest of ISOM/ODS 2008, 78, 80, 2008
  • Nanophotonic Active Devices using Tunability of Photonic Band Gap　　　　　　　　　　　　　　　
    ABSTRACT BOOK of Russia/CIS/Baltic/Japan symposium on Ferroelectricity (RCBJSF-9), 64, 64, 2008
  • Double Phase Conjugate Mirror in a Photorefractive Sb:Sn2P2S6 Crystal　　　　　　　　　　　　　　　
    ABSTRACT BOOK of Russia/CIS/Baltic/Japan symposium on Ferroelectricity (RCBJSF-9), 165, 165, 2008
  • Image cross-connector using a photorefractive polymer
    Atsushi Okamoto, Kazuhiro Harasaka, Hidenobu Muranaka, Takayuki Sano, Akinori Nishio, JOURNAL OF MODERN OPTICS, 55, 2, 311, 322, 2008
    English
  • Shift-phase code multiplexing technique for holographic memories and optical interconnection
    Satoshi Honma, Shinzo Muto, Atsushi Okamoto, HOLOGRAPHY AND DIFFRACTIVE OPTICS III, 6832, 68322P, 2008
    English
  • Suppression of crosstalk by apodization of photorefractive transmission grating for wavelength filter
    YOSHIDA Hirofimi, OKAMOTO Atsushi, HONMA Satoshi, IEICE technical report. EMD, 107, 196, 139, 143, 16 Aug. 2007
    We propose the suppression method of the crosstalk by the apodization of photorefractive(PR) transmission gratings for wavelength filter. When two coherent writing beams illuminate a PR crystal, an index grating is induced by PR effect and the asymmetric energy transfer occurs. The crosstalk is suppressed by the apodization of the grating in a PR crystal. In this paper, we analyze the bandwidth of diffracted beam for the writing beam intensity. We also show the optimum writing beam intensity ratio for minimizing the crosstalk. Compared with the case that without apodization, the crosstalk is suppressed by about 4dB under a coupling strength of γL=6.0., The Institute of Electronics, Information and Communication Engineers, Japanese
  • High-speed replication system using photorefractive amplifier for holographic ROMs : Equalization of diffraction efficiency of copy holograms
    TAKAHASHI Nobuhiro, OKAMOTO Atsushi, SANO Takayuki, ITO Terumasa, IEICE technical report. EMD, 107, 196, 133, 137, 16 Aug. 2007
    In order to reduce the replication time of holographic ROMs, we propose a high-speed replication system using a photorefractive amplifier (PRA). Our system enables high-speed replication of holographic ROMs by amplification of rather weak beams diffracted from a master medium with a PRA. We show that our system allows high-speed replication of holographic ROMs, compared with the other copy systems. Our system has the problem that diffraction efficiency of copy holograms at each spot is not equal because gain given by a PRA depends on the incident beam angle. We can equalize diffraction efficiency of copy holograms by adjusting diffraction efficiency of master holograms., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Recording schedule for partially coherent hologram multiplexing in a photorefractive medium
    Applied Optics, 46, 23, 5902, 5911, 10 Aug. 2007
    English
  • All-optical multifunctional logic gates for image information using photorefractive two-wave mixing
    Daisuke Ishikawa, Atsushi Okamoto, Satoshi Honma, Terumasa Ito, Kohei Shimayabu, Kunihiro Sato, Optical Review, 14, 4, 246, 251, Jul. 2007
    English
  • Analysis of diffuser shift margin in spatial spread-spectrum holographic multiplexing
    Terumasa Ito, Atsushi Okamoto, Kunihiro Sato, Optical Review, 14, 4, 219, 223, Jul. 2007
    English
  • Analysis of diffuser shift margin in spatial spread-spectrum holographic multiplexing
    Terumasa Ito, Atsushi Okamoto, Kunihiro Sato, OPTICAL REVIEW, 14, 4, 219, 223, Jul. 2007
    English
  • All-optical multifunctional logic gates for image information using Photorefractive two-wave mixing
    Daisuke Ishikawa, Atsushi Okamoto, Satoshi Honma, Terumasa Ito, Kohei Shimayabu, Kunihiro Sat, OPTICAL REVIEW, 14, 4, 246, 251, Jul. 2007
    English
  • Mutually pumped phase conjugate mirror using cross polarized photorefractive coupling
    Atsushi Okamoto, Satoshi Honma, Shunsuke Uemura, Terumasa Ito, OPTICS AND LASER TECHNOLOGY, 39, 4, 881, 884, Jun. 2007
    English
  • Selective erasure for multiplexed holograms in Photorefractive crystal using phase conjugator
    Takayuki Sano, Atsushi Okamoto, Kunihiro Sato, Masatoshi Bunsen, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46, 6B, 3822, 3827, Jun. 2007
    English
  • Coherent parallel copying of holograms recorded by spatial spread-spectrum multiplexing
    Terumasa Ito, Atsushi Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46, 6B, 3816, 3821, Jun. 2007
    English
  • Selective erasure of holograms in Photorefractive and photopolymer materials for rewritable and secure data storage
    Masatoshi Bunsen, Hirosuke Furuta, Atsushi Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46, 6B, 3858, 3861, Jun. 2007
    English
  • Coherent parallel copying of holograms recorded by spatial spread-spectrum multiplexing
    Terumasa Ito, Atsushi Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46, 6B, 3816, 3821, Jun. 2007
    English
  • Selective erasure of holograms in Photorefractive and photopolymer materials for rewritable and secure data storage
    Masatoshi Bunsen, Hirosuke Furuta, Atsushi Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46, 6B, 3858, 3861, Jun. 2007
    English
  • Mutually pumped phase conjugate mirror using cross polarized photorefractive coupling
    Atsushi Okamoto, Satoshi Honma, Shunsuke Uemura, Terumasa Ito, OPTICS AND LASER TECHNOLOGY, 39, 4, 881, 884, Jun. 2007
    English
  • Nondestructive readout of a photorefractive hologram by phase-conjugate copying in a one-crystal configuration
    Applied Optics, 46, 13, 2443, 2452, 01 May 2007
    English
  • Secure holographic memory by two-wave encryption method with a photorefractive crystal
    Atsushi Okamoto, Akifumi Mita, Hisatoshi Funakoshi, Kiyoshi Moritake, Takayuki Sano, JOURNAL OF MODERN OPTICS, 54, 4, 599, 609, Mar. 2007
    English
  • Secure holographic memory by two-wave encryption method with a photorefractive crystal
    Atsushi Okamoto, Akifumi Mita, Hisatoshi Funakoshi, Kiyoshi Moritake, Takayuki Sano, JOURNAL OF MODERN OPTICS, 54, 4, 599, 609, Mar. 2007
    English
  • Ultralow-loss optical quantum information processing in photonic bandgap devices
    Hiroyuki Nihei, Atsushi Okamoto, PHOTON COUNTING APPLICATIONS, QUANTUM OPTICS, AND QUANTUM CRYPTOGRAPHY, 6583, 656830Q.1-656830Q.8, 2007
    English
  • Quantum information processing using nanoscale objects embedded in photonic crystals
    Hiroyuki Nihei, Atsushi Okamoto, OPTOMECHATRONIC MICRO/NANO DEVICES AND COMPONENTS III, 6717, 671703.1-671703.8, 2007
    English
  • High-speed holographic read-only memory replication systems with two-wave and four-wave photorefractive amplifier
    Terumasa Ito, Atsushi Okamoto, Nobuhiro Takahashi, Takayuki Sano, OPTICAL DATA STORAGE 2007, 6620, 66201B.1-66201B.7, 2007
    English
  • Analysis of composite interpage crosstalk in shift multiplexing　　　　　　　　　　　　　　　
    IWHM 2007 Digests, 1st International Workshop on Holographic Memories 2007, no.26p13, 2007
  • Improvement of holographic recording configuration for data page rewriting　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2007 (ISOM’07), no. We-J-01, 2007
  • Targeted control of a quantum dot in photonic crystals for a nanoscale optical memory　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2007 (ISOM’07), no. We-I P05, 2007
  • Decay Reduction of Multiplexed Holograms on Selective Erasure by Amplified Phase Conjugate Beams　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2007 (ISOM’07), no.We-J-18, 2007
  • Security Improvement by Multiplexing Dummy Data for Optical Random Phase Encryption　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2007 (ISOM’07), no.We-J-21, 2007
  • Improvement in copying speed and diffraction efficiency of holographic ROMs by photorefractive amplification and coherent parallel copying　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2007 (ISOM’07), no.Th-K-08, 2007
  • Noise reduction strategy in high-speed replication of holographic memories using photorefractive amplification
    Nobuhiro Takahashi, Atsushi Okamoto, Takayuki Sano, Terumasa Ito, 2007 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1-4, 609, 610, 2007
    English
  • Intrapage crosstalk in one-beam holographic recording system using a blazed grating
    Joji Sasaki, Atsushi Okamoto, Terumasa Ito, Eiji Nakagawa, Toshio Ando, Hiroshi Umehara, 2007 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1-4, 425, +, 2007
    English
  • Time-domain differential detection using photorefractive two-wave mixing in phase-only holographic data storage system
    Masanori Takabayashi, Atsushi Okamoto, Terumasa Ito, 2007 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1-4, 607, 608, 2007
    English
  • Recording schedule for partially-coherent hologram multiplexing in a photorefractive medium
    ITO Terumasa, OKAMOTO Atsushi, SATO Kunihiro, Applied Optics, 46, 23, 5902, 5911, 2007
  • All-optical tunable wavelength filter using photorefractive material　　　　　　　　　　　　　　　
    Technical Digest of 12th Optoelectronics and Communications Conference (OECC2007), no.10E1-4, 2007
  • Apodization of photorefractive transmission grating for wavelength filter　　　　　　　　　　　　　　　
    Technical Digest of 12th Optoelectronics and Communications Conference (OECC2007), no.12E2-5, 2007
  • All-optical interconnection for two-dimensional data using photorefractive organic film　　　　　　　　　　　　　　　
    Technical Digest of 12th Optoelectronics and Communications Conference (OECC2007), no.11P-32, 2007
  • Optical Parallel Interconnects Using Organic Photorefractive Polymer　　　　　　　　　　　　　　　
    Technical Digest of 12th Optoelectronics and Communications Conference (OECC2007), no.11P-34, 2007
  • Nondestructive readout of a photorefractive hologram using phase-conjugate copying in a one-crystal configuration
    ITO Terumasa, OKAMOTO Atsushi, FUNAKOSHI Hisatoshi, SATO Kunihiro, Applied Optics, 46, 13, 2443, 2452, 2007
  • High-speed holographic read-only memory replication systems with two-wave and four-wave photorefractive amplifier
    Terumasa Ito, Atsushi Okamoto, Nobuhiro Takahashi, Takayuki Sano, OPTICAL DATA STORAGE 2007, 6620, no.TuD2, 2007
    English
  • Efficient coupling for bidirectional pumping in EDFA with two mutually-pumped phase-conjugate mirrors
    Shugo Kano, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato, NONLINEAR OPTICS AND APPLICATIONS II, 6582, 65821U1-65821U9, 2007
    English
  • Tunable optical filter for wavelength division multiplexing using photorefractive planar waveguide
    Satoshi Honma, Hirokazu Ito, Mitsuhiro Komatsu, Shinzo Muto, Atsushi Okamoto, NONLINEAR OPTICS AND APPLICATIONS II, 6582, 65821S1-65821S9, 2007
    English
  • Splice of photonic crystal fibres by use of double phase-conjugate mirror
    Yusuke Nakayama, Atsushi Okamoto, Yoshihisa Takayama, Yutaka Hayano, PHOTONIC CRYSTAL FIBERS, 6588, 6588131, 6588138, 2007
    English
  • Experiment on long-term readout of binarized image in photorefractive memory with double mutually pumped phase conjugators
    Optics & Laser Technology, 38, 8, 604, 613, Nov. 2006
    English
  • Experiment on long-term readout of binarized image in photorefractive memory with double mutually pumped phase conjugators
    H Funakoshi, A Okamoto, OPTICS AND LASER TECHNOLOGY, 38, 8, 604, 613, Nov. 2006
    English
  • Selective erasure of speckle-multiplexed holograms by use of a double Mach-Zehnder interferometric arrangement
    Applied Optics, 45, 27, 7035, 7042, 20 Sep. 2006
    English
  • Volume holographic recording using spatial spread-spectrum multiplexing
    T Ito, A Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 45, 2B, 1270, 1276, Feb. 2006
    English
  • Volume holographic recording using spatial spread-spectrum multiplexing
    T Ito, A Okamoto, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 45, 2B, 1270, 1276, Feb. 2006
    English
  • All-optical XOR-, OR-, and AND-gates using Photorefractive Two-Wave Mixing
    5th, 213, 214, 2006
    English
  • Coherent control of excited atomic states inside a photonic band gap
    Hiroyuki Nihei, Atsushi Okamoto, PHOTONIC CRYSTAL MATERIALS AND DEVICES III (I.E. V), 6182, 61821B.1-61821B.8, 2006
    English
  • Shift Margin of a Random Diffuser in Spatial Spread-Spectrum Multiplexing
    5th, 187, 188, 2006
    English
  • All-optical XOR-, OR-, and AND-Gates using Photorefractive Two-Wave Mixing　　　　　　　　　　　　　　　
    5th International Conference of Optics-photonics Design & Fabrication (ODF’06) Technical Digest, no. 7PS4-04, 2006
  • Shift margin of a random diffuser in spatial spread-spectrum multiplexing　　　　　　　　　　　　　　　
    5th International Conference of Optics-photonics Design & Fabrication (ODF’06) Technical Digest, no.7PS3-06, 2006
  • Selective erasure of photorefractive and photopolymer holograms for rewriteable and secure data storage　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2006 (ISOM 2006), no.Th-I-43, 2006
  • Elimination of edge enhancement on hologram refresh system using two photorefractive crystals　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2006 (ISOM 2006), no.Th-I-30, 2006
  • Reduction of decay of multiplexed holograms in selective erasure using phase conjugate mirror　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2006 (ISOM 2006), no.Th-I-31, 2006
  • One-beam holographic recording using a blazed grating　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2006 (ISOM 2006), no.Th-I-45, 2006
  • Coherent parallel copying of holographic recorded by spatial spread-spectrum multiplexing
    ITO T., Tech. Dig. ISOM2006, no.Mo-D-07, 2006
  • Shift-phase code multiplexing technique for holographic memory　　　　　　　　　　　　　　　
    Technical Digest of International Symposium on Optical Memory 2006 (ISOM 2006), no.Th-I-44, 2006
  • Selective erasure of speckle-multiplexed holograms by use of a double Mach-Zehnder interferometric arrangement
    BUNSEN Masatoshi, FURUTA Hirosuke, OKAMOTO Atsushi, Applied Optics, 45, 27, 7035, 7042, 2006
  • Estimation of crosstalk in holographic optical interconnection with shift-phase code multiplexing　　　　　　　　　　　　　　　
    Technical Digest of 11th Optoelectronics and Communications Conference (OECC2006), no.5E3-2, 2006
  • Optical interconnection with photorefractive connection module by using polymeric material　　　　　　　　　　　　　　　
    Technical Digest of 11th Optoelectronics and Communications Conference (OECC2006), no.4P-8, 2006
  • All-optical logic gates using photorefractive two-wave mixing for two-dimensional information processing　　　　　　　　　　　　　　　
    Technical Digest of 11th Optoelectronics and Communications Conference (OECC2006), no.6B2-3, 2006
  • Ultra low-less coherent control of excited atomic states in photonic bandgap　　　　　　　　　　　　　　　
    Technical Digest of 11th Optoelectronics and Communications Conference (OECC2006), Post Deadline Paper, 2006
  • Coherent control of excited atomic states inside a photonic band gap
    Hiroyuki Nihei, Atsushi Okamoto, PHOTONIC CRYSTAL MATERIALS AND DEVICES III (I.E. V), 6182, 61821B, 2006
    English
  • Efficient pump beam coupling in EDFA with two Mutually Pumped Phase Conjugate Mirrors
    Shugo Kano, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato, Hideyuki Kaseda, RELIABILITY OF OPTICAL FIBER COMPONENTS, DEVICES, SYSTEMS, AND NETWORKS III, 6193, 61930F, 2006
    English
  • Optical intersatellite data transmission with phase conjugate mirror for formation flying
    Tatsuya Shiratori, Atsushi Okamoto, Yoshihisa Takayama, Terumasa Ito, PHOTON MANAGEMENT II, 6187, U418, U425, 2006
    English
  • Fault tolerant function of dynamic refreshing holographic memory with shutter-less optical feedback circuit
    A Okamoto, T Ito, M Bunsen, Y Takayama, JOURNAL OF MODERN OPTICS, 52, 17, 2453, 2465, Nov. 2005
    English
  • A-7-14 Security enhancement by dummy data multiplexing for optical encryption method using random phase code
    Moritake Kiyoshi, Okamoto Atushi, Sano Takayuki, Proceedings of the Society Conference of IEICE, 2005, 187, 187, 07 Sep. 2005
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • C-3-47 Encryption method with photorefractive inverse filter
    Honma Satoshi, Higuchi Tomomi, Muto Shinzo, Okamoto Atsushi, Proceedings of the Society Conference of IEICE, 2005, 1, 191, 191, 07 Sep. 2005
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • C-13-1 Image Cross Connecter with Photorefractive Polymer
    Muranaka Hidenobu, Okamoto Atsushi, Bunsen Masatoshi, Yamamoto Michiharu, Proceedings of the Society Conference of IEICE, 2005, 2, 123, 123, 07 Sep. 2005
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Suppression of Fanning Noise for Holographic Memory with Refresh System
    ISHII Hiroyuki, OKAMOTO Atsushi, ITO Terumasa, Technical report of IEICE. LQE, 105, 251, 31, 34, 19 Aug. 2005
    Holographic memory with the refresh system using two photorefractive crystals is expected to realize Holographic Random Access Memory(RAM). However, in this method, it is necessary to defeat fanning noise that is main cause of degradation of output signal and decrease in SNR. We propose a new optical noise filter system using a random phase diffuser, which can be used in holographic refresh systems to obtain high quality output signal and achieve higher SNR, by suppression of fanning noise between the two crystals., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Efficient Coupling of Pump Beam using Two Mutually Phase conjugate Minors in EDFA
    KASEDA Hideyuki, OKAMOTO Atsushi, TAKAYAMA Yoshihisa, Technical report of IEICE. LQE, 105, 251, 45, 50, 19 Aug. 2005
    We propose a new method to coupled a pump beam to a fiber using two mutually phase conjugate mirrors (MPPCMs). According to characteristic of MPPCM, a pump beam is coupled to a fiber as the phase conjugate beam of the beam from the fiber. Therefore, we can obtain high coupling efficiency without the processing technique and precision adjustment. The coupling efficiency in this method depends on the intensity ration of two incident beam in the photorefractive crystal. We analyze the coupling efficiency for the ratio of two pump beams, and then show the optimum ratio of two pump beams, The Institute of Electronics, Information and Communication Engineers, Japanese
  • Long-term reading experiment on a photorefractive holographic memory with the hologram sustainment technique by optical feedback
    H Funakoshi, A Okamoto, K Sato, JOURNAL OF MODERN OPTICS, 52, 11, 1511, 1527, Jul. 2005
    English
  • Mutually pumped phase conjugate mirror with cross-polarized beams and all-optical bus system
    HONMA Satoshi, KISHIHARA Syunsuke, OKAMOTO Atsushi, MUTO Shinzo, Technical report of IEICE. OCS, 105, 120, 1, 6, 10 Jun. 2005
    We propose a mutually pumped phase conjugate mirror (MPPCM) with cross-polarized beams. The incident beams and the generated phase conjugation beams are orthogonal polarized each other, and the optical passes are efficiently divided by using a polarized beam splitter. Therefore it is possible to suppress the energy loss of the beams compared with conventional MPPCM with parallel-polarized beams. We investigate the coupling strength threshold for buildup of the cross-polarized MPPCM and the optimum intensity ratio of the incident beams. Comparison of the numerical analysis with a basic experiment is given. A qualitative agreement is exhibited. In the end, we suggest the application of the CP-MPPCM to an all-optical bus system., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Theoretical and experimental studies of hologram multiplexing that uses a random wave front generated by photorefractive beam fanning.
