Prof. Junji Ohtsubo Profile

Prof. Junji Ohtsubo

Professor at Univ of Shizuoka

SPIE Involvement:

Author

Publications (19)

SPIE Journal Paper | 20 April 2012 Open Access

Optical security device providing fingerprint and designed pattern indicator using fingerprint texture in liquid crystal

Keizo Nakayama, Junji Ohtsubo

OE, Vol. 51, Issue 4, 040506, (April 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.4.040506

KEYWORDS: Information security, Liquid crystals, Polymers, Polarizers, Photopolymerization, Polarization, Photography, Light scattering, Photomicroscopy, Crystal optics

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Proceedings Article | 18 June 2004 Paper

Instability and dynamic characteristics of self-pulsating semiconductor lasers with optical feedback

Hajime Koshio, Junji Ohtsubo

Proceedings Volume 5349, (2004) https://doi.org/10.1117/12.528765

KEYWORDS: Semiconductor lasers, Active optics, Laser optics, Mirrors, Pulsed laser operation, Light sources, Solids, Optical storage, Reflectors, Laser stabilization

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Proceedings Article | 18 June 2004 Paper

Synchronization in chaotic vertical-cavity surface-emitting semiconductor lasers

Natsuki Fujiwara, Junji Ohtsubo

Proceedings Volume 5349, (2004) https://doi.org/10.1117/12.528755

KEYWORDS: Polarization, Vertical cavity surface emitting lasers, Chaos, Semiconductor lasers, Laser optics, Spectrum analysis, Beam splitters, Laser damage threshold, Telecommunications, Power meters

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Proceedings Article | 19 November 2003 Paper

Giga-hertz message transmission based on chaos synchronization in semiconductor lasers

Junji Ohtsubo, Kenji Kusumoto

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.524870

KEYWORDS: Transmitters, Semiconductor lasers, Receivers, Chaos, Laser optics, Complex systems, Optical filters, Bandpass filters, Linear filtering, Laser systems engineering

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Proceedings Article | 19 November 2003 Paper

Broad-band chaos synchronization in strongly injection-locked semiconductor lasers with optical feedback

Junji Ohtsubo, Koji Ohyagi, Yoshiro Takiguchi

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.524876

KEYWORDS: Semiconductor lasers, Chaos, Laser optics, Modulation, Optical communications, Data transmission, Transmitters, Receivers, Laser communications, Light sources

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SPIE Journal Paper | 1 January 2001

Optimization of encrypted holograms in optical security systems

Mitsuhiro Yamazaki, Junji Ohtsubo

OE, Vol. 40, Issue 01, (January 2001) https://doi.org/10.1117/12.10.1117/1.1334947

KEYWORDS: Holograms, 3D image reconstruction, Image encryption, Binary data, Computer security, Algorithms, Image processing, Annealing, Image quality, Fourier transforms

Proceedings Article | 19 July 1999 Paper

Low-frequency fluctuations and frequency locking in semiconductor lasers with optical feedback

Junji Ohtsubo, Yoshiro Takiguchi, Yun Liu

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354755

KEYWORDS: Modulation, Semiconductor lasers, Laser optics, Chaos, Mirrors, Reflectivity, Adaptive optics, Communication engineering, Optical communications, Astatine

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Proceedings Article | 28 June 1999 Paper

Terminal attractor optical associative memory for pattern recognition

Xin Lin, Masahiko Mori, Junji Ohtsubo, Masanobu Watanabe

Proceedings Volume 3864, 38641A (1999) https://doi.org/10.1117/12.997584

KEYWORDS: Content addressable memory, Optical pattern recognition, Numerical simulations, Neurons, Dynamical systems, Control systems, Thermodynamics, Optical storage, Spatial light modulators, CCD cameras

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SPIE Journal Paper | 1 December 1996

Testing parameters in a common test method for phi90 mm/600 Mbyte phase-change optical disks

Seiya Yamada, Takahiro Kubo, Kohei Yamauchi, Junji Ohtsubo, Masahisa Shinoda, T. Utakouji, Toshiaki Iwai

