Dr. Youichi Bitou Profile

Dr. Youichi Bitou

at National Metrology Institute of Japan

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 21 August 2020 Presentation + Paper

Absolute flatness measurements by Fizeau interferometer and 3D scanning deflectometric profiler

Yohan Kondo, Youichi Bitou

Proceedings Volume 11492, 1149203 (2020) https://doi.org/10.1117/12.2570412

KEYWORDS: Autocollimators, Fizeau interferometers, Optical testing, 3D scanning, 3D metrology, Deflectometry, Calibration, Metrology, Interferometers

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Proceedings Article | 25 October 2016 Paper

λ/100 reference flat for commercially available Fizeau interferometer

Y. Kondo, Y. Bitou, Kazuhide Yamauchi

Proceedings Volume 9687, 968708 (2016) https://doi.org/10.1117/12.2242806

KEYWORDS: Fizeau interferometers, Finite element methods, Photography, Silicon, Measurement devices, Semiconducting wafers, Photomasks, Adhesives, Metrology, Geometrical optics

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Proceedings Article | 3 November 2011 Paper

Measurement of absolute optical thickness by wavelength tuning interferometer

Kenichi Hibino, Yangjin Kim, Youichi Bitou, Mamoru Mitsuishi

Proceedings Volume 8011, 80110B (2011) https://doi.org/10.1117/12.901637

KEYWORDS: Refractive index, Optical testing, Wavelength tuning, Phase measurement, Interferometers, Interferometry, Silica, Glasses, Beam splitters, Wafer-level optics

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Proceedings Article | 11 August 2008 Paper

Measurement of absolute optical thickness distribution of a mask-glass by wavelength tuning interferometry

Kenichi Hibino, Kim Yangjin, Youichi Bitou, Sonko Ohsawa, Naohiko Sugita, Mamoru Mitsuishi

Proceedings Volume 7063, 70630S (2008) https://doi.org/10.1117/12.797594

KEYWORDS: Refractive index, Interferometry, Optical testing, Phase measurement, Glasses, Wavelength tuning, Fizeau interferometers, Interferometers, Beam splitters, Ferroelectric materials

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Proceedings Article | 14 August 2006 Paper

Absolute interferometry for surface shapes with large steps by wavelength tuning with a mechanical phase shift

Kenichi Hibino, Yosuke Tani, Toshiyuki Takatsuji, Youichi Bitou, Shinichi Warisawa, Mamoru Mitsuishi

Proceedings Volume 6292, 62920Q (2006) https://doi.org/10.1117/12.679314

KEYWORDS: Interferometry, Ferroelectric materials, Phase shifts, Wavelength tuning, Phase measurement, Phase interferometry, Fizeau interferometers, Beam splitters, Profiling, Silica

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Proceedings Article | 18 August 2005 Paper

Phase-shifting laser diode interferometry with equal phase steps using a Fabry-Perot cavity

Youichi Bitou, Hajime Inaba, Feng-Lei Hong, Toshiyuki Takatsuji, Atsushi Onae

Proceedings Volume 5879, 58790Y (2005) https://doi.org/10.1117/12.613881

KEYWORDS: Fabry–Perot interferometers, Phase shifts, Interferometers, Modulation, Semiconductor lasers, Interferometry, Ferroelectric materials, Phase measurement, Phase interferometry, Mirrors

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SPIE Journal Paper | 1 April 2004

Two-dimensional holographic frequency-division demultiplexing using an acousto-optic modulator

Youichi Bitou

OE, Vol. 43, Issue 04, (April 2004) https://doi.org/10.1117/12.10.1117/1.1668283

KEYWORDS: Holography, Bragg cells, Diffraction, Multiplexing, Diffraction gratings, Adaptive optics, Holograms, 3D image reconstruction, Image transmission, Phase modulation

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SPIE Journal Paper | 1 April 2004

Rubidium-stabilized diode laser for high-precision interferometer

Youichi Bitou, Kaoru Sasaki, Hajime Inaba, Feng-Lei Hong, Atsushi Onae

OE, Vol. 43, Issue 04, (April 2004) https://doi.org/10.1117/12.10.1117/1.1666773

KEYWORDS: Laser development, Semiconductor lasers, Interferometers, Laser stabilization, Rubidium, Modulation, Absorption, Femtosecond phenomena, Light sources, Interferometry

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Proceedings Article | 20 November 2003 Paper

Simple rubidium stabilized diode laser for gauge block interferometer

Youichi Bitou, Hajime Inaba, Atsushi Onae

Proceedings Volume 5190, (2003) https://doi.org/10.1117/12.504025

KEYWORDS: Laser development, Semiconductor lasers, Interferometers, Modulation, Laser stabilization, Frequency modulation, Phase shift keying, Rubidium, Light sources, Absorption

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Proceedings Article | 22 October 2001 Paper

Gauge block interferometer using three frequency-stabilized lasers

Youichi Bitou, Akiko Hirai, Hideaki Yoshimori, Feng-Lei Hong, Yun Zhang, Atsushi Onae, Katuo Seta

Proceedings Volume 4401, (2001) https://doi.org/10.1117/12.445633

KEYWORDS: Interferometers, Semiconductor lasers, Helium neon lasers, Nd:YAG lasers, Laser stabilization, Fringe analysis, Laser development, Light sources, Modulation, Mirrors

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Proceedings Article | 3 May 2001 Paper

Frequency reproducibility of I2-stabilized Nd:YAG lasers

Feng-Lei Hong, Yun Zhang, Jun Ishikawa, Youichi Bitou, Atsushi Onae, Jun Yoda, Hirokazu Matsumoto, Kenichi Nakagawa

Proceedings Volume 4269, (2001) https://doi.org/10.1117/12.424464

KEYWORDS: Nd:YAG lasers, Laser stabilization, Iodine cells, Modulation, Iodine, Laser systems engineering, Crystals, Spectroscopy, Phase shift keying, Polarization

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Proceedings Article | 29 April 1999 Paper

High-speed incoherent-to-coherent image converter using GaAs

Youichi Bitou, Takumi Minemoto

Proceedings Volume 3729, (1999) https://doi.org/10.1117/12.346833

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SPIE Journal Paper | 1 April 1999

High-speed and high-contrast incoherent-to-coherent converter that uses a GaAs single crystal

Youichi Bitou, Yukihisa Osugi, Takumi Minemoto

OE, Vol. 38, Issue 04, (April 1999) https://doi.org/10.1117/12.10.1117/1.602114

KEYWORDS: Gallium arsenide, Crystals, Optically addressed spatial light modulators, Spatial light modulators, CCD cameras, Electrons, Modulation transfer functions, Image processing, Glasses, Coherent optics

Showing 5 of 13 publications

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