    Applied Optics, 44, 8, 1454, 1463, 10 Mar. 2005
    English
  • COHERENT CONTROL OF A QUBIT EMBEDDED IN PHOTONIC CRYSTALS USING A DARK LINE IN EMISSION SPECTRA
    13, 17, 20, Mar. 2005
    English
  • Improvement of coupling efficiency between pump light source and fiber in EDFA using mutually pumped phase conjugate mirrors
    H Kaseda, A Okamoto, Y Takayama, H Kato, 2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, 2005, 803, 804, 2005
    English
  • Experiment on all-optical bi-directional interconnection with double mutual-pumped phase conjugate mirrors
    S Hondo, A Okamoto, K Sato, S Honma, OPTOELECTRONIC DEVICES AND INTEGRATION, PTS 1 AND 2, 5644, Pt.2, 549, 556, 2005
    English
  • Photorefractive bi-directional connection module with mutual-pumped phase conjugate mirror
    Kazumasa Kori, Atsushi Okamoto, Yoshihisa Takayama, Masatoshi Bunsen, Hisatoshi Funakoshi, Terumasa Ito, Proceedings of SPIE - The International Society for Optical Engineering, 5642, 487, 496, 2005
    English
  • Optical controlled matrix switch and free-space optical interconnection by photorefractive polymers
    Atsushi Okamoto, Hisatoshi Funakoshi, Masatoshi Bunsen, Akinori Nishio, Proceedings of SPIE - The International Society for Optical Engineering, 5642, 599, 608, 2005
    English
  • Experiment on signal extraction in photorefractive connection module with organic polymer PATPD
    Kazuhiro Harasaka, Atsushi Okamoto, Masatoshi Bunsen, Michiharu Yamamoto, Proceedings of SPIE - The International Society for Optical Engineering, 6050, 60500V.1-60500V.8, 2005
    English
  • Shift selectivity of spatial spread-spectrum holographic recording system
    Terumasa Ito, Atsushi Okamoto, Masatoshi Bunsen, Proceedings of SPIE - The International Society for Optical Engineering, 6050, 605009.1-605009.8, 2005
    English
  • Selective erasure for multiplexed holograms in photorefractive crystal using phase conjugate mirror
    Takayuki Sano, Atsushi Okamoto, Kunihiro Sato, Masatoshi Bunsen, Proceedings of SPIE - The International Society for Optical Engineering, 6050, 60500X.1-60500X.8, 2005
    English
  • Optimization of Incident Beam Intensities for Mutually Pumped Four-Wave Mixing and Multi-Valued Property of Phase Conjugation
    HONMA Satoshi, AMANO Takashi, UEMURA Syunsuke, FUNAKOSHI Hisatoshi, OKAMOTO Atsushi, MUTO Shinzo, The IEICE transactions on electronics C, Vol.J88-C, 2, 91, 98, 2005
    位相共役光学を応用した光デバイスの開発が盛んに行われており, 位相共役光の高効率かつ簡便な発生方法が求められている.我々はこれまでに相互励起型位相共役鏡と縮退4波混合を組み合わせた相互励起型4波混合を新たに提案した.本手法では互いに波面が一致しかつ対向に伝搬する理想的なポンプ光を自動的に作り出せるので, 入射する光の波面及び角度を微調整する必要はなく, 簡便に位相共役光を発生させることができる.その実験的検証に加えて, 相互励起型位相共役鏡のみを用いた場合よりも位相共役光の立上りが早くなることを示した.しかし, これまでに相互励起型4波混合の理論的な検討が行われていない.本論文では, 位相共役光発生の高効率化を図る目的から, フォトリフラクティブ相互励起型4波混合の二つの相互作用領域における結合強度を考慮に入れた位相共役変換効率を解析し, それぞれの結合強度に応じた最適な入射条件について検討を行う.また, 媒質の効率が高い場合に位相共役変換効率に複数の解が出現することを示し, その発生条件について検討を行う., The Institute of Electronics, Information and Communication Engineers, Japanese
  • 「相互励起型位相共役鏡による揮発性ホログラムの全光学的維持手法」　　　　　　　　　　　　　　　
    電子情報通信学会論文誌, Vol.J88-C, 4, 286, 289, 2005
  • Ito, T., Okamoto, A. and Bunsen, M.: “Shift selectivity of spatial spread-spectrum holographic recording system”, Proceedings of. SPIE(ISOT2005), Vol.6050-09(2005)＊*　　　　　　　　　　　　　　　
    2005
  • 「フォトニック結晶に埋め込まれた原子のラビ振動」　　　　　　　　　　　　　　　
    電子情報通信学会論文誌, Vol.J88-C, 11, 998, 999, 2005
  • Kaseda, H., Okamoto, A., Y. Takayama and Kato, H.: “Improvement of Coupling Efficiency between Pump Light Source and Fiber in EDFA using Mutually Pumped Phase Conjugate Mirrors”, Technical Digest of International Quantum Electronics Conference and the ・・・　　　　　　　　　　　　　　　
    2005
    Kaseda, H., Okamoto, A., Y. Takayama and Kato, H.: “Improvement of Coupling Efficiency between Pump Light Source and Fiber in EDFA using Mutually Pumped Phase Conjugate Mirrors”, Technical Digest of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers and Elector-Optics 2005 (IQEC and CLEO-PR2005), no. CThC3-P19(2005)＊*
  • Harasaka, K., Okamoto, A., Bunsen, M. and Yamamoto, M.: “Photorefractive Connection Module with Organic Photorefractive Polymer PATPD”, Technical Digest of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers and Electo・・・　　　　　　　　　　　　　　　
    2005
    Harasaka, K., Okamoto, A., Bunsen, M. and Yamamoto, M.: “Photorefractive Connection Module with Organic Photorefractive Polymer PATPD”, Technical Digest of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers and Elector-Optics 2005 (IQEC and CLEO-PR2005), no.CthC3-P21(2005)＊*
  • Muranaka, H., Okamoto, A., Uemura, S., Bunsen, M., and Nishio, A.: “Optical Image Cross Connector with Multiple-layered Photorefractive Polymers”, Technical Digest of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers・・・　　　　　　　　　　　　　　　
    2005
    Muranaka, H., Okamoto, A., Uemura, S., Bunsen, M., and Nishio, A.: “Optical Image Cross Connector with Multiple-layered Photorefractive Polymers”, Technical Digest of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers and Elector-Optics 2005 (IQEC and CLEO-PR2005), no.CThC3-P20(2005)＊*
  • Nihei, H. and Okamoto, A.: “Coherent control of a qubit embedded in photonic crystals using a dark line in emission spectra”, Proceedings of 12th European Conference on Integrated Optics (ECIO’05) , pp.598 (2005)＊*　　　　　　　　　　　　　　　
    2005
  • Sano, T., Okamoto, A., Sato, K. and Bunsen, M.: “Selective erasure for multiplexed holograms by using photorefractive phase-shift”, The European Conference on Lasers and Electro-Optics (CLEO Europe 2005), CC-2-WED (2005)＊*　　　　　　　　　　　　　　　
    2005
  • Ito, T. and Okamoto, A.: “Spatial spread-spectrum multiplexing for holographic data storage using random diffuser and circular spatial filter”, The European Conference on Lasers and Electro-Optics (CLEO Europe 2005), CC1-4-TUE(2005)＊*　　　　　　　　　　　　　　　
    2005
  • Harasaka, K., Okamoto, A., Bunsen, M., and Yamamoto, M.: “Experiment on signal extraction in photorefractive connection module with organic polymer PATPD”, Proceedings of. SPIE(ISOT2005), Vol. 6050-0V(2005)＊*　　　　　　　　　　　　　　　
    2005
  • Moritake, K., Okamoto, A., Funakoshi, H. and Ito, T.: “Security improvement with multiplexing for optical encryption based on cross-correlation of random phase masks”, Technical Digest of International Quantum Electronics Conference and the Pacific Ri・・・　　　　　　　　　　　　　　　
    2005
    Moritake, K., Okamoto, A., Funakoshi, H. and Ito, T.: “Security improvement with multiplexing for optical encryption based on cross-correlation of random phase masks”, Technical Digest of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers and Elector-Optics 2005 (IQEC and CLEO-PR2005), no.CTuN1-2(2005)＊*
  • Sano, T., Okamoto, A., Sato, K. and Bunsen, M.: “Selective erasure for multiplexed holograms in photorefractive crystal using phase conjugate mirror”, Proceedings of SPIE(ISOT2005) vol.6050-0X, (2005)＊*　　　　　　　　　　　　　　　
    2005
  • Okamoto, A., Funakoshi, H., Bunsen, M., Ito, T. and Sato, K.: “Optical security switch based on spatially phase matching in photorefractive media”, The European Conference on Lasers and Electro-Optics (CLEO Europe 2005), CC-2-WED(2005)＊*　　　　　　　　　　　　　　　
    2005
  • Ito, T. and Okamoto, A.: “Volume holographic recording with spatial spread-spectrum multiplexing technique”, Technical Digest of International Symposium on Optical Memory and Optical Data Storage Topical Meeting 2005 (ISOM/ODS2005), no.MP-20(2005)＊*　　　　　　　　　　　　　　　
    2005
  • Nihei, H. and Okamoto, A.: “Optical switching of an atomic system in photonic crystals using a dark line in emission spectra”, Technical Digest of Optoelectronics and Communications Conference (OECC2005), pp. 294-295(2005)＊*　　　　　　　　　　　　　　　
    2005
  • Bunsen, M., Okamoto, A. and Furuta, H.: “A method for selective erasure of multiplexed holograms by use of double Mach-Zehnder interferometer”, Technical Digest of 10th Optoelectronics and Communications Conference (OECC2005), pp.624-625 (2005)＊*　　　　　　　　　　　　　　　
    2005
  • Shiratori, T., Okamoto, A., Kori, K., and Funakoshi, H.: “All-optical Reconfigurable Waveguide with Mutually-pumped Phase Conjugate Mirrors for Free-space Optical Interconnection”, Technical Digest of 10th Optoelectronics and Communications Conference ・・・　　　　　　　　　　　　　　　
    2005
    Shiratori, T., Okamoto, A., Kori, K., and Funakoshi, H.: “All-optical Reconfigurable Waveguide with Mutually-pumped Phase Conjugate Mirrors for Free-space Optical Interconnection”, Technical Digest of 10th Optoelectronics and Communications Conference (OECC2005), no.7P-032(2005)＊*
  • Muranaka, H., Okamoto, A., Uemura, S., Bunsen, M., and Nishio, A.: “Optically Controlled Image Cross Connector with Photorefractive Polymer”, Technical Digest of 10th Optoelectronics and Communications Conference (OECC2005), no.7P-118(2005)＊*　　　　　　　　　　　　　　　
    2005
  • Honma, S., Matsuyama, D., Ito, T., Okamoto, A., and Muto, S.: “Optical interconnection by holographic router and movement with orthogonal phase matrix pattern”, Technical Digest of 10th Optoelectronics and Communications Conference (OECC2005), no.6E4-7・・・　　　　　　　　　　　　　　　
    2005
    Honma, S., Matsuyama, D., Ito, T., Okamoto, A., and Muto, S.: “Optical interconnection by holographic router and movement with orthogonal phase matrix pattern”, Technical Digest of 10th Optoelectronics and Communications Conference (OECC2005), no.6E4-7(2005)＊*
  • Ito, T., Okamoto, A., and Funakoshi, H.: “Static holographic random access memory using two photorefractive crystals”, Technical Digest of 10th Optoelectronics and Communications Conference (OECC2005), no.7P-069(2005)＊*　　　　　　　　　　　　　　　
    2005
  • Kaseda, H., Okamoto, A., Takayama, Y., Kato, H. and Sato, K.: “Effective coupling method between pump light source and fiber in EDFA with one mutually pumped phase conjugate mirror”, Technical Digest of 10th Optoelectronics and Communications Conferenc・・・　　　　　　　　　　　　　　　
    2005
    Kaseda, H., Okamoto, A., Takayama, Y., Kato, H. and Sato, K.: “Effective coupling method between pump light source and fiber in EDFA with one mutually pumped phase conjugate mirror”, Technical Digest of 10th Optoelectronics and Communications Conference (OECC2005), no.7P-055(2005)＊*
  • Okamoto, A., Terumasa Ito, Bunsen, M. and Takayama, Y.: “Fault tolerant function of dynamic refreshing holographic memory with shutter-less optical feedback circuit”, Journal of Modern Optics Vol. 52(17), pp.2453-2465 (2005)＊*　　　　　　　　　　　　　　　
    2005
  • Nihei, H. and Okamoto, A. : “Coherent control of spontaneous emission near a photonic band edge using a dark line in emission spectra”, The European Conference on Lasers and Electro-Optics (CLEO Europe 2005), CK3-4(2005)＊*　　　　　　　　　　　　　　　
    2005
  • Sano, T., Okamoto, A., Sato, K. and Bunsen, M.: “Experiment on selective erasure for multiplexed holograms by using photorefractive phase shift”, Technical Digest of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers ・・・　　　　　　　　　　　　　　　
    2005
    Sano, T., Okamoto, A., Sato, K. and Bunsen, M.: “Experiment on selective erasure for multiplexed holograms by using photorefractive phase shift”, Technical Digest of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers and Elector-Optics 2005 (IQEC and CLEO-PR2005), no.CWAB3-P89(2005)＊*
  • 2-D Image Operation and Its Application to XOR Encryption with Photorefractive Crystal and Double Mach-Zehnder Interferometer
    BUNSEN Masatoshi, OKAMOTO Atsushi, SATO Kunihiro, The transactions of the Institute of Electronics, Information and Communication Engineers. C, vol.J88-C, 1, 72, 73, 2005
    フォトリフラクティブ結晶と二重マッハツェンダ干渉光学系による二次元画像演算を応用し,ホログラフィックメモリ中の記録データを光学的にXOR暗号化する手法を提案する.多重記録された複数のホログラムをそれぞれ独立に暗号化,復号化できることを実験により示す., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Bunsen, M. and Okamoto, A.: “Theoretical and experimental studies of hologram multiplexing that uses a random wave front generated by photorefractive beam fanning”, Applied Optics, Vol.44(8), pp.1454-1463 (2005)＊*　　　　　　　　　　　　　　　
    2005
  • Funakoshi, H., Okamoto, A. and Sato, K.: “Long-term reading experiment on photorefractive holographic memory with hologram sustainment technique by optical feedback”, Journal of Modern Optics, Vol. 52(11), pp. 1511-1527 (2005)＊*　　　　　　　　　　　　　　　
    2005
  • Hologram multiplexing with photorefractive beam-fanning speckle
    M Bunsen, A Okamoto, Y Takayama, OPTICS COMMUNICATIONS, 235, 1-3, 41, 47, May 2004
    English
  • Optical manipulation of multiple stable states in photorefractive four-wave mixing
    Y Takayama, A Okamoto, JOURNAL OF MODERN OPTICS, 51, 2, 197, 208, Jan. 2004
    English
  • Uemura, S., Okamoto, A. and Honma, S.: “All-optical interconnection with cross-polarized double phase conjugate mirror” Proceedings of SPIE, 5350 (Photonics West 2004): 234-242(2004).*　　　　　　　　　　　　　　　
    2004
  • Bunsen, M., Okamoto, A. and Sato, K. :“Photorefractive holographic memory by use of beam-fanning phenomenon in storage crystal” Proceedings of 10th Microoptics Conference (MOC’04), no.F-31:CD-ROM(2004).*　　　　　　　　　　　　　　　
    2004
  • T. Ito, Okamoto, A. and Sato, K. :“Compact dynamic holographic storage system using parallel phase-conjugate refreshment for multiplexed holograms” Proceedings of 10th Microoptics Conference (MOC’04), no.F-32:CD-ROM(2004).*　　　　　　　　　　　　　　　
    2004
  • Okamoto, A., Funakoshi, H., Moritake, K. and Bunsen, M. :“Security measures in optical devices by spatial phase matching in a photorefractive crystal” Proceedings of 10th Microoptics Conference (MOC’04), no.F-38:CD-ROM(2004).*　　　　　　　　　　　　　　　
    2004
  • Nihei, H. and Okamoto, A.:“Optical quantum gate using a qubit embedded in photonic bandgap structures”, 10th Microoptics Conference (MOC), H-3:CD-ROM(2004).*　　　　　　　　　　　　　　　
    2004
  • H. Nihei and Okamoto, A.: “Coherent control of a qubit embedded in photonic bandgap structures with high-speed switching,” Proceedings of 30th European Conference on Optical Communication (ECOC2004), 5:78-79(2004).*　　　　　　　　　　　　　　　
    2004
  • Funakoshi, H., Okamoto, A. and Sato, K.: “Long-term retrieving experiment on rewritable holographic memory with dynamic refreshment by mutual-pumped phase conjugator,” Proceedings of SPIE, 5636-93 (2004).*　　　　　　　　　　　　　　　
    2004
  • Honma, S., Muto, S. and Okamoto, A.: “All-optical interconnection with mutually pumped four-wave mixing and optimization for high-connection efficiency,” Proceedings of SPIE, 5636-108(2004).*　　　　　　　　　　　　　　　
    2004
  • Kori, K., Okamoto, A., Takayama, Y., Bunsen, M., Funakoshi, H. and Ito, T.: “Photorefractive bi-directional connection module with mutual-pumped phase conjugate mirror,” Proceedings of SPIE, 5642-86(2004).*　　　　　　　　　　　　　　　