OE, Vol. 35, Issue 12, (December 1996) https://doi.org/10.1117/12.10.1117/1.601115

KEYWORDS: Optical discs, Distortion, Phase measurement, Computer simulations, Optical testing, Standards development, Optics manufacturing, Testing and analysis, Manufacturing, Modulation

Proceedings Article | 24 September 1996 Paper

Dynamical and coherent characteristics of semiconductor lasers with external optical feedback

Yun Liu, Junji Ohtsubo, Shu-Ying Ye

Proceedings Volume 2886, (1996) https://doi.org/10.1117/12.251885

KEYWORDS: Semiconductor lasers, Chaos, Laser stabilization, Reflectivity, Laser optics, Radon, Laser resonators, Optical character recognition, Solids, Laser applications

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Proceedings Article | 20 September 1996 Paper

Memory capacity of terminal attractor optical associative memory

Xin Lin, Junji Ohtsubo

Proceedings Volume 2890, (1996) https://doi.org/10.1117/12.251970

KEYWORDS: Content addressable memory, Neural networks, Neurons, Numerical simulations, Computer simulations, Mathematical modeling, Thermodynamics, Statistical modeling, Thermography, Statistical analysis

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SPIE Journal Paper | 1 August 1996

Optical neural networks with terminal attractors for pattern recognition

Xin Lin, Junji Ohtsubo

OE, Vol. 35, Issue 08, (August 1996) https://doi.org/10.1117/12.10.1117/1.600795

KEYWORDS: Neural networks, Computer simulations, Neurons, Pattern recognition, Polarization, Optical pattern recognition, Binary data, Spatial light modulators, Content addressable memory, Mathematical modeling

SPIE Journal Paper | 1 January 1993

Microscopic laser Doppler velocimeter for blood velocity measurement

Tomoaki Eiju, Masanori Nagai, Kiyofumi Matsuda, Junji Ohtsubo, Kazuhiro Homma, Kajuro Shimizu

OE, Vol. 32, Issue 01, (January 1993) https://doi.org/10.1117/12.10.1117/12.60070

KEYWORDS: Doppler effect, Velocity measurements, Blood circulation, Prisms, Laser Doppler velocimetry, Blood, Glasses, Particles, Light scattering, Scattering

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Proceedings Article | 1 November 1991 Paper

Real-time nonlinear optical correlator in speckle metrology

Akifumi Ogiwara, Junji Ohtsubo

Proceedings Volume 1564, (1991) https://doi.org/10.1117/12.49719

KEYWORDS: Fringe analysis, Sensors, Optical correlators, Speckle, Diffraction, Binary data, Visibility, Fourier transforms, Phase modulation, Signal detection

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SPIE Journal Paper | 1 October 1991

Speckle clipping correlation using various logical operation

Akifumi Ogiwara, Takaaki Suzuki, Junji Ohtsubo

OE, Vol. 30, Issue 10, (October 1991) https://doi.org/10.1117/12.10.1117/12.55960

KEYWORDS: Speckle, Correlation function, Signal detection, Logic, Signal processing, Signal to noise ratio, Computer simulations, Interfaces, Glasses, Lenses

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SPIE Journal Paper | 1 September 1991

Reconstruction of stellar image by phase retrieval based on Fourier decomposition method

Junji Ohtsubo, Yasusi Takahashi, Nobuharu Nakajima

OE, Vol. 30, Issue 09, (September 1991) https://doi.org/10.1117/12.10.1117/12.55930

KEYWORDS: Image filtering, Fourier transforms, Stars, Phase retrieval, Image restoration, Speckle interferometry, Image retrieval, Speckle, Image processing, Telescopes

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Proceedings Article | 27 December 1990 Paper

Real-time processor for stellar speckle interferometry using microchannel spatial light modulator

Junji Ohtsubo, Takeshi Utakouji, Tamiki Takemori, Katsuyoshi Fujita, Syuzo Isobe

Proceedings Volume 1347, (1990) https://doi.org/10.1117/12.23432

KEYWORDS: Speckle interferometry, Stars, Image processing, Speckle, Telescopes, Mirrors, Fringe analysis, Observatories, Fourier transforms, Image analysis

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