Prof. Takashi Okamoto Profile

Prof. Takashi Okamoto

Professor at Kyushu Institute of Technology

SPIE Involvement:

Author

Area of Expertise:

random laser , light scattering , laser speckle

Websites:

Personal Website

Publications (18)

Proceedings Article | 20 September 2023 Paper

Emission properties of random lasers with scatterer distribution formed by optical trapping

Takashi Kaku, Naomichi Yokoi, Takashi Okamoto

Proceedings Volume 12606, 126060M (2023) https://doi.org/10.1117/12.3008339

KEYWORDS: Random lasers, Atmospheric particles, Optical tweezers, Laser scattering, Emission spectrum, Particles, Inhomogeneities, Ocean optics, Light scattering, Bioalcohols

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Proceedings Article | 9 December 2015 Paper

Assessment of laser speckle flowgraphy: Development of novel cutaneous blood flow measurement technique

Yoshinao Nagashima, Yuko Ohsugi, Yoshifumi Niki, Kouji Maeda, Takashi Okamoto

Proceedings Volume 9792, 979218 (2015) https://doi.org/10.1117/12.2203712

KEYWORDS: Blood circulation, Speckle, Time division multiplexing, Imaging spectroscopy, Laser development, Biomedical optics, Charge-coupled devices, Measurement devices, Diffusion, Skin, Blood, Speckle pattern, Calibration, Motion measurement, Video

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SPIE Journal Paper | 22 May 2013 Open Access

Monte Carlo simulation of light reflection from cosmetic powder particles near the human skin surface

Takashi Okamoto, Tatsuya Kumagawa, Masafumi Motoda, Takanori Igarashi, Keisuke Nakao

JBO, Vol. 18, Issue 06, 061232, (May 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.6.061232

KEYWORDS: Particles, Skin, Monte Carlo methods, Scattering, Reflection, Light scattering, Refractive index, Reflectivity, Absorption, Color difference

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Proceedings Article | 16 June 2011 Paper

Monte Carlo simulation of light reflection from cosmetic powders on the skin

Takashi Okamoto, Masafumi Motoda, Takanori Igarashi, Keisuke Nakao

Proceedings Volume 8090, 809015 (2011) https://doi.org/10.1117/12.889756

KEYWORDS: Skin, Particles, Light scattering, Monte Carlo methods, Reflection, Scattering, Color difference, Refractive index, Tissue optics, Spherical lenses

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Proceedings Article | 14 September 2010 Paper

Optimal sampling and quantization of dynamic speckles for object identification

Takashi Okamoto, Jun Mizobe

Proceedings Volume 7387, 738702 (2010) https://doi.org/10.1117/12.870723

KEYWORDS: Quantization, Speckle, Interference (communication), Laser scattering, Computer simulations, Signal detection, Binary data, Scattering, Speckle pattern, 3D modeling

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Proceedings Article | 18 November 2008 Paper

Light scattering properties of random media with a structure of laser speckle

Takashi Okamoto, Masaki Miyamoto, Sou Tanaka

Proceedings Volume 7138, 71380V (2008) https://doi.org/10.1117/12.817995

KEYWORDS: Speckle, Light scattering, Laser scattering, Scattering, Refractive index, Random lasers, Polymers, Diffusers, Holography, Lithography

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Proceedings Article | 10 April 2007 Paper

Statistical properties of superposed fractal speckle fields

Takashi Okamoto

Proceedings Volume 6613, 66130E (2007) https://doi.org/10.1117/12.739966

KEYWORDS: Speckle, Fractal analysis, Speckle pattern, Diffusers, Correlation function, Polymers, Gaussian beams, Polarization, Random lasers, Statistical analysis

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Proceedings Article | 15 September 2006 Paper

Correlation properties of three-dimensional superposed fractal speckle distributions

Takashi Okamoto, Takuya Moriyama, Shuhei Fujita

Proceedings Volume 6341, 634102 (2006) https://doi.org/10.1117/12.695252

KEYWORDS: Speckle, Fractal analysis, Speckle pattern, Diffusers, Correlation function, Random lasers, Statistical analysis, Polarization, Gaussian beams, Computer simulations