    2004
  • Ito, T., Okamoto, A. and Funakoshi, H. :“Noise Reduced Refreshment for Dynamic Holographic Memory with Phase Conjugation in a BaTiO3 Crystal,” Proceedings of 9th Optoelectronics and Communications Conference / 3rd International Conference on Optical In・・・　　　　　　　　　　　　　　　
    2004
    Ito, T., Okamoto, A. and Funakoshi, H. :“Noise Reduced Refreshment for Dynamic Holographic Memory with Phase Conjugation in a BaTiO3 Crystal,” Proceedings of 9th Optoelectronics and Communications Conference / 3rd International Conference on Optical Internet (OECC/COIN2004), no.16E2-2: 872-873(2004).*
  • Mita, A., Okamoto, A. and Funakoshi, H.: “Effect of random phase mask on input plane in photorefractive authentic memory with two-wave encryption method,” Proceedings of SPIE, 5362 (Photonics West 2004): 61-68(2004).*　　　　　　　　　　　　　　　
    2004
  • Bunsen, M., Okamoto, A. and Takayama, Y.: “Hologram multiplexing with photorefractive beam-fanning speckle,” Opt. Commun., 235(1-3):41-47(2004).*　　　　　　　　　　　　　　　
    2004
  • 「ホトリフラクティブ相互励起型4波混合」　　　　　　　　　　　　　　　
    電子情報通信学会論文誌C, VOL.J87-C, 3, 350, 351, 2004
  • Nihei, H. and Okamoto, A.: “Spontaneous emission from a three-level atom embedded in anisotropic photonic band gap structures”, Journal of Modern Optics, 51(13):1983-1998 (2004).*　　　　　　　　　　　　　　　
    2004
  • 「2重マッハツェンダ－干渉光学系によるスペックル多重ホログラムの選択的消去・更新手法」　　　　　　　　　　　　　　　
    電子情報通信学会論文誌C, J87-C, 11, 982, 983, 2004
  • Kato, H., Okamoto, A. and Bunsen, M.: “Stabilization of Signal Beam Intensity for Fault-Tolerant Automatic Routing with Double Phase Conjugate Mirrors,” Proceedings of SPIE, 5363 (Photonics West 2004):148-155(2004).*　　　　　　　　　　　　　　　
    2004
  • Yagai, T., Okamoto, A., Bunsen, M.: “All-optical interconnection with photorefractive grating array for wavelength divided multiplexing signal,” Proceedings of SPIE,5350 (Photonics West 2004): 81-88(2004).*　　　　　　　　　　　　　　　
    2004
  • Hondo, S., Okamoto, A. and Honma, S.: “All-optical bidirectional interconnection by light-induced waveguide with double mutual-pumped phase conjugation” Proceedings of SPIE, 5363 (Photonics West 2004): 156-163(2004).*　　　　　　　　　　　　　　　
    2004
  • Funakoshi, H. and Okamoto, A.: “Noise reduction in photorefractive memory by double mutually pumped phase conjugate mirrors” Proceedings of SPIE, 5362 (Photonics West 2004): 99-106(2004).*　　　　　　　　　　　　　　　
    2004
  • Bunsen, M. and Okamoto, A.: “Hologram multiplexing method with photorefractive beam-fanning speckle,” Proceedings of SPIE,5362 (Photonics West 2004):128-135(2004).*　　　　　　　　　　　　　　　
    2004
  • Takayama, Y. and Okamoto, A., “Optical manipulation of multiple stable states in photorefractive four-wave mixing,” Journal of Modern Optics, 51(2): 197-208 (2004).*　　　　　　　　　　　　　　　
    2004
  • Kori, K., Okamoto, A., Takayama, Y. and Bunsen, M.: “All-optical Free-space Board to Board Interconnection with Photorefractive Bi-directional Connection Module,” Proceedings of 9th Optoelectronics and Communications Conference / 3rd International Conf・・・　　　　　　　　　　　　　　　
    2004
    Kori, K., Okamoto, A., Takayama, Y. and Bunsen, M.: “All-optical Free-space Board to Board Interconnection with Photorefractive Bi-directional Connection Module,” Proceedings of 9th Optoelectronics and Communications Conference / 3rd International Conference on Optical Internet (OECC/COIN2004), no.13P-46:204-205(2004).*
  • Funakoshi, H. and Okamoto, A.: “Digital Recording with Dynamic Refreshing Technique by Mutually Pumped Phase Conjugator in Photorefractive Memory,” Proceedings of Optics in Computing 2004:pp.63-64(2004).*　　　　　　　　　　　　　　　
    2004
  • Nihei, H. and Okamoto, A.:”All-optical rotation gates using an atom embedded in photonic bandgap structures”, Proceedings of Optics in Computing: 151-152(2004).*　　　　　　　　　　　　　　　
    2004
  • Hondo, S., Okamoto, A. and Honma, S.: “All-Optical Bi-Directional Interconnection with Double Mutual-Pumped Phase Conjugators by using Cross-Polarized Control Beam,” Proceedings of. Optics in Computing 2004:59-60(2004).*　　　　　　　　　　　　　　　
    2004
  • Moritake, K., Okamoto, A., Mita, A. and Funakoshi, H.:“Security Enhancement of Authentic Memory by Two-Wave Encryption Method with High Resolution Phase Mask,” Proceedings of Optics in Computing 2004:53-54(2004).*　　　　　　　　　　　　　　　
    2004
  • Bunsen, M. and Okamoto, A.: “Hologram multiplexing method with random wavefront generated by photorefractive beam-fanning effect,” Proceedings of Optics in Computing 2004:129-130(2004).*
    2004
  • Ito, T., Okamoto, A., Funakoshi, H.: “Experiment on two-dimensional data restoring in fault-tolerant holographic memory” Proceedings of SPIE, 5362(Photonics West 2004): 111-118(2004).*　　　　　　　　　　　　　　　
    2004
  • Okamoto, A., Bunsen, M. and Funakoshi, H.: “Rewritable Holographic Memory using All-Optical Multiplexing and Nondestructive Reading Technology,” Proceedings of 9th Optoelectronics and Communications Conference / 3rd International Conference on Optical ・・・　　　　　　　　　　　　　　　
    2004
    Okamoto, A., Bunsen, M. and Funakoshi, H.: “Rewritable Holographic Memory using All-Optical Multiplexing and Nondestructive Reading Technology,” Proceedings of 9th Optoelectronics and Communications Conference / 3rd International Conference on Optical Internet (OECC/COIN2004), no.13P-110: 330-331(2004).*
  • Experiment on Hologram Multiplexing with Random Wavefront Generated by Photorefractive Beam-Fanning Effect
    BUNSEN Masatoshi, OKAMOTO Atsushi, The transactions of the Institute of Electronics, Information and Communication Engineers. C, J87-C, 1, 182, 183, 2004
    書換え可能なホログラム媒質であるホトリフラクティブ結晶において, その大きな非線形性により入射光波が結晶のc軸方向へ強く散乱するビームファニング現象が発生する. この現象により記録媒質内部で生成されるランダム波面を参照光としてホログラムを多重記録する手法を新たに提案し, 実験によりその基礎動作を確認する., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Yagai, T., Okamoto, A. and Bunsen, M., “All-optical wavelength demultiplexer with photorefractive grating array”: Proceedings of SPIE, 5646-47(2004).*　　　　　　　　　　　　　　　
    2004
  • Hondo, S., Okamoto, A., Sato, K. and Honma, S.: “Experiment on all-optical bi-directional interconnection with double mutual pumped phase conjugate mirrors,” Proceedings of SPIE, 5644-85 (2004).*　　　　　　　　　　　　　　　
    2004
  • Okamoto, A., Funakoshi, H., Bunsen, M. and Nishio, A: “Optical controlled matrix switch and free-space interconnection by photorefractive polymers,” Proceedings of SPIE, 5642-109 (2004).*　　　　　　　　　　　　　　　
    2004
  • Analysis of basic operation in photorefractive authentication memory with two-wave encryption method in volume hologram
    Mita Akifumi, Okamoto Atsushi, Funakoshi Hisatoshi, Proceedings of the IEICE General Conference, 2003, 1, 302, 302, 03 Mar. 2003
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • “自己励起型位相共役鏡の位相補正作用を用いたフォトリフラクティブメモリにおける画像再生実験”　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J86-C, 12, 1360, 1361, 2003
  • “自由空間光通信におけるフォールトトレラント全光通信路自動切換手法”　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J86-C, 11, 1223, 1226, 2003
  • “二つのホトリフラクティブ結晶を用いたフォールトトレラントホログラフィックメモリ”　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J86-C, 11, 1143, 1150, 2003
  • “フォトニック結晶を用いた光メモリからの量子情報検出”　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J86-C, 9, 997, 1006, 2003
  • ”フォトリフラクティブメモリにおける光フィードバック回路を用いた全光学的非破壊再生手法”　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J86-C, 3, 236, 243, 2003
  • Satoshi Honma and Atsushi Okamoto: “All-optical interconnection device with photorefractive semi-linear resonator ”, IEICE Trans. Electron., vol.E86-C, no.10, pp.2103-2110 (2003-10).*　　　　　　　　　　　　　　　
    2003
  • M. Bunsen and A. Okamoto, “Experiment on hologram multiplexing with photorefractive beam-fanning speckle,” Proc. 5th International Conference on Transparent Optical Networks, no.Tu.P.8, pp.287-290, June 2003.*　　　　　　　　　　　　　　　
    2003
  • H. Funakoshi, A. Okamoto and K. Sato, “Experiment on long-term image reading in photorefractive memory with double mutually pumped phase conjugate mirrors,” Proc. 5th International Conference on Transparent Optical Networks, no.Tu.P.9, pp.291-294, June・・・　　　　　　　　　　　　　　　
    2003
    H. Funakoshi, A. Okamoto and K. Sato, “Experiment on long-term image reading in photorefractive memory with double mutually pumped phase conjugate mirrors,” Proc. 5th International Conference on Transparent Optical Networks, no.Tu.P.9, pp.291-294, June 2003.*
  • H. Kato, A. Okamoto and M. Bunsen, “Fault-tolerant automatic routing method with two photorefractive double phase conjugate mirrors,” Proc. 5th International Conference on Transparent Optical Networks, no.Tu.P.10, pp.295-298, June 2003.*　　　　　　　　　　　　　　　
    2003
  • Hiroyuki Nihei and Atsushi Okamoto：”Two-qubit operation of two atoms embedded in photonic crystals for optical quantum computing,” Proc. 5th International Conference on Transparent Optical Networks, no.Th.C.6, pp.212-215, June 2003.*　　　　　　　　　　　　　　　
    2003
  • T. Yagai, A. Okamoto K. Sato and M. Bunsen, “All-optical interconnection with photorefractive cross-polarized four-wave mixing and control beam,” Proc. 9th Microoptics Conference, no.H12, pp.170-173, Oct. 2003.*　　　　　　　　　　　　　　　
    2003
  • S. Hondo, A. Okamoto, S. Honma and H. Funakoshi, “All-optical bi-directional interconnection with double mutual-pumped phase conjugation,” Proc. 9th Microoptics Conference, no.H13, pp.174-177, Oct. 2003.*　　　　　　　　　　　　　　　
    2003
  • H. Kato, A. Okamoto and M. Bunsen, “Fault-tolerant automatic routing method with photorefractive double phase conjugate mirrors,” Proc. 9th Microoptics Conference, no.H14, pp.178-181, Tokyo, Japan, Oct. 2003.*　　　　　　　　　　　　　　　
    2003
  • H. Funakoshi, A. Okamoto and K. Sato, “Dynamic Refreshing Technique in Photorefractive Memory with Mutually Pumped and Self-Pumped Phase Conjugate Mirrors,” Proc. International Symposium on Optical Memory (ISOM2003), no.We-F-27, pp.122-123, Nov. 2003.*　　　　　　　　　　　　　　　
    2003
  • M. Bunsen and A. Okamoto “Speckle-Multiplexed Holographic Memory with Photorefractive Beam-fanning Effect,” Proc. International Symposium on Optical Memory (ISOM2003), no.We-F-57, pp.184-185, Nov. 2003.*　　　　　　　　　　　　　　　
    2003
  • A. Mita and A. Okamoto “High Robustness against Unlawful Access in Photorefractive Authentic Memory with Two-wave Encryption Method,” Proc. International Symposium on Optical Memory (ISOM2003), no.We-F-67, pp.204-205, Nov. 2003.*　　　　　　　　　　　　　　　
    2003
  • T. Ito, A. Okamoto, S. Homma and M. Toishi “All-optical Data Restoring Method for Photorefractive Holographic Memory,” Proc. International Symposium on Optical Memory (ISOM2003), no.Th-H-05, pp.242-243, Nara, Japan, Nov. 2003.*　　　　　　　　　　　　　　　
    2003
  • Hiroyuki Nihei and Atsushi Okamoto：”THz emission from a multifunctional active atomic device in photonic crystals,” IEEE LEOS, 5th Pacific Rim Conference on Lasers and Electro-Optics (CLEO/PR), WP-(16)-3, December 2003.*　　　　　　　　　　　　　　　
    2003
  • S. Uemura, A. Okamoto and S. Honma, “All-optical auto-tracking by bi-directional connection switch with cross polarized DPCM,” Proc. 9th Microoptics Conference, no.H15, pp.182-185, Oct. 2003.*　　　　　　　　　　　　　　　
    2003
  • 「電子デバイスの基礎」<桜庭一郎，岡本 淳>　　　　　　　　　　　　　　　
    森北出版, 2003
  • Spontaneous emission from a three-level atom placed in three-dimensional photonic crystals in the long-time limit
    Hiroyuki Nihei, Atsushi Okamoto, Journal of Modern Optics, 49, 9, 1463, 1477, 20 Jul. 2002
    English
  • ”ホトリフラクティブ相互励起型位相共役現象と結晶端面を利用したセミリニア共振器を用いた全光インタコネクション”　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J85-C, 5, 402, 403, 2002
  • Experiment on Channel Branching in PRCM with Spatial Multiplexed Image
    NOMURA Junichi, OKAMOTO Atsushi, SATO Kunihiro, NAKATOGAWA Takahiko, The Transactions of the Institute of Electronics,Information and Communication Engineers. C, J85-C, 1, 35, 37, 2002
    光増幅・分岐機能を兼ね備えたPRCMにおいて, 水平方向に並列化した光信号のチャネル分岐を行うために消去光を用いる手法を提案する.空間並列化された画像情報から, 制御光の操作により望みのチャネルの情報のみの分岐が可能であることを実験的に示す., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Mitsuru Toishi, Atsushi Okamoto, Kunihiro Sato:“Experiment on Image Data Restoring in All-Optical Fault-tolerant Holographic Memory”, Seventh Optoelectronics and Communications Conference (OECC 2002) Technical Digest, 10P-80, pp346-347(2002).*　　　　　　　　　　　　　　　
    2002
  • Hisatoshi Funakoshi, Atsushi Okamoto and Kunihiro Sato: “Wavelength-Multiplexed Photorefractive Memory with Nondestructive Reading/Writing Technique”, Optics in Computing 2002 (OC2002), OTuD5, pp.132-134 (2002).*　　　　　　　　　　　　　　　
    2002
  • Satoshi Honma and Atsushi Okamoto: “Experiment on all-optical interconnection with photorefractive semi-linear resonator”, Optics in Computing 2002 (OC2002), OTuD3, pp.126-128 (2002).*　　　　　　　　　　　　　　　
    2002
  • Toshiya Kaino, Atsushi Okamoto and Satoshi Honma: “Fault Tolerant All-optical Router by Using Two All-optical Switches with Photorefractive Two-wave Mixing”, Optics in Computing 2002 (OC2002), OTuD2, pp.123-125 (2002).*　　　　　　　　　　　　　　　
    2002
  • Hiroyuki Nihei and Atsushi Okamoto: “Rotation Gate Operation in an Atomic System within Photonic Crystals for Quantum Computing”, Optics in Computing 2002 (OC2002), OTuA3, pp.68-70 (2002).*　　　　　　　　　　　　　　　
    2002
  • Tohru Hasegawa, Atsushi Okamoto, Takahiko Nakatagawa and Kunihiro Sato: “Experiment on Reconfigurable Interconnection for Free Space and Wavelength Division Multiplexing System”, Optics in Computing 2002 (OC2002), OMA1, pp.1-3 (2002).*　　　　　　　　　　　　　　　
    2002
  • Yoshihisa Takayama, Satoshi Honma, Atsushi Okamoto, “OPTICAL INVERSE FILTER FOR HOLOGRAPHIC FILTERING BY PHOTOREFRACTIVE FOUR-WAVE MIXING WITH INCOHERENT ERASURE”, Nonlinear Optics, 29, pp. 157-166(2002).*　　　　　　　　　　　　　　　
    2002
  • ”相互励起型位相共役鏡を用いた偏波により制御可能な２チャネルの全光クロスコネクションスイッチ”　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J85-C, 10, 944, 945, 2002
  • Tsutomu Nakada, Atsushi Okamoto, Kunihiro Sato, “Reconfigurable free-space all-optical interconnection with beam-fanning switch in photorefractive crystal”, Optics Communications, 208, pp.69-77 (2002).*　　　　　　　　　　　　　　　
    2002
  • Toshiya Kaino, Atsushi Okamoto, Satoshi Honma, “Fault Tolerant All-optical Router with Photorefractive All-optical Switch”, Advanced Optical Materials and Devices(AOMD2002), P28, pp. 151(2002).*　　　　　　　　　　　　　　　
    2002
  • Tokonobu Mitasaki, Atsushi Okamoto, Satoshi Honma, “All-optical interconnection with wiring maintenance technique by integrated full-linear resonator”, Advanced Optical Materials and Devices(AOMD2002), p29, pp152(2002).*　　　　　　　　　　　　　　　
    2002
  • Satoshi Honma, Atsushi Okamoto, “All-optical bi-directional cross-connector with photorefractive double phase conjugation and control beam”, Advanced Optical Materials and Devices(AOMD2002), p30, pp153(2002).*　　　　　　　　　　　　　　　
    2002
  • Mitsuru Toishi, Atsushi Okamoto, Kunihiro Sato, “Dynamic Restoring Technique for Dropout Data in All-optical Fault Tolerant Holographic Memory”, Advanced Optical Materials and Devices(AOMD2002), p31, pp154(2002).*　　　　　　　　　　　　　　　
    2002
  • Hisatoshi Funakoshi, Atsushi Okamoto, “Photorefractive Nondestructive Memory with Kitty-Type Conjugator”, Advanced Optical Materials and Devices(AOMD2002), p32, pp155(2002).*　　　　　　　　　　　　　　　
    2002
  • Satoshi Honma, Atsushi Okamoto, “Bi-directional cross connector with double phase conjugator and polarization multiplexed control signal”, Proceedings of SPIE (Holography, Diffractive Optics, and Applications), 4924, pp.282-293(2002).*　　　　　　　　　　　　　　　
    2002
  • Akifumi Mita, Atsushi Okamoto, Noriyasu Tsuji, Masatoshi Bunsen, “ High Performance Encryption Method and All-optical Authentic Memory with Photorefractive Crystal”, Proceedings of SPIE (Advanced Optical Storage Technology), 4930, pp. 351-358(2002).*　　　　　　　　　　　　　　　
    2002
  • Kazumasa Kori, Atsushi Okamoto, Takahiko Nakatogawa, Kunihiro Sato, Toshiya Kaino:“Experimant on amplification of WDM and spatial multiplexed signals in Photorefractive Connection Module”, Seventh Optoelectronics and Communications Conference (OECC 200・・・　　　　　　　　　　　　　　　
    2002
    Kazumasa Kori, Atsushi Okamoto, Takahiko Nakatogawa, Kunihiro Sato, Toshiya Kaino:“Experimant on amplification of WDM and spatial multiplexed signals in Photorefractive Connection Module”, Seventh Optoelectronics and Communications Conference (OECC 2002) Technical Digest, 10P-16, pp218-219(2002).*
  • T. Hasegawa, A. Okamoto, K. Sato, and M. Toishi, “Experiment on all-optical interconnection with wavelength multiplexed signal using single cat conjugator”, 3rd International Conference on Optics-photonics Design & Fabrication(ODF2002), P27, pp.149-150・・・　　　　　　　　　　　　　　　
    2002
    T. Hasegawa, A. Okamoto, K. Sato, and M. Toishi, “Experiment on all-optical interconnection with wavelength multiplexed signal using single cat conjugator”, 3rd International Conference on Optics-photonics Design & Fabrication(ODF2002), P27, pp.149-150(2002).
  • M. Bunsen, A. Okamoto, “All optical interconnection using spatial phase-address multiplexed signal and control pattern decoder”, 3rd International Conference on Optics-photonics Design & Fabrication(ODF2002), P26, pp.147-148(2002).　　　　　　　　　　　　　　　
    2002
  • Y. Kawata, A. Okamoto, S. Honma,“Experiment on all-optical interconnection with wavelength multiplexed signal using single cat conjugator,” 3rd International Conference on Optics-photonics Design & Fabrication(ODF2002), P28, pp.151-152(2002).　　　　　　　　　　　　　　　
    2002
  • Masatoshi Bunsen, Atsushi Okamoto, Kunihiro Sato, “Improvement of storage density in photorefractive disk-type memory by logical multilayer recording method”, Proceedings of SPIE Proceedings of SPIE (Advanced Optical Storage Technology),4930, pp.343-35・・・　　　　　　　　　　　　　　　
    2002
    Masatoshi Bunsen, Atsushi Okamoto, Kunihiro Sato, “Improvement of storage density in photorefractive disk-type memory by logical multilayer recording method”, Proceedings of SPIE Proceedings of SPIE (Advanced Optical Storage Technology),4930, pp.343-350 (2002).*
  • Tokinobu Mitasaki, Atsushi Okamoto, Satoshi Honma:“Optical maintenance technique for dynamic hologram and its application for all-optical interconnection”, Seventh Optoelectronics and Communications Conference (OECC 2002) Technical Digest, 10P-18, pp22・・・　　　　　　　　　　　　　　　
    2002
    Tokinobu Mitasaki, Atsushi Okamoto, Satoshi Honma:“Optical maintenance technique for dynamic hologram and its application for all-optical interconnection”, Seventh Optoelectronics and Communications Conference (OECC 2002) Technical Digest, 10P-18, pp222-223(2002).*
  • Tohru Hasegawa, Atsushi Okamoto, Takahiko Nakatogawa, Kunihiro Sato:“Performance enhancement for all-optical interconnection with WDM signals in photorefractive crystal”, Seventh Optoelectronics and Communications Conference (OECC 2002) Technical Diges・・・　　　　　　　　　　　　　　　
    2002
    Tohru Hasegawa, Atsushi Okamoto, Takahiko Nakatogawa, Kunihiro Sato:“Performance enhancement for all-optical interconnection with WDM signals in photorefractive crystal”, Seventh Optoelectronics and Communications Conference (OECC 2002) Technical Digest, 10P-17, pp220-221(2002).*
  • Toshiya Kaino, Atsushi Okamoto, Satoshi Honma:“Swicthing Property of Fault Tolerant All-Optical Router by Using Two All-optical switch with Photorefractive Two-Wave Mixing”, Seventh Optoelectronics and Communications Conference (OECC 2002) Technical Di・・・　　　　　　　　　　　　　　　
    2002
    Toshiya Kaino, Atsushi Okamoto, Satoshi Honma:“Swicthing Property of Fault Tolerant All-Optical Router by Using Two All-optical switch with Photorefractive Two-Wave Mixing”, Seventh Optoelectronics and Communications Conference (OECC 2002) Technical Digest, 10A3-7, pp102-103(2002).*
  • Study on image restoration by photorefractive effect
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, ARAKI Kenichi, Technical report of IEICE. OPE, 100, 639, 37, 42, 16 Feb. 2001
    A method for image restoration by photorefractive effect is studied.The already proposed methos have respective features;(1)the real-time image restoration is performed but the position to obtain the restored image is different from of the distorted image, or(2)the receive positions of the distorted and restored images are almost the same but it is far from the real-time process.To restore the image at the receive position of the distorted image, we connects the photorefractive four-wave mixing and the holographic filtering technique, where the blur function of the distorted image is introduced into the four-wave mixing process as the erase beam., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Photorefractive four-wave mixing for optical image restoration
    Yoshihisa Takayama, Atsushi Okamoto, Kenichi Araki, Proceedings of SPIE - The International Society for Optical Engineering, 4353, 247, 255, 01 Jan. 2001
  • Three-dimensional analysis of code processing in photorefractive holographic memory
    Noriyasu Tsuji, Atsushi Okamoto, Yoshihisa Takayama, Takahiko Nakatogawa, Proceedings of SPIE - The International Society for Optical Engineering, 4598, 233, 240, 01 Jan. 2001
  • 「交差偏光４波混合を用いたホトリフラクティブディスクタイプメモリにおける多重記録特性の解析及び実験」　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J84-C, 11, 1083, 1089, 2001
  • 「フォトリフラクティブ2波混合と制御光を用いた全光インタコネクション」　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J84-C, 9, 900, 901, 2001
  • 「光学的インバースフィルタへのフォトリフラクティブ４波混合の適用」　　　　　　　　　　　　　　　
    電子情報通信学会論文誌 C, J84-C, No.3, 222, 223, 2001
  • Tokinobu Mitasaki, Atsushi Okamoto, Satoshi Honma: “All-optical interconnection and routing memory by photorefractive full-linear resonator”, 8th Microoptics Conference, MOC’01, H25, pp.226-229(2001-10).*　　　　　　　　　　　　　　　
    2001
  • Tokinobu Mitasaki, Atsushi Okamoto and Satoshi Honma: “All-optical interconnection with pattern memory function by photorefractive full-linear resonator”, Proceedings of SPIE (ISPA 2001), Vol.4598-33, pp.225-232, (2001-11).*　　　　　　　　　　　　　　　
    2001
  • Hiroyuki Nihei and Atsushi Okamoto: “All-optical switching scheme using a three-level atomic system within photonic crystals”, Proceedings of SPIE (ISPA 2001), Vol.4598-31, pp.217-224,(2001-11).*　　　　　　　　　　　　　　　
    2001
  • Noriyasu Tsuji, Atsushi Okamoto, Yoshihisa Takayama and Takahiko Nakatogawa: ”Three-dimensional analysis of code processing in photorefractive holographic memory”, Proceedings of SPIE (ISPA 2001), Vol.4598-34, pp.233-240(2001-11).*　　　　　　　　　　　　　　　
    2001
  • Mitsuru Toishi, Atsushi Okamoto and Kunihiro Sato: “Experiment on automatic data duplication in all-optical holographic memory”, Proceedings of SPIE (ISPA 2001), Vol.4598-28, pp.200-207(2001-11).*　　　　　　　　　　　　　　　
    2001
  • Hisatoshi Funakoshi, Atsushi Okamoto and Kunihiro Sato: “Image reading and writing experiment on photorefractive nondestructive memory”, Proceedings of SPIE (ISPA 2001), Vol.4598-27, pp.193-199(2001-11).*　　　　　　　　　　　　　　　
    2001
  • Hiroyuki Nihei, Atsushi Okamoto: “Switching Effect of a Single Three-level Atom Within Photonic Crystals for Quantum Computation”, 8th Microoptics Conference, MOC’01, H41, pp.290-293,(2001-10).*　　　　　　　　　　　　　　　
    2001
  • Noriyasu Tsuji, Atsushi Okamoto, Yoshihisa Takayama, Satoshi Honma: “All-optical Authentication and Unlawful Access Detection by Photorefractive Four-wave Mixing”, 8th Microoptics Conference, MOC’01, H29, pp.242-245(2001-10).*　　　　　　　　　　　　　　　
    2001
  • Takahiko Nakatogawa, Atsushi Okamoto Kunihiro Sato: “Multi-channel reading in free space for WDM signals with photorefractive connection module”, 8th Microoptics Conference, MOC’01, H26, pp.230-233(2001-10).*　　　　　　　　　　　　　　　
    2001
  • Satoshi Honma, Atsushi Okamoto, Yoshihisa Takayama, "Photorefractive duplex two-wave mixing and all-optical deflection switch", J. Opt. Soc. Am. B, 18(7), pp. 974-981, (2001-7).*　　　　　　　　　　　　　　　
    2001
  • Takahiko Nakatogawa, Atsushi Okamoto, Kunihiro Sato: “Multiplicity of free space WDM system with Photorefractive Connection Module”, Conference Proceedings of OEEC/IOOC 2001, Poster Session-Stream 1-1, pp.341-343(2001-07).*　　　　　　　　　　　　　　　
    2001
  • Satoshi Honma, Atsushi Okamoto: “All-optical interconnection by optical feedback and double phase conjugation”, Conference Digest of CLEO/Europe-EQEC Focus Meetings 2001,C-NLP 230, pp.217(2001-06).*　　　　　　　　　　　　　　　
    2001
  • Takahiko Nakatogawa, Atsushi Okamoto, Kunihiro Sato: “Experiment on free space WDM system with Photorefractive Connection Module”, Conference Digest of CLEO/Europe-EQEC Focus Meetings 2001,C-NLP 226, pp.213(2001-06).*　　　　　　　　　　　　　　　
    2001
  • Hiroyuki Nihei, Atsushi Okamoto: “Photonics crystal systems for high-speed optical memory device on an atomic scale”,ICOSM2001-06,Proceedings of SPIE Vol. 4416, pp.470-473(2001-06).*　　　　　　　　　　　　　　　
    2001
  • Atsushi Okamoto, Satoshi Honma, Toshiya Kaino, Mitsuru Toishi: “Fault-tolerant system using all-optical sensing and feed back circuits”,ICOSM2001-06,Proceedings of SPIE Vol. 4416, pp.396-399(2001-06).*　　　　　　　　　　　　　　　
    2001
  • Takayuki Kaneda, Atsushi Okamoto, Kunihiro Sato, “All-optical image cross connector and the picture distribution technology,”Optics in Computing, OSA Technical Digest, OWD2 , pp.96-98 (2001-1).*　　　　　　　　　　　　　　　
    2001
  • Yoshiyasu Kato, Atsushi Okamoto, Kunihiro Sato, “Multi-valued phase-conjugate reflectivity controlled by rotation of the pump beam polarization,”Optics in Computing, OSA Technical Digest, OWD1 ,pp.93-95(2001-1).*　　　　　　　　　　　　　　　
    2001
  • Toshiya Kaino, Atsushi Okamoto, Tsutomu Nakada and Takayuki Kaneda:”Fault tolerant all-optical routing device with two-wave mixng”,CLEO/Pacific Rim 2001 TECHNICAL DIGEST Volume-II,pp.256-257(2001-07).*　　　　　　　　　　　　　　　
    2001
  • Satoshi Honma, Atsushi Okamoto: “Resonant State Switching with Photorefractive Enhanced Semi-Linear Configuration, and It’s Applications”, Conference Proceedings of OEEC/IOOC 2001, Poster Session-Stream 2-6, pp.386-398(2001-07).*　　　　　　　　　　　　　　　
    2001
  • Atsushi Okamoto, Takahiko Nakatogawa, Tohru Hasegawa, Satoshi Honma: “All-optical Reconfigurable Interconnection for Free Space and Wavelength Division Multiplexing System”, 8th Microoptics Conference, MOC’01, H24, pp.222-225(2001-10).*　　　　　　　　　　　　　　　
    2001
  • Hisatoshi Funakoshi, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato: “Thresholding Property of Nondestructive Memory with Photorefractive Crystal”, Conference Proceedings of OEEC/IOOC 2001, Poster Session-Stream 2-7, pp.389-391(2001-07).*　　　　　　　　　　　　　　　
    2001
  • Mitsuru Toishi, Atsushi Okamoto, Satoshi Honma, Masatoshi Bunsen: “Optimization of Beam Intensities For High Efficient Fault-tolerant Holographic Memory”, Conference Proceedings of OEEC/IOOC 2001, Poster Session-Stream 2-9, pp.394-396(2001-07).*　　　　　　　　　　　　　　　
    2001
  • Hiroyuki Nihei, Atsushi Okamoto: “Proposal of Optical Multifunctional Device Composed of an Atomic System Placed Within Photonic Crystals”, Conference Proceedings of OEEC/IOOC 2001, Poster Session-Stream 2-10, pp.397-398(2001-07).*　　　　　　　　　　　　　　　
    2001
  • Hisatoshi Funakoshi, Atsushi Okamoto, Masatoshi Bunsen, Kunihiro Sato: “Photorefractive Nondestructive Memory with Optical Feedback Circuit”, Conference Digest of CLEO/Europe-EQEC Focus Meetings 2001,C-NLP 231, pp.218(2001-06).*　　　　　　　　　　　　　　　
    2001
  • Mitsuru Toishi, Atsushi Okamoto, Satoshi Honma and Masatoshi Bunsen ”Fault-tolerant holographic memory with two photorefractive crystals”,CLEO/Pacific Rim 2001 TECHNICAL DIGEST Volume-II,pp.160-161(2001-07).*　　　　　　　　　　　　　　　
    2001
  • Toshiya Kaino, Atsushi Okamoto, Yasuhiko Nakanishi, Kunihiro Sato: “Experiment of Fault Tolerant All-Optical Routing Device with two-wave mixing”, Conference Proceedings of OEEC/IOOC 2001, Poster Session-Stream 1-11, pp.363-364(2001-07).*　　　　　　　　　　　　　　　
    2001
  • Hiroyuki Nihei and Atsushi Okamoto: “Switching Time of Optical Memory Devices Composed of Photonic Crystals with an Impurity Three-Level Atom”, Jpn. J. Appl. Phys., Vol. 40, Part 1(No. 12), pp.6835-6840 (2001-12).*　　　　　　　　　　　　　　　
    2001
  • Analysis of optimum incident condition in all-optical interconnection by matrix switch with photorefractive two-wave mixing
    NAKANISHI Yasuhiko, OKAMOTO Atsushi, HONMA Satoshi, NAKADA Tsutomu, SATO Kunihiro, Technical report of IEICE. OPE, 100, 494, 19, 24, 07 Dec. 2000
    We propose an all-optical interconnection by matrix switch with the photorefractive two-wave mixing. We explain the concept of the optical interconnection and experiment on 2×2 operation. We analyze the optimum incident condition of beams by numerical analysis for the improvement of the switching performance., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Characteristics of multiplex recording in photorefractive disk-type memory
    BUNSEN Masatoshi, OKAMOTO Atsushi, SATO Kunihiro, Technical report of IEICE. OPE, 100, 494, 13, 18, 07 Dec. 2000