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Proceedings Article | 14 June 2006 Paper

Intensity correlation of orthogonally crossed speckle waves

Takashi Okamoto

Proceedings Volume 6254, 625403 (2006) https://doi.org/10.1117/12.679898

KEYWORDS: Speckle, Fractal analysis, Speckle pattern, Photopolymers, Diffusers, Correlation function, Statistical analysis, Gaussian beams, Random lasers, Light scattering

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Proceedings Article | 19 November 2003 Paper

Spatial properties of light scattering fields produced by crossed random waves

Takashi Okamoto, Hiroyuki Gotou

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.526943

KEYWORDS: Speckle, Light scattering, Random lasers, Laser scattering, Scattering, Photopolymers, Correlation function, Light wave propagation, Anisotropy, Atmospheric particles

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Proceedings Article | 8 May 2001 Paper

Correlation properties of light multiply scattered from powders

Takashi Okamoto, Shuta Yanagita

Proceedings Volume 4416, (2001) https://doi.org/10.1117/12.426998

KEYWORDS: Particles, Speckle pattern, Light scattering, Speckle, Scattering, Charge-coupled devices, Helium neon lasers, Aluminum, Diffusers, Multiple scattering

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Proceedings Article | 19 July 1999 Paper

Influence of objects buried in highly dense media on angular correlations of the scattered intensity

Suguru Sangu, Takashi Okamoto, Jun Uozumi, Toshimitsu Asakura

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354951

KEYWORDS: Correlation function, Light scattering, Scattering, Numerical simulations, Solids, Fourier transforms, Control systems, Data hiding, Multiple scattering, Tumors

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Proceedings Article | 19 July 1999 Paper

Light amplification by multilayers with fractal gain structures

Takashi Okamoto

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.355039

KEYWORDS: Fractal analysis, Geometrical optics, Interference filters, Optical amplifiers, Refractive index, Photonic crystals, Dielectrics, Active optics, Optical filters, Nonlinear filtering

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Proceedings Article | 7 May 1999 Paper

Angular correlation properties of multiply scattered light in random media with buried objects

Suguru Sangu, Takashi Okamoto, Jun Uozumi, Toshimitsu Asakura

Proceedings Volume 3740, (1999) https://doi.org/10.1117/12.347787

KEYWORDS: Light scattering, Correlation function, Scattering, Numerical simulations, Fourier transforms, Diffusion, Solids, Multiple scattering, Biomedical optics, Optical storage

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Proceedings Article | 1 September 1996 Paper

Enhanced backscattering of light by disordered media: effects of spatial coherence

Takashi Okamoto

Proceedings Volume 2778, 27785K (1996) https://doi.org/10.1117/12.2299083

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SPIE Journal Paper | 1 January 1993

Speckle correlation method for the real time measurement of motion paths using liquid crystal television

Takashi Okamoto, Yuuki Egawa, Toshimitsu Asakura

OE, Vol. 32, Issue 01, (January 1993) https://doi.org/10.1117/12.10.1117/12.60069

KEYWORDS: Speckle pattern, Motion measurement, Speckle, Televisions, Phase modulation, Liquid crystals, Time metrology, Calibration, Photography, Photomultipliers

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Proceedings Article | 1 March 1991 Paper

Detection of the object velocity using the time-varying scattered speckles

Takashi Okamoto, Toshimitsu Asakura

Proceedings Volume 1399, (1991) https://doi.org/10.1117/12.26103

KEYWORDS: Diffusers, Speckle, Speckle pattern, Gaussian beams, Scattering, Light scattering, Laser scattering, Statistical analysis, Imaging systems, Distance measurement

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Proceedings Article | 1 July 1990 Paper

Velocity dependence of doubly scattered speckles produced by a cascade of two moving diffusers

Takashi Okamoto, Toshimitsu Asakura

Proceedings Volume 1319, (1990) https://doi.org/10.1117/12.34844

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Showing 5 of 18 publications

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