    In this paper, we propose the disk-type memory with the photorefractive crystal. In the photorefractive memory, holograms can be multiplexed in a same spot of the crystal. Among various multiplexing method, we employ the shift multiplexing for our memory. In this method, we can angularly multiplex holograms by means of the shift of the recording position induced by the rotation of the disk. We analyze the amount of shift required for multiplexing differentiable holograms and carry out an experiment to measure the amount of shift. On the other hand, there is a problem that stored data is erased by the subsequent recordings when holograms are multiplexed. To store a grate deal of data, it is essential to balance the subsequent erasure against the initial exposure by means of recording schedule. We suggest two kinds of recording schedule for this multiplexing method, and estimate the optimum recording conditions and the generation efficiency of the output., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Multi-valued property of phase conjugation and control of its threshold condition
    Y. Kato, A. Okamoto, Y. Takayama, Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest, 159, 160, 01 Dec. 2000
  • Optical deconvolution by using photorefractive effect
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, ARAKI Kenichi, Technical report of IEICE. OPE, 100, 95, 61, 66, 19 May 2000
    We attempt to utilize the photorefractive effect for optical image restoration that employs the holographic filtering technique. The blur function of the distorted image is introduced in four-wave mixing process as the erase beam. The phase conjugate beam generated by the process reads the hologram. With numerical analysis, the condition in which the amplitude of the phase conjugate beam is inversely proportional to the intensity of the erase beam is determined. As a result we show the optical deconvolution is performed and the original image appears where the distortion is eliminated., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Experiment of Channel Branching with the Spatial Multiplexed Signal on the Connection Module(PRCM)
    NOMURA Junichi, OKAMOTO Atsushi, SATO Kunihiro, 電気学会研究会資料. : The Papers of Technical Meeting on Electromagnetic Theory, IEE Japan. EMT, 電磁界理論研究会, 2000, 14, 7, 12, 19 Jan. 2000
    Japanese
  • Beam distribution of optical distributor in forward four-wave mixing
    SEKINE Tomotsugu, OKAMOTO Atsushi, SATO Kunihiro, 電気学会研究会資料. : The Papers of Technical Meeting on Electromagnetic Theory, IEE Japan. EMT, 電磁界理論研究会, 2000, 14, 13, 18, 19 Jan. 2000
    Japanese
  • Quantum fluctuation interference in the atomic population of a photonic band gap crystal
    NIHEI Hiroyuki, OKAMOTO Atsushi, 電気学会研究会資料. : The Papers of Technical Meeting on Electromagnetic Theory, IEE Japan. EMT, 電磁界理論研究会, 2000, 1, 51, 56, 18 Jan. 2000
    Japanese
  • Bistability control of phase conjugate reflectivity by erase beam in photorefractive four-wave mixing
    H Okada, A Okamoto, Y Takayama, ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS, 83, 6, 8, 14, 2000
    English
  • Kaneda, T., Okamoto, A., Honma, S., Nakada, T., and Sato, K.: “Optical image connector with photorefractive four-wave mixing”, proceedings of 2nd International Conference on Optical Design and Fabrication (ODF2000), P27: 229-232 (2000)*　　　　　　　　　　　　　　　
    2000
  • Nomura, J., Okamoto, A., Okada, H., Sato, K.: “Experiment on channel branching in the photorefractive connection module”, proceedings of 2nd International Conference on Optical Design and Fabrication (ODF2000), P28: 233-246 (2000)*　　　　　　　　　　　　　　　
    2000
  • Nihei, H., Okamoto, A.: “Dynamic Phase Properties of Atomic Population on the Excited State in a Photonic Crystal”, Fifth Optoelectronics and Communications Conference (OECC 2000) Technical Digest, 12P-37: 260-261, (2000) . *　　　　　　　　　　　　　　　
    2000
  • Okamoto, A.: “All Optical Interconnection by Photorefractive Effect and Self-Routing Application”, Optics in Computing 2000, SPIE 4089: OC2000, 939-947 (2000)*　　　　　　　　　　　　　　　
    2000
  • Nakada, T., Okamoto, A., Sato, K.: “Experiments of reconfigurable all-optical interconnection by beam fanning switch”, Conference on Lasers and Electro-Optics (CLEO2000), TECHNICAL DIGEST, CLEO2000: 508 (2000) *　　　　　　　　　　　　　　　
    2000
  • Kaneda, T., Okamoto, A., Sato, K., Nakada, T.: “Experiment on All-Optical Interconnection with Photorefractive Four-Wave Mixing”, Fifth Optoelectronics and Communications Conference (OECC 2000) Technical Digest, 12P-5:196-197, (2000) *　　　　　　　　　　　　　　　
    2000
  • Kato, Y., Okamoto, A., Takayama, Y.: “Multi-valued property of phase conjugation and control of its threshold condition”, Conference on Lasers and Electro-Optics, TECHNICAL DIGEST, CLEO2000: 159-160 (2000)*　　　　　　　　　　　　　　　
    2000
  • Nakatogawa, T., Okamoto, A., Kentaro Watanabe, Sato, K., Okada, H.: “Gain Stabilized Configuration in PRCM Circuit and Optical Bus System”, Optics in Computing 2000, SPIE 4089: OC2000, 345-350 (2000) *　　　　　　　　　　　　　　　
    2000
  • Bunsen, M., Okamoto, A., Sato, K.: “Enhancement of storage density in photorefractive disk-type memory with cross polarized four-wave mixing”, Optics in Computing 2000, SPIE 4089: OC2000, .806-814 (2000) *　　　　　　　　　　　　　　　
    2000
  • Honma, S., Okamoto, A., Takayama, Y.: “Optical Demodulator with Photorefractive Cross Polarized Duplex Two-Wave Mixing”, Optics in Computing 2000, SPIE 4089: OC2000, 867-875 (2000)　　　　　　　　　　　　　　　
    2000
  • Yoshida,T., Okamoto, A., Y. Takayama, Sato, K. : “Operable conditions of the beam-fanning novelty filter for the c axis and the incident angle”, App. Opt.,39(32): 5940-5948 (2000)*　　　　　　　　　　　　　　　
    2000
  • Funakoshi, H., Okamoto, A., Bunsen,M. and Sato, K.: “Nondestructive readout technique with photorefractive holographic memory”, proceedings of 2nd International Conference on Optical Design and Fabrication (ODF2000), P29: 237-240 (2000)*　　　　　　　　　　　　　　　
    2000
  • Honma, S., Okamoto, A., Sato, K.: “Experiment on All-Optical Switch with Photorefractive Duplex Two-Wave Mixing”, Conference on Lasers and Electro-Optics/Europe (CLEO/Europe2000), CONFERENCE DIGEST, CtuN6: 156,(2000)*　　　　　　　　　　　　　　　
    2000
  • Takahashi, Y., Okamoto, A., Honma, S.: “All-optical Channel Selector and Angular Resolution of KNbO3 Crystal”, Fifth Optoelectronics and Communications Conference (OECC 2000) Technical Digest, 12P-67: 320-321, ( 2000) .*　　　　　　　　　　　　　　　
    2000
  • Nakanishi, Y., Okamoto, A., Nakada, T., Honma, S.: “All-optical interconnection by matrix switching with photorefractive two-wave mixing”, Conference on Lasers and Electro-Optics /Europe(CLEO/Europe2000), CONFERENCE DIGEST, CTuK86: 129,(2000)*　　　　　　　　　　　　　　　
    2000
  • Bunsen, M., Okamoto, A., Sato, K.: “Optimization of multiplexing scheme in photorefractive disk-type memory”, Conference on Lasers and Electro-Optics/Europe(CLEO/Europe2000), CONFERENCE DIGEST, CtuK77: 125,(2000)*　　　　　　　　　　　　　　　
    2000
  • Tsuji, N., Okamoto, A., Honma, S. and Bunsen, M.: “AUTHENTIC FUNCTION IN PHOTOREFRACTIVE HOLOGRAPHIC MEMORY”, International Symposium on Optical Memory (ISOM2000), Technical Digest, Fr-J-27: 160-161(2000).*　　　　　　　　　　　　　　　
    2000
  • Nihei, H., Okamoto, A.: “Switching time of optical memory devices composed of photonic crystals”, proceedings of 2nd International Conference on Optical Design and Fabrication (ODF2000), P20: 201-204 (2000)*　　　　　　　　　　　　　　　
    2000
  • Analysis of multi-valued property of phase-conjugate reflectivity in cross-polarized four-wave mixing
    KATO Yoshiyasu, OKAMOTO Atsushi, TAKAYAMA Yoshihisa, Technical report of IEICE. OME, 99, 350, 61, 66, 13 Oct. 1999
    In this report, the multi-valued property of the phase-conjugate reflectivity in cross-polarized four-wave mixing with photorefractive crystal is analyzed. First, the phase-conjugate reflectivity in cross-polarized four-wave mixing is derived by using the grating-integral method, and its property is analyzed. We show that multi-valued property of phase-conjugate reflectivity is appeared when the coupling strength is efficiently strong. In addition, multi-valued property in cross-polarized four-wave mixing for probe ratios and pump ratios is also discussed., The Institute of Electronics, Information and Communication Engineers, Japanese
  • ホトリフラクティブ多重2波混合における定常および時間応答解析
    本間 聡, 岡本 淳, 高山 佳久, 電子情報通信学会技術研究報告, 99, 351, 55, 60, 13 Oct. 1999
    電子情報通信学会, Japanese
  • Concept of photorefractive connection module by photorefractive four-wave mixing with extraordinary writing beams and an ordinary reading beam
    A Okamoto, H Matsuoka, M Saito, Y Takayama, M Takamura, OPTICAL REVIEW, 6, 3, 189, 195, May 1999
    English
  • Analysis and experiment of beam-ranning novelty filter
    吉田 匡, 岡本 淳, 高山 佳久, 佐藤 邦宏, Proceedings of the IEICE General Conference, 1999, 1, 352, 352, 08 Mar. 1999
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Analysis of Threshold in Controlling of Optical Bistability
    OKADA Hajime, OKAMOTO Atsushi, TAKAYAMA Yoshihisa, SATO Kunihiro, Technical report of IEICE. LQE, 98, 510, 31, 36, 20 Jan. 1999
    We have reported that one of the bistable value of the phase conjugate reflectivity is selected by illuminating the erase beam in photorefractive four-wave mixing with beam fanning. In this paper, a bistable region of the phase conjugate reflectivity is clarified by solving the coupling wave equations for the first time. Then the phase conjugate reflectivity is calculated by the temporal response analysis in consideration of the intensity variation of the erase beam, and we prove the validity of the bistable region. Besides, we show that one of the bistable value of the phase conjugate reflectivity can be selected in experiments., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Free-space all-optical interconnection with a photorefractive crystal
    Tsutomu Nakada, Atsushi Okamoto, Yoshihisa Takayama, Kunihim SatO, CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics, 2, 373, 374, 1999
    Institute of Electrical and Electronics Engineers Inc., English
  • Proposition of all-optical switch with photorefractive crystal and analysis of the influence of the phase mismatching
    S. Honma, A. Okamoto, Y. Takayama, K. Sato, CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics, 2, 573, 574, 01 Jan. 1999
  • Photorefractive connection module and multistage optical bus system
    Atsushi Okamoto, Junichi Nomusa, Hisashi Matsuoka, Yoshihisa Takayama, Kunihiro Sato, CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics, 2, 371, 372, 01 Jan. 1999
  • Tsutomu Nakada, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato: “Free-space All-optical Interconnection with a Photorefractive Crystal”, CLEO/Pacific Rim99 TECHNICAL DIGEST, Volume 2, pp.373-374 (1999)*　　　　　　　　　　　　　　　
    1999
  • Hajime Okada, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato: “Control Method of Bistable Values of Phase Conjugate Reflectivity by Erase Beam in Photorefractive Four-Wave Mixing with Beam Fanning”, Optical Society of America, Trends in Optics and ・・・　　　　　　　　　　　　　　　
    1999
    Hajime Okada, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato: “Control Method of Bistable Values of Phase Conjugate Reflectivity by Erase Beam in Photorefractive Four-Wave Mixing with Beam Fanning”, Optical Society of America, Trends in Optics and Photonics, TOPS Volume XXVII, pp.287-291(1999)
  • Bistability Control of Phase Conjugate Reflectivity by Erase Beam in Photorefractive Four - Wave Mixing
    OKADA Hajime, OKAMOTO Atsushi, TAKAYAMA Yoshihisa, SATO Kunihiro, The Transactions of the Institute of Electronics,Information and Communication Engineers. C-(0xF9C1), J82-C-I, 8, 477, 483, 1999
    ホトリフラクティブ結晶を用いた4波混合において, 結晶の非線形効果が強い場合には, 発生する位相共役光は多値をとる. 本論文では, 前進ポンプ光の代わりに結晶中で発生するファニング光を用いた4波混合において, プローブ光に対する位相共役光の比である位相共役反射率の双安定値を, 消去光によって制御する方法を新たに提案する. ファニング光を含む4波混合を解析的に解くのは非常に困難であるが, プローブ光の一部がファニングし, 相互作用領域で前進ポンプ光として作用するモデルを用いることによって, 従来の4波混合の解析手法を適用することができる. まず位相共役反射率の定常解析を行い, 消去光の強度に対して位相共役反射率が双安定値をもつことを示す. 次に時間応答解析により, 消去光の強度を変化させ, 位相共役反射率の双安定値を制御する. 最後に実験によって, 理論との比較検討を行う., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Atsushi Okamoto, Junichi Nomura, Hisashi Matsuoka, Yoshihisa Takayama, Kunihiro Sato: “Complementary Arrangement of Photorefractive Connection Module for Optical Bus System”, Optical Society of America, Trends in Optics and Photonics, TOPS Volume XXVII・・・　　　　　　　　　　　　　　　
    1999
    Atsushi Okamoto, Junichi Nomura, Hisashi Matsuoka, Yoshihisa Takayama, Kunihiro Sato: “Complementary Arrangement of Photorefractive Connection Module for Optical Bus System”, Optical Society of America, Trends in Optics and Photonics, TOPS Volume XXVII, pp.568-574(1999)
  • Atsushi Okamoto, Yoshihisa Takayama, Hajime Okada: “ OPTICAL CONTROLLED VECTOR MULTIPLIER WITH PHOTOREFRACTIVE FOUR-WAVE MIXING”, Micro optics Conference-99, MF32, pp.236-239(1999)*　　　　　　　　　　　　　　　
    1999
  • Masatoshi Bunsen, Atsushi Okamoto, Motoyuki Ogawa, Kazunori Ikeda: “CROSS TALK REDUCTION AND NON-DESTRUCTIVE TECHNIQUE WITH PHOTOREFRACTIVE HOLOGRAPHIC MEMORY”, Micro optics Conference-99, MF34, pp.244-247(1999)*　　　　　　　　　　　　　　　
    1999
  • A. Okamoto, K. Watanabe, H. Matsuoka, Y. Takayama：”PRCM and its optical bus application by photorefractive four-wave mixing with cross-polarization pumping”, Proceedings of SPIE(Optical Engineering for Sensing and Nanotechnology - ICOSN'99), 3740, pp.4・・・　　　　　　　　　　　　　　　
    1999
    A. Okamoto, K. Watanabe, H. Matsuoka, Y. Takayama：”PRCM and its optical bus application by photorefractive four-wave mixing with cross-polarization pumping”, Proceedings of SPIE(Optical Engineering for Sensing and Nanotechnology - ICOSN'99), 3740, pp.450-453 (1999)*
  • Atsushi Okamoto, Junichi Nomura, Hisashi Matsuoka, Yoshihisa Takayama, Kunihiro Sato: “Photorefractive Connection Module and Multistage Optical Bus System”, CLEO/Pacific Rim99 TECHNICAL DIGEST, Volume 2, pp.371-372 (1999)*　　　　　　　　　　　　　　　
    1999
  • Satoshi Honma, Atsushi Okamoto, and Yoshihisa Takayama: “All-optical Photorefractive Switch with Phase Difference between Control Beams”, Optical Society of America, Trends in Optics and Photonics, TOPS Volume XXVII, pp.575-580(1999)　　　　　　　　　　　　　　　
    1999
  • Atsushi Okamoto, Tsutomu Nakada, Satoshi Honma : ”Reconfigurable Optical Interconnection Controlled by Light, with Photorefractive Technique”, PROCEEDINGS APCC/OECC’99, Vol.1, 136, pp.397-400 (1999)*　　　　　　　　　　　　　　　
    1999
  • Kentaro Watanabe, Atsushi Okamoto, Yoshihisa Takayama : “Gain Stabilization in Optical Bus System with Cascaded PRCM”, PROCEEDINGS APCC/OECC’99, Vol.1, 136, pp.409-412 (1999)*　　　　　　　　　　　　　　　
    1999
  • Satoshi Honma, Atushi Okamoto, Yoshihisa Takayama, Kunihiro Sato: “Proposition of All-optical Switch with Photorefractive Crystal and Analysis of the Influence of the Phase Mismatching”, CLEO/Pacific Rim99 TECHNICAL DIGEST, Volume 2, pp.573-574 (1999)*　　　　　　　　　　　　　　　
    1999
  • Operative conditions of beam-fanning novelty filter in photorefractive crystals
    YOSHIDA Tadashi, OKAMOTO Atsushi, TAKAYAMA Yoshihisa, SATO Kunihiro, Technical report of IEICE. OPE, 98, 472, 25, 30, 15 Dec. 1998
    We reveal the angle range of c-axis to operate beam-fanning novelty filter in an available photorefractive crystals, which is one of the devices to detect what is new in a input image. First, we explain the phenomenon of beam-fanning and the mechanism of beam-fanning novelty filter. Then, we show the method for analyzing beam-fanning with fourier transforms. We reveal the conditions suitable for the novelty detection of c-axis angular regions in beam-fanning novelty filter by numerical analysis. Besides we verify numerical results experimentally., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Optical deflect switch with the photorefractive effect
    HONMA Satoshi, OKAMOTO Atushi, TAKAYAMA Yoshihisa, Technical report of IEICE. PS, 98, 362, 31, 36, 23 Oct. 1998
    We propose a deflect switch with photorefractive effect which can be control optically.First, we present a optical setup of the optical deflect switch. Next, we explain the basic theory of the switch with spatial distribution of the photorefractive grating which depend on the phase difference of control beams. And we derive the coupled wave education of them. Calcuating the intensity variation of signal and control beams, we analyze the deflect switching property., The Institute of Electronics, Information and Communication Engineers, Japanese
  • The analysis of cross talk in disk-type memory with cross polarized reflection grating
    OGAWA Motoyuki, OKAMOTO Atsushi, SATO Kunihiro, TAKAYAMA Yoshihisa, Technical report of IEICE. LQE, 98, 342, 35, 40, 21 Oct. 1998
    In this paper, we apply the phase mismatching property of the cross polarized reflection grating in order to show the condition for suppressing the cross talk in the disk-type memory. First, we show that the reflection grating is suitable for realizing the disk-type memory with photorefractive four-wave mixing. Next, we analyze the influence of the signal beam angle and the pump ratio, difined by intensity ratio of reading beam to reference beam, on the phase mismatching property. And we consider the dependency of the cross talk on the phase mismatching. Also we analyze the influence of spherical reference beam on the cross talk. Furthermore, we show the experiment of the phase mismatching property of the cross polarized reflection grating and compare with the theoretical analysis., The Institute of Electronics, Information and Communication Engineers, Japanese
  • The analysis of refreshing systems in optical neural networks with photorefractive crystals
    OKU Yusuke, OKAMOTO Atsushi, TAKAYAMA Yoshihisa, Technical report of IEICE. LQE, 98, 342, 41, 46, 21 Oct. 1998
    We report theoretical and expermental analysis of refreshing systems which are necessary for optical neural networks with photorefractive crystals. In the theoretical analysis, first, we show that refreshing systems are effective for sustaining holograms. And we reveal the properties of output beam intensity of the system for a pair of Cat mirrors reflectivities. These Cat Mirrors have an effect on sustenance and amplification of holograms. Then, we consider the optimum conditions to realize refreshing systems. Next, we examine the properties of beam intensity of output from the refreshing system for writing and reading beams intensities. In the end, we prove our theoretical analysis by experiments., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Multi-solutions control of photorefractive four-wave mixing
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, SATO Kunihiro, Technical report of IEICE. LQE, 98, 255, 13, 18, 27 Aug. 1998
    We show a method to converge the phase conjugate reflectivity of the four-wave mixing to one of its multi-solutions for the first time. The phase conjugate reflectivity calculated by steady-state analysis has at most three solutions with a certain coupling strength. Then, we analyze the temporal behavior of the four-wave mixing with consideration of the phase difference of interaction beams, and show that two values of the reflectivity among the three can be selected by controlling the initial condition of the phase difference. In addition, we represent the state transition diagrams of the four-wave mixing and suggest a possibility of an all-optical switch or all-optical memory by the photorefractive four-wave mixing., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Squeezed-state parameter with respect to phase in the intercavity squeezer
    Nihei Hiroyuki, Okamoto Atsushi, Sato Kunihiro, Proceedings of the IEICE General Conference, 1998, 1, 375, 375, 06 Mar. 1998
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Photorefractive disk-type memory with cross polarized reflection grating
    Ogawa Motoyuki, Okamoto Astsushi, Sato Kunihiro, Takayama Yoshihisa, Proceedings of the IEICE General Conference, 1998, 1, 384, 384, 06 Mar. 1998
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Optical flip-flop with two photorefractive four-wave mixing
    Takayama Yoshihisa, Okamoto Atsushi, Sato Kunihiro, Proceedings of the IEICE General Conference, 1998, 1, 06 Mar. 1998
    The Institute of Electronics, Information and Communication Engineers, Japanese
  • Gain stabilization in optical bus system with cascaded PRCM
    K. Watanabe, A. Okamoto, Y. Takayama, 5th Asia-Pacific Conference Communications and 4th Optoloelectronics Communications Conference: The Conference-Vitality to New Century, APCC/OECC 1999, 1, 136, 409, 412, 01 Jan. 1998
  • 2. Takayama, Y., Okamoto, A.,Saito, M. and Sato,K.: "Cross polarized photorefractive four-wave mixing with extraordinary writing beams and an ordinary reading beam", Appl. Opt., 37, 5: 2967-2973 (1998)＊　　　　　　　　　　　　　　　
    1998
  • 1. Takayama,Y.,Okamoto, A.,Sato, Kumagai,K. and Aizawa,Y.: "Study on optimum incident angles of cross polarized four-wave mixing with a photorefractive crystal", Opt. Rev., 5, 1: 49-54 (1998)＊　　　　　　　　　　　　　　　
    1998
  • 3. Matsuoka, H.,Okamoto, A., Sato, K., Takamura,M.: "Reflectivity of cross-polarized four-wave mixing in consideration of pump depletion", J. Opt. Soc. Am. B, 15, 5: 1545-1552 (1998)＊　　　　　　　　　　　　　　　
    1998
  • 4. Takamura, M., Okamoto A. and Sato,K.: "Steady-state analysis of photorefractive ring resonator with self-pumped four-wave mixing (PRRR-SPFWM)", IEICE, Trans. Electron., E81-C, 7: 1122-1127 (1998)＊　　　　　　　　　　　　　　　
    1998
  • 5. Okada, H., Okamoto, A., Takayama，Y.: "Bistability control of phase conjugate reflectivity by erase beam in photorefractive four wave mixing", Third Optoelectronics and Communications Conference (OECC'98) Technical Digest, 14P-33:252-253, Makuhari Me・・・　　　　　　　　　　　　　　　
    1998
    5. Okada, H., Okamoto, A., Takayama，Y.: "Bistability control of phase conjugate reflectivity by erase beam in photorefractive four wave mixing", Third Optoelectronics and Communications Conference (OECC'98) Technical Digest, 14P-33:252-253, Makuhari Messe (1998)＊
  • 「Cat型位相共役器による消去光を用いた光インタコネクション」　　　　　　　　　　　　　　　
    『電子情報通信学会論文誌』 C-I, J81-C-I, 9, 535, 543, 1998
  • Phase matching property of cross polarization four wave mixing in BaTiO3 crystal
    M Saito, A Okamoto, K Sato, Y Takayama, OPTICAL REVIEW, 4, 6, 686, 690, Nov. 1997
    English
  • Multi-stability and temporal response of phase conjugate reflectivity in SPFWM
    OKU Yusuke, OKAMOTO Atsushi, TAKAYAMA Yoshihisa, Technical report of IEICE. OPE, 97, 312, 65, 70, 14 Oct. 1997
    We analyze multi-stability and temporal response of phase conjugate reflectivity in SPFWM(Self-Pumped Four-Wave Mixing) theoretically. The analysis is effective in a refreshing system which is necessary for an optical neural network with photorefractive crystals. In the steady-state analysis, we show multi-stability of phase conjugate reflectivity in SPFWM, such as in parallel-polarized four wave mixing. In the analysis of temporal response, we reveal the properties of the phase conjugate reflectivity for the coupling strength, the probe ratio, the reflectivity of a Cat mirror. Then, we consider the appropriate conditions to realize a refreshing system., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Consideration of optimum incident beam angles of cross polarized four-wave mixing
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, SATO Kunihiro, KUMAGAI Kazuhumi, AIZAWA Yugo, Technical report of IEICE. OPE, 97, 312, 59, 64, 14 Oct. 1997
    We consider the optimum incident beam angles of the cross polarized four-wave. First, the phase matching angles are obtained in the both operation modes with ordinary writing beams and an extraordinary reading beam which we call Mode1 and with extraordinary writing beams and an ordinary reading beam which we call Mode2, respectively. Next, practicable angle ranges of the incident beams are shown with consideration of the total reflection of the phase conjugate beam in the both cases that the writing beams are on the same boundary of the crystal and that the writing beams are on the neighboring boundaries, respectively. As the result, the coupling coefficient within the angle range is obtained and the optimum incident beam angles of the cross polarized four-wave mixing to realize the effective beam interaction in Mode1 and Mode2 are obtained, respectively., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Steady state analysis and experiment of the cross-polarized two-wave mixing under phase matching condition in BaTiO_3 crystals
    YOSHIDA Naohiro, OKAMOTO Atsushi, SATO Kunihiro, TAKAYAMA Yosihisa, INOUE Tadahiko, Technical report of IEICE. OPE, 97, 312, 71, 76, 14 Oct. 1997
    In this paper, we analyze the codirectional and contradirectional cross polarized two-wave mixing (CPTWM) in BaTiO_3 crystals, and examine experimentally. First, the phase matching condition which gives maximum conversion efficiency in cross polarized forward four-wave mixing (CPFFWM) is studied. CPFFWM is under the specific condition, regarded as CPTWM with polarization switching property as well as amplification property. Then, the closed form solution for codirectional and contradirectional CPTWM is derived, and polarization switching property is revealed. Besides, the polarization switching property is confirmed experimentally., The Institute of Electronics, Information and Communication Engineers, Japanese
  • High transient reflectivity of four-wave mixing in a BaTiO3 crystal by a pulsed pump beam
    Y Takayama, A Okamoto, K Sato, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 14, 10, 2570, 2576, Oct. 1997
    English
  • Phase matching of reflection grating in cross polarized four-wave mixing
    Saito Motoki, Okamoto Atsushi, Takayama Yoshihisa, Proceedings of the IEICE General Conference, 1997, 1, 446, 446, 06 Mar. 1997
    ホトリフラクティブ結晶を用いた4波混合の研究が盛んに行われ, 交差偏光結合を用いた解析もされている。しかし, その多くは透過形回折格子の解析のみであった。そこで本報告では, 交差偏光結合を用いた透過形及び反射形回折格子について解析し, その上比較を行う。, The Institute of Electronics, Information and Communication Engineers, Japanese
  • Bistability control of photorefractive four-wave mixing by forward pump beam
    Takayama Yoshihisa, Okamoto Atsushi, Sato Kunihiro, Proceedings of the IEICE General Conference, 1997, 1, 444, 444, 06 Mar. 1997
    Introduction Four-wave mixing with a photorefractive crystal have been studied actively and their bistable properties have been reported. But no idea to control the bistability have been obtained. So, we propose a method to control the bistability and demonstrate it theoretically and experimentally iri this report., The Institute of Electronics, Information and Communication Engineers, English
  • Optical Interconnection with four-wave mixing using an erase beam
    Aizawa Yugo, Okamoto Atsushi, Sato Kunihiro, Proceedings of the IEICE General Conference, 1997, 1, 451, 451, 06 Mar. 1997
    光インターコネクションとは, 従来の計算機では電気的に行われている配線を光で行うものである。これにより超並列計算機の配線ボトルネックの解消が期待できる。本報告では, 入射光と偏波が直交している消去光を用いた画像処理操作を応用して, 4波混合と消去光を用いた新たな光インターコネクションデバイスを提案して, その実験を行う。, The Institute of Electronics, Information and Communication Engineers, Japanese
  • Analysis and experiment of temporal response in cross polarization four-wave mixing with BaTiO_3 crystal
    IKEDA Kazunori, OKAMOTO Atsushi, TAKAYAMA Yoshihisa, AIZAWA Yugo, Technical report of IEICE. LQE, 97, 35, 79, 84, 14 Feb. 1997
    We analyze the temporal response of the cross polarization four-wave mixing in BaTiO_3 photorefractive crystal. The coupling equations which describe the interaction among forward pump beam, backward pump beam, phase conjugate beam and probe beam are derived. We explain the correlation between coupling coefficients of ordinary wave and those of extraordinary waves. The generation process of the phase conjugate beam is shown and we analyze that the phase conjugate reflectivity in consideration on the variation of the pump ratio and the probe ratio. In addition, the experiment with a BaTiO_3 crystal is performed., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Temporal analysis of photorefractive two-wave mixing with phase difference and its application of novelty filter
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, Technical report of IEICE. LQE, 97, 35, 73, 78, 14 Feb. 1997
    Temporal property of photorefractive two-wave mixing with phase difference is analyzed for the first time. First, equations which describe the variations of the optical intensity and phase difference between two beams interacting each other are derived. It is shown that the phase difference varies both temporally and spatially even if the coupling coefficient is real number. Next, the temporal properties of the intensity and the phase difference in the photorefractive interaction region are analyzed in the case that the initial phase difference is changed. In addition, one of the setups for the novelty filter by the two-wave mixing is shown. In the case of continuously moving image, the time resolution of the novelty filter is investigated., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Calculation and experiment on diffraction efficiency of pulse beam operating four-wave mixing in photorefractive crystal
    Koji Enbutsu, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato, Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi), 80, 10, 18, 01 Jan. 1997
  • Bistable phase-conjugate reflectivity controlled by a forward pump beam
    Yoshihisa Takayama, Atsushi Okamoto, Mototsugu Takamura, Kunihiro Sato, Journal of the Optical Society of America B: Optical Physics, 14, 2664, 2669, 01 Jan. 1997
  • Takayama, Y., Okamoto, A., Sato, K. and Takamura, M. : "Bistable phase conjugate reflectivity controlled by forward pump beam", J. Opt. Soc. Am. B., 14(10) : 2664-2669 (1997)＊　　　　　　　　　　　　　　　
    1997
  • Takamura, M., Okamoto, A., Sato, K. and Takayama, Y. : "Unidirectional／Bidirectional Switchable Ring Resonator with Photorefractive Self-Pumped Four-Wave Mixing", Proc. 1997 Topical Meeting on Photorefractive Materials, Effects and Devices (Optical Soc・・・　　　　　　　　　　　　　　　
    1997
    Takamura, M., Okamoto, A., Sato, K. and Takayama, Y. : "Unidirectional／Bidirectional Switchable Ring Resonator with Photorefractive Self-Pumped Four-Wave Mixing", Proc. 1997 Topical Meeting on Photorefractive Materials, Effects and Devices (Optical Society of America, PR'97), FP 25 : 621-624 (1997)＊
  • Saito, M., Okamoto, A., Takayama, Y. and Takamura, M. : "Phase matching property of cross polarized four wave mixing in BaTiO3 crystal and optical bus application", Proc. 1997 Topical Meeting on Photorefractive Materials, Effects and Devices (Optical S・・・　　　　　　　　　　　　　　　
    1997
    Saito, M., Okamoto, A., Takayama, Y. and Takamura, M. : "Phase matching property of cross polarized four wave mixing in BaTiO3 crystal and optical bus application", Proc. 1997 Topical Meeting on Photorefractive Materials, Effects and Devices (Optical Society of America. PR'97), WP 28 : 204-207 (1997)＊
  • Takayama, Y., Okamoto, A., Sato, K and Saito, M. ＊ : "Method to control the bistability of four-wavemixing with a photorefractive crystal", Proc. 1997 Topical Meeting on Photorefractive Materials, Effects and Devices (Optical Society of America, PR‘97)・・・　　　　　　　　　　　　　　　
    1997
    Takayama, Y., Okamoto, A., Sato, K and Saito, M. ＊ : "Method to control the bistability of four-wavemixing with a photorefractive crystal", Proc. 1997 Topical Meeting on Photorefractive Materials, Effects and Devices (Optical Society of America, PR‘97), WP26 : 196-197 (1997)＊
  • 「ホトリフラクティブ結晶とパルス光を用いた４光波混合における回折効率の計算と実験」　　　　　　　　　　　　　　　
    『電子情報通信学会論文誌』, C-I, J80-C-1(1)/,18-24, 1997
  • 「ホトリフラクティブ結晶を用いた４波混合における双安定性の前進ポンプ光による制御」　　　　　　　　　　　　　　　
    『電子情報通信学会論文誌』, c-I, J80-c-I(11)/,510-516, 1997
  • Cross polarized photorefractive coupling with extraordinary writing beams and an ordinary reading beam and application to optical switch
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, SAITO Motoki, SATO Kunihiro, Technical report of IEICE. OPE, 96, 410, 43, 48, 12 Dec. 1996
    Cross polarized photorefractlve coupling with extraordinary writing beams and an ordinary reading beam is analyzed In this paper, first, the coupling coefficient is calculated both cases that the ordinary beams interact and that the extraordinary beams interact respectively. Second, the phase match angle and the phase mismatching is calculated. As the result, sharp angular filtering property of the this four-wave mixing is obtained. Besides the experimental result which measured the phase conjugate beam power by cross polarized coupling is shown. At last, an optical switch is proposed as an application of the cross polarized photorefractive coupling, The Institute of Electronics, Information and Communication Engineers, Japanese
  • Spatial phase dependence of the Squeezed parameter with respect to phase
    NIHEI Hiroyuki, OKAMOTO Atsushi, SATO Kunihiro, Technical report of IEICE. LQE, 96, 399, 91, 96, 10 Dec. 1996
    An altemative approach to derive the phase diagram which shows generation process of the squeezed variance is reported. Using this phase diagram, a spatial phase dependence of the squeezed parameter with respect to phase is shown. Furthermore, considering the spatial phase dependence of the squeezed parameter, the transmission characteristic of squeezed quantum noise generated via interactive squeezer is calculated., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Optical interconnection with a cat conjugator and erase beam
    AIZAWA Yuugo, OKAMOTO Atsushi, SATO Kunihiro, IEICE technical report. EMD, 96, 217, 67, 72, 21 Aug. 1996
    We can perform the real-time image-processing operations by applying an external crase beam to a self-pumped phase conjugator. Incident beam including the image data creates the index grating inside the photorefractive crystal BaTiO_3. The erase beam has the effect of destroying the index grating, so it can modify the image data. Applying this theory, we suggest a new method to construct the optical interconnection. First, the decreasing of the phase conjugate reflectivity by applying the erase beam is theoretically analyzed. Next, the method of achieving the optical interconnection is shown by optical vector multiplication and erase beam. Finally, the optical interconnection experiments of 2×2 and 4×4 are performed with a BaTiO_3 photorefractive crystal and a Ar laser., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Bistable condition of phase conjugate reflectivity by four-wave mixing with photorefractive crystal
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, SATO Kunihiro, IEICE technical report. EMD, 96, 217, 61, 66, 21 Aug. 1996
    The bistable condition of the phase conjugate reflectivity by the four-wave mixing with a photorefractive crystal is analyzed for the first time. It has been known that the phase conjugate reflectivity has bistable property, that is, two or more values of reflectivity exist for a given set of incident beam power and coupling strength. We show that the convergence value of the phase conjugate reflectivity can be controlled by the initial condition of the backward pump beam, by temporal analysis of the four-wave mixing., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Reflectivity of Photorefractive Four Wave Mixing with Cross Polarized Pumping Beams in Consideration of Phase Mis-Matching
    OKAMOTO Atsushi, SATO Kunihiro, TAKAMURA Mototsugu, SAITO Motoki, TAKAYAMA Yoshihisa, IEICE technical report. EMD, 96, 217, 79, 84, 21 Aug. 1996
    To examine the characteristics of photorefractive four-wave mixing that uses cross polarized pump beams, strict solutions for coupling mode equations in undepleted pump approximation are obtained. The acceptance angle when BaTiO_3 crystals are used is first found by calculating the phase conjugate reflectivity of cross polarization coupling systems. Furthermore, an experiment is conducted using BaTiO_3 crystals and phase conjugate beam is generated successfully using cross polarization coupling. In a new trial in the experiment, a high reflectivity is obtained by shifting the angle of the diffraction grating vector on the c-axis of crystals from 90 degrees. Also, a new concept of PRCM is proposed for applications in optical communication systems such as optical interconnection and optical bus systems., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Properties of oscillation intensities in photorefractive ring resonator with self-pumped four-wave mixing
    TAKAMURA Mototsugu, OKAMOTO Atsushi, SATO Kunihiro, Technical report of IEICE. LQE, 96, 98, 85, 90, 18 Jun. 1996
    We first suggested a photorefractive ring resonator with self-pumped four-wave mixing in which the backward pump beam is complex conjugate of the forward pump beam, and analyzed the properties of oscillation intensities in it. Giving the boundary conditions of a ring resonator and pump beams, we derived the oscillation intensities by solving the coupling equations of four-wave mixing in photorefractive crystal. Then, we calculated the oscillation intensities as functions of coupling strength for various values of reflectivity of mirrors constituting the cavity and of Cat mirror. We considered such phenomena in detail that the threshold coupling strength or oscillation depends on reflectivity of Cat mirror and that oscillation occurs bidirectionally or unidirectionally due to magnitude of coupling strength., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Effect of Pump Beam Angle on Diffraction Image of Phase Conjugate Mirror with Gaussian Beam Pumping
    Yamada Masahide, Okamoto Atsushi, Sato Kunihiro, Proceedings of the IEICE General Conference, 1996, 1, 354, 354, 11 Mar. 1996
    位相共役波を画像処理に応用する際には、位相共役鏡による回折像の特性解析が検討課題となる。本報告では、より実際的な特性解析を行う目的から、ポンプ光にガウスビームを用い、ポンプ光の入射角の変化を考慮した位相共役鏡の回折像について解析レポンプ光の入射角の影響を数値計算によって検討する。, The Institute of Electronics, Information and Communication Engineers, Japanese
  • High-efficiency transient phase conjugation by turning on reading beam incident upon steady-state transmission grating in BaTiO3 crystal
    Y Takayama, A Okamoto, K Sato, OPTICS COMMUNICATIONS, 123, 4-6, 603, 606, Feb. 1996
    English
  • Analysis of oscillation intensities in photorefractive ring resonator with self-pumped four-wave mixing
    Takamura Mototsugu, Okamoto Atsushi, Sato Kunihiro, Proceedings of the IEICE General Conference, 351, 351, 1996
    ホトリフラクティブ結晶内での4波混合を用いたリング共振器における双方向発振の解析は既に報告されている。定常発振状態にある場合、発振光強度は4波混合の結合強度によって変化する。本報告では、光学系の簡略化などの目的から自己励起形4波混合を用いたリング共振器を新たに提案し、結合強度に対する発振光強度の特性を理論解析する。, The Institute of Electronics, Information and Communication Engineers, Japanese
  • 「自己励起形４波混合における位相共役反射率の特性」　　　　　　　　　　　　　　　
    『電子情報通信学会論文誌C-I』, J79-C-I, 4, 109, 116, 1996
  • Angular Dependence of Phase Conjugate Intensity in Forward Four-wave Mixing with Gaussian Beam Pumping
    HAGIWARA Kei, OKAMOTO Atsushi, KANEKO Hiroyuki, KOYANAGI Kojiro, SATO Kunihiro, The Transactions of the Institute of Electronics,Information and Communication Engineers. C-(0xF9C1), J79-C-I, 8, 295, 302, 1996
    位相共役光学の進展に伴い, 前進4波混合に関する研究が盛んに行われている. 実用的な光学系設計の観点から, 有限なスポットサイズのポンピング光を用いた場合における位相共役光強度の光線角度依存性を検討することは, 特に光波の分離を考える上で重要である. 本論文では, 光力ー媒質を用いた前進4波混合において, 位相共役光の光線角度に対する強度分布を初めて理論解析した. まず, 位相共役光強度が比較的小さく, 二つのポンピング光の重なり合った領域に比べ薄い非線形媒質を用いたときの位相共役光強度を導出した. また, その結果を用いて位相共役光のz軸に対する出射角,および,x-y面内における方位角に着目した数値計算を行った. 次に, 二つのポンピング光で形成される相互作用領域が媒質中にすべて含まれる十分に厚い媒質を用いた場合についても同様の解析を行った. 更に, 薄い媒質を用いた場合と厚い媒質の場合との相異を述べ, 平面波ポンピングの場合との比較, 検討も行った. 最後に, 厚い媒質についてガウスビームポンピングにおけるスポットサイズや波面曲率の変化が強度分布に及ぼす影響などについて述べた., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Angular dependence on conversion efficiency on forward four-wave mixing in consideration of pump depletions
    HAGIWARA Kei, OKAMOTO Atsushi, SATO Kunihiro, Technical report of IEICE. LQE, 95, 350, 87, 92, 13 Nov. 1995
    In this report, we analyzed the phase-conjugate conversion efficiency of forward four-wave mixing with boxcar optical configration in consideration of pump depletions. First, phase-conjugate conversion efficiency is derived assuming that all beam intensities are variable. Second, we calculated the relation between conversion efficiency and coupling strength, varying the pump beam angle and pump ratio, and showed the possibility of multivalued conversion efficiency when phase matching is violated. At last, we analyzed the effect on angular mismatch between probe beam and pump ones., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Analysis of the phase conjugate waves in variances
    Nihei H, Okamoto A, Sato K, Mishima T, Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 50, 2, 447, 447, 16 Mar. 1995
    The Physical Society of Japan (JPS), Japanese
  • Analysis of and experiment on time response of four‐wave mixing in a photorefractive crystal
    Yoshihisa Takayama, Atsushi Okamoto, Kunihiro Sato, Teruhito Mishima, Ichiro Sakuraba, Electronics and Communications in Japan (Part II: Electronics), 78, 4, 9, 19, 1995
    English
  • Analysis and Experiment on Temporal Respose of Four-Wave Mixing in Photorefractive Crystal
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, SATO Kunihiro, MISHIMA Teruhito, SAKURABA Ichiro, The Transactions of the Institute of Electronics,Information and Communication Engineers. C-(0xF9C1), 77, 9, 481, 489, 25 Sep. 1994
    ホトリフラクティブ結晶を用いた4波混合の時間応答特性を結晶の物性パラメータを考慮して新たに解析する.BaTiO_3結晶を用いて位相共役光発生の実験を行い,数値計算結果と測定結果を比較する.まず,ホトリフラクティブ効果における結合係数の時間的変化を,結晶の物性パラメータを用いて導き,透過形回折格子による位相共役反射率の時間応答を導出する.前進ポンプ光と後進ポンプ光の入射強度比であるポンプ比が位相共役反射率の時間応答に与える影響を数値計算によって初めて明らかにする.次に,BaTiO_3結晶を用いた4波混合による位相共役光発生の実験を行い,位相共役光電力の定常値と,定常値に達するまでの応答時間を測定する.最後に,ポンプ比の変化が位相共役光の定常値および応答時間に与える影響を解析結果と実験結果を用いて比較検討する.ポンプ比を9倍に大きくした場合,位相共役光電力の定常値は,理論計算値で約30倍,測定値で約24倍に増加した.一方,応答時間は,理論計算値で約4倍,測定値で約4.5倍遅くなった.これらの結果より,BaTiO_3結晶の応答時間をポンプ比によって制御できることを示している., The Institute of Electronics, Information and Communication Engineers, Japanese
  • 28p-E-2 Analisys of the squeezed states with considering the initial phase of fields
    Nihei Hiroyuki, Okamoto Atsushi, Mishima Teruhito, Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 49, 2, 359, 359, 16 Mar. 1994
    The Physical Society of Japan (JPS), Japanese
  • Properties of Reflectivities in Self-Pumped Phase Conjugators by Photorefractive Crystal
    高山 佳久, 岡本 淳, 三島 瑛人, Bulletin of the Faculty of Engineering,Hokkaido University, 168, p21, 31, Feb. 1994
    北海道大学 = Hokkaido University, Japanese
  • Reflectivity of Self-Pumped Phase Conjugator with Reflection Grating
    TAKAYAMA Yoshihisa, OKAMOTO Atsushi, MISHIMA Teruhito, The Transactions of the Institute of Electronics,Information and Communication Engineers. C-(0xF9C1), 77, 1, 30, 32, 25 Jan. 1994
    自己励起形位相共役器において,ホトリフラクティブ結晶中に反射形回折格子が生じている場合の位相共役反射率を新たに導出した.結晶の外部にある共振器を構成する鏡の反射率と位相共役反射率の関係を数値計算によって明らかにし,反射形回折格子の特性を検討した., The Institute of Electronics, Information and Communication Engineers, Japanese
  • Temporal response of four-wave mixing in photorefractive crystal
    Takayama Yoshihisa, Okamoto Astushi, Sato Kunihiro, Mishima Teruhito, Sakuraba Ichiro, IEICE technical report. Electron devices, 93, 168, 15, 20, 26 Jul. 1993
    We analyzed the temporal response of phase conjugate reflectivities in photorefractive crystal by four wave-mixing. First,assuming only transmission grating is generated,we offered the phase conjugate reflectivity that includes temporal parameters of photorefractive crystal.Where absorption in the crystal is neglected and the undepleted pumps approximatoin is made.Second, keeping probe beam power constant,we calculated the response time and steady-state value of the reflectivity by changing the ratio between forward-pump beam power and backward-pump beam power.In addition,we made a experiment and found the experimental result coincides with theoretical one qualitatively., The Institute of Electronics, Information and Communication Engineers, Japanese

Books and other publications

  • ホログラム最新技術～感光材料の開発から実製品への応用まで～　　　　　　　　　　　　　　　
    情報機構, 2007
  • ホログラフィックメモリーのシステムと材料　　　　　　　　　　　　　　　
    シーエムシー出版, 2006
  • Systems, Devices and Materials for the Holographic Data Storage　　　　　　　　　　　　　　　
    2006

Lectures, oral presentations, etc.

  • Progressive Hologram Recording and Reconstruction Using Complex Amplitude Generation and Detection Technologies
    Atsushi Okamoto, Atsushi Shibukawa, Akihisa Tomita, Masanori Takabayashi
    International Symposium on Optical Memory 2013, Aug. 2013, Japanese, Invited oral presentation
    [Invited], [International presentation]
  • Spatial mode excitation and separation using spatial phase control technology
    A. Okamoto, A. Tomita, K. Kawabata, Y. Wakayama
    CLEO-PR & OECC/PS 2013, Jul. 2013, English, Invited oral presentation
    [Invited], [International presentation]
  • Recording and Reconstruction of 38-Level Spatial Quadrature-Amplitude Modulation Signal in Double-Referential Holographic Memory
    ZUKERAN Keisuke, OKAMOTO Atsushi, TAKABAYASHI Masanori, SHIBUKAWA Atsushi, TOMITA Akihisa
    ITE Technical Report, 15 Feb. 2013, Japanese, Invited oral presentation
    We propose a double-referential holographic memory (DRHM) that can detect phase modulation signal by just entering reference beam into recording medium without additional system for generation and irradiation of the beam to interfere with signal beam. In this technique, by highly-accurate and simplified complex amplitude detection, high multi-level phase modulation signal and spatial quadrature-amplitude modulation (SQAM) signal become available, so it is expected that storage capacity and data transfer rate are greatly increased. In this paper, we describe the basic operation of the DRHM and evaluate multiple recording/reconstruction characteristics by numerical simulation. Besides, the method for furthermore improving reconstruction quality is newly proposed and its effectiveness is demonstrated., [Invited], [Domestic Conference]
  • 岡本 淳, “光複素振幅の制御技術とモードの励振・分離に関する研究　　　　　　　　　　　　　　　
    岡本 淳
    フォトニックICT研究会, Aug. 2012, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • 空間位相制御技術を用いたモードの励振・分離に関する研究　　　　　　　　　　　　　　　
    岡本 淳
    OCS研究会, 第3回ディジタル信号処理による新しい光伝送技術～100G and Beyond～, Jul. 2012, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • 位相変調技術を用いた自己参照型ホログラフィックメモリ　　　　　　　　　　　　　　　
    岡本 淳
    フォトニクスポリマー研究会, Jun. 2012, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • モード分割通信用の空間モード励振・分離技術　　　　　　　　　　　　　　　
    岡本 淳
    第59回応用物理学関係連合講演会, Mar. 2012, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • Holographic Memory System with Spatial Quadrature Amplitude Modulation　　　　　　　　　　　　　　　
    OKAMOTO Atsushi
    Optics and Photonics Japan 2011, Nov. 2011, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • BCI-1-7 Spatial mode excitation and separation for mode division multiplexing technology
    Okamoto Atsushi, Soma Daiki, Oda Takuya, Tomita Akihisa, Wakayama Yuta
    Proceedings of the Society Conference of IEICE, 30 Aug. 2011, Japanese
    [Invited]
  • B-10-98 Ultra-broad tuning range of reconfigurable optical add-drop multiplexer using dynamic holographic diffraction grating
    Wakayama Yuta, Okamoto Atsushi, Tomita Akihisa
    Proceedings of the IEICE General Conference, 28 Feb. 2011, Japanese
  • Dynamic Hologram for Mode-Division Multiplexing Communication Technology　　　　　　　　　　　　　　　
    OKAMOTO Atsushi
    31th Annual Meeting of The Laser Society of Japan, Jan. 2011, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • B-10-52 Experiment on All-optical Demultiplexer for Mode Division Multiplex Communication Technique
    Oda Takuya, Okamoto Atsushi, Morita Kazuyuki
    Proceedings of the IEICE General Conference, 02 Mar. 2010, Japanese
  • BI-8-2 High Performance Intersatellite Communication based on Double Phase Conjugation Technology
    Okamoto Atsushi, Fujita Tomohiro, Wakayama Yuta, Takayama Yoshihisa
    Proceedings of the IEICE General Conference, 02 Mar. 2010, Japanese
  • Autonomic Waveguide Formation with Sn2P2S6 Crystal and Multi-layered Reconfigurable Optical Wiring
    KOJIMA YASUNORI, OKAMOTO ATSUSHI, GRABAR ALEXANDER A, SATO KUNIHIRO, TAKABAYASHI MASANORI
    電気・情報関係学会北海道支部連合大会講演論文集(CD-ROM), 17 Oct. 2009, English

Affiliated academic society

  • 電子情報通信学会　　　　　　　　　　　　　　　
  • 日本光学会　　　　　　　　　　　　　　　
  • The Optical Society of America(OSA)　　　　　　　　　　　　　　　
  • Optical Society of Japan　　　　　　　　　　　　　　　
  • IEICE(The Institute of Electronics, Information and Communication Engineers)　　　　　　　　　　　　　　　

Research Themes

  • 空間CDMと光位相共役の融合による光計測技術
    科学研究費助成事業
    30 Jun. 2023 - 31 Mar. 2026
    岡本 淳
    本研究は，光複素振幅の空間成分が複素共役の関係にある光位相共役とその前後で行う光学的情報処理を仮想化して実行する光計測技術を創出すること、また、深層学習を用いた超解像信号処理を融合することで、光走査系や音響素子が不要な新たな3次元光断層イメージング、特に，3次元的な定量位相イメージングの可能性を検討することを目的としている。
    本年度は、位相共役波を仮想的に生成する直前のプロセスにおいて、物理的な計測系による干渉縞の取得精度が3次元断層像の再生精度に影響を与えている点に着目し、干渉縞の取得精度を向上することによる計測精度の改善・向上を試みた。具体的には、光複素振幅の物理的な計測結果に対して、畳み込みニューラルネットワーク(CNN: Convolutional Neural Network)を用いて超解像処理を行うことで計測結果の精度向上を行うことを提案した。CNNにより計測の際に失われた情報を予測・回復することで、実際のカメラの持つ精度以上の高精度な測定を可能にする。テストデータを用いた検証の結果、CNNを用いることによって画像SN比において、6dB以上の大幅な改善が得られることを示した。
    これに加えて、位相共役波を仮想的に生成して復調された物体像に対して、再度仮想的な計測を行うことにより、最初の計測よりも、高精度な断層計測を実現できることを数値シミュレーションによりはじめて明らかにした。
    日本学術振興会, 挑戦的研究(萌芽), 北海道大学, 23K17755
  • 光複素振幅制御技術を用いたモード拡散多重光ファイバ通信に関する研究　　　　　　　　　　　　　　　
    科学研究費補助金
    2013
    岡本 淳
    Principal investigator, Competitive research funding
  • 光ファイバMIMO通信技術創出に向けての多重空間モード分離・結合デバイスの研究　　　　　　　　　　　　　　　
    2009 - 2011
    岡本 淳
    科学研究費補助金, Principal investigator, Competitive research funding
  • 光集積回路・導波路チップ間のリコンフュギュラブルな自動配線技術　　　　　　　　　　　　　　　
    平成20年度SCAT研究助成(研究費助成)
    2008 - 2010
    岡本 淳
    テレコム先端技術研究支援センター, Principal investigator, Competitive research funding
  • ダイナミック・リコンフィギュラブルな光素子の創出　　　　　　　　　　　　　　　
    [e11] 第39回三菱財団研究助成 自然科学研究助成
    2008 - 2009
    岡本 淳
    三菱財団, Principal investigator, Competitive research funding
  • しきい値秘密分散機能を有する全光学的な暗号・認証技術に関する研究　　　　　　　　　　　　　　　
    科学研究費補助金
    2008 - 2009
    岡本 淳
    Principal investigator, Competitive research funding

Industrial Property Rights

  • ホログラム記録・消去装置およびホログラム記録・消去方法　　　　　　　　　　　　　　　
    Patent right, 文仙正俊, 古田洋介, 岡本 淳
    特願2008-016095
    特許4997428
  • 光波長フィルタ装置　　　　　　　　　　　　　　　
    Patent right
    特許公開２００９－１４５４２９
  • ホログラム複製装置およびホログラム複製方法　　　　　　　　　　　　　　　
    Patent right
    特許公開２００８－２８７１０７
  • 記録再生装置、記録再生方法、再生装置及び再生方法　　　　　　　　　　　　　　　
    Patent right
    特開2008-97738
  • 記録再生装置、記録再生方法、再生装置及び再生方法　　　　　　　　　　　　　　　
    Patent right
    特許公開２００８－９７７３８
  • 多重ホログラム転写装置および多重ホログラム転写方法　　　　　　　　　　　　　　　
    Patent right, 伊藤輝将, 岡本 淳
    特願2006-143051
    特開2007-316152
    特許4815595
  • ファニング光結合構造およびそのファニング光結合構造を用いた光増幅器　　　　　　　　　　　　　　　
    Patent right
    特開2007-43087
  • 双方向光配線形成方法　　　　　　　　　　　　　　　
    Patent right
    特開2007-41519
  • 画像記録方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 森竹 潔
    特願2006-052904
    特開2007-232919
    特許4876222
  • ホログラムメモリ装置およびこの装置に適用されるホログラムリフレッシュ方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 伊藤 輝将
    特願2005-169796
    特開2006-343586
    特許4765067
  • 光中継装置および光中継方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 村中 秀史
    特願2005-133199
    特許4670047
  • 光インターコネクション装置および光インターコネクション方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 本藤 聡一郎, 高木 清史
    特願2004-346725
    特開2005-189844
  • 位相共役光発生装置　　　　　　　　　　　　　　　
    Patent right
    特開2005-292792
  • ホログラム処理装置およびホログラム処理方法　　　　　　　　　　　　　　　
    Patent right
    特開2006-208858
  • ホログラム記録装置およびホログラム記録方法　　　　　　　　　　　　　　　
    Patent right
    特開2006-184570
  • 光インターコネクション装置および光インターコネクション方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 植村 俊介, 高木 清史
    特願2005-039465
    特開2005-309385
    特許4533770
  • ホログラムメモリ装置およびホログラム記録方法　　　　　　　　　　　　　　　
    Patent right
    特開2005-189845
  • ホログラムメモリ装置及びホログラムの消去方法　　　　　　　　　　　　　　　
    Patent right
    特開2006-126642
  • ホログラム多重記録装置およびホログラム多重記録方法ならびにホログラム再生方法　　　　　　　　　　　　　　　
    Patent right
    特開2005-134659
  • 光スイッチ装置および光伝搬経路接続切り替え装置　　　　　　　　　　　　　　　
    Patent right, 高山 佳久, 岡本 淳, 本間 聡
    特願2003-062748
    特開2004-271929
    特許3811777
    特許第3811777
  • 光伝送システムおよび光伝送方法　　　　　　　　　　　　　　　
    Patent right
    特開2004-165966
  • マトリクススイッチ型インターコネクション装置およびそのインターコネクション方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 高木 清史
    特願2002-190330
    特開2004-37510
    特許4060134
  • ホログラフィック光メモリ装置およびそのメモリ修復方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 本間 聡, 甲斐野 俊也, 外石 満, 高木 清史
    特願2002-126532
    特開2003-317486
    特許4285941
  • ホトリフラクティブ導波路型インターコネクション装置およびそのインターコネクション方法　　　　　　　　　　　　　　　
    Patent right
    特開2003-255418
  • 複素振幅像生成装置および複素振幅像生成方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 渋川敦史
    特願2013-233492
  • 複素振幅画像再生装置および複素振幅画像再生方法、ならびに、散乱位相画像生成装置および散乱位相画像生成方法　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 渋川敦史, 後藤優太
    特願2013-168989
  • ノイズ除去方法およびノイズ除去装置,記録再生方法および記録再生装置,ならびに,画像計測方法および画像計測装置　　　　　　　　　　　　　　　
    Patent right, 岡本 淳, 渋川敦史, 若山雄太
    特願2012-213102
  • ホログラム再生方法、光位相強度変換方法、暗号化位相変調信号の復号方法、ホログラム記録再生装置
    Patent right, 岡本 淳, 高林 正典
    特願2011-154192
  • ホログラフィックメモリの記録方法および再生方法ならびにホログラフィックメモリの記録装置および再生装置
    Patent right, 岡本 淳, 瑞慶覧 圭佑, 高林 正典, 渋川 敦史
    特願2011-152685
  • ホログラフィックメモリ再生装置およびホログラフィックメモリの再生方法、復調装置および復調方法、ならびに観測装置および観測方法
    Patent right, 岡本 淳, 九里 佳祐, 高林 正典
    特願2010-234640
  • OPTICAL COMMUNICATION SYSTEM
    Patent right, 岡本 淳, 森田一行
    特願2009-249726
    特許US8,649,680 B2

syllabus

  • 光エレクトロニクス特論, 2024年, 修士課程, 情報科学院
  • 光エレクトロニクス特論, 2024年, 博士後期課程, 情報科学院
  • 光デバイス学特論, 2024年, 博士後期課程, 情報科学研究科
  • 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
  • 応用光工学, 2024年, 学士課程, 工学部