Dr. Kohei Doi Profile

Dr. Kohei Doi

Student at Univ of Toyama

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Author

Publications (16)

Proceedings Article | 23 February 2018 Paper

Physical-random number generator using an oscillation frequency stabilized laser diode

Kyohei Hirai, Toshihiro Taoka, Takashi Sato, Kohei Doi, Yasuo Ohdaira, Shuichi Sakamoto, Masashi Ohkawa

Proceedings Volume 10526, 105260E (2018) https://doi.org/10.1117/12.2288035

KEYWORDS: Semiconductor lasers, Signal detection, Absorption, Laser stabilization, Rubidium, Modulation, Interference (communication), Amplifiers, Signal processing, Neodymium

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SPIE Journal Paper | 9 June 2017 Open Access

Study on the resolution improvement of a range finder using the chaotic frequency characteristics of a laser diode

Takahiro Saito, Shinya Maehara, Kohei Doi, Takashi Sato, Yasuo Ohdaira, Shuichi Sakamoto, Masashi Ohkawa

OE, Vol. 56, Issue 06, 064101, (June 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.6.064101

KEYWORDS: Semiconductor lasers, Frequency modulation, Mirrors, Interference (communication), Fabry–Perot interferometers, Spectral resolution

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Proceedings Article | 1 September 2015 Paper

Optical range finder using semiconductor laser frequency noise

T. Saito, K. Kondo, Y. Tokutake, S. Maehara, K. Doi, H. Arai, T. Sato, M. Ohkawa, Y. Ohdaira, S. Sakamoto

Proceedings Volume 9576, 95760N (2015) https://doi.org/10.1117/12.2187963

KEYWORDS: Semiconductor lasers, Distance measurement, Absorption, Modulation, Rubidium, Signal detection, Interference (communication), Oscilloscopes, Laser optics, Semiconductors

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SPIE Journal Paper | 7 January 2013 Open Access

Frequency noise characteristics of a diode laser and its application to physical random number generation

Shinya Maehara, Kohei Kawakami, Hideaki Arai, Kenji Nakano, Kohei Doi, Takashi Sato, Yasuo Ohdaira, Shuichi Sakamoto, Masashi Ohkawa

OE, Vol. 52, Issue 01, 014302, (January 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.1.014302

KEYWORDS: Semiconductor lasers, Absorption, Binary data, Interference (communication), Rubidium, Fabry–Perot interferometers, Optical engineering, Sensors, Signal detection, Optical amplifiers

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Proceedings Article | 29 February 2012 Paper

Fast random-number generation using a diode laser's frequency noise characteristic

Hiroki Takamori, Kohei Doi, Shinya Maehara, Kohei Kawakami, Takashi Sato, Masashi Ohkawa, Yasuo Ohdaira

Proceedings Volume 8255, 825521 (2012) https://doi.org/10.1117/12.908011

KEYWORDS: Semiconductor lasers, Binary data, Diodes, Fabry–Perot interferometers, Interference (communication), Vertical cavity surface emitting lasers, Signal detection, Rubidium, Absorption, Sensors

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Proceedings Article | 29 February 2012 Paper

Oscillation frequency stabilization and narrowing of a laser diode by using an external cavity

Minoru Iwahori, Kohei Doi, Hideaki Arai, Takashi Sato, Masashi Ohkawa

Proceedings Volume 8255, 825529 (2012) https://doi.org/10.1117/12.909622

KEYWORDS: Semiconductor lasers, Vertical cavity surface emitting lasers, Laser stabilization, Optical communications, Singular optics, Telecommunications, Laser optics, Beam splitters, Laser systems engineering, Laser applications

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Proceedings Article | 29 February 2012 Paper

Oscillation wavelength shifts observed in vertical cavity surface emitting lasers exposed to magnetic fields

Y. Yamagishi, S. Tabira, Y. Matsumoto, K. Doi, T. Sato, M. Okawa

Proceedings Volume 8255, 825522 (2012) https://doi.org/10.1117/12.908016

KEYWORDS: Magnetism, Vertical cavity surface emitting lasers, Semiconductor lasers, Monochromators, Fabry–Perot interferometers, Diodes, Mirrors, Spectral resolution, Beam splitters, Avalanche photodetectors

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Proceedings Article | 21 February 2011 Paper

Super fast physical-random number generation using laser diode frequency noises

Tetsuro Ushiki, Kohei Doi, Shinya Maehara, Takashi Sato, Masashi Ohkawa, Yasuo Ohdaira

Proceedings Volume 7933, 79332F (2011) https://doi.org/10.1117/12.875830

KEYWORDS: Semiconductor lasers, Binary data, Interference (communication), Diodes, Absorption, Rubidium, Computer security, Fabry–Perot interferometers, Sensors, Avalanche photodetectors

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Proceedings Article | 26 February 2010 Paper

VCSEL's frequency stabilization of an external cavity diode laser: countermeasures against atmospheric temperature variations

Mutsuki Motojima, Kohei Doi, Takashi Sato, Masashi Ohkawa, Takamasa Suzuki

Proceedings Volume 7597, 75972A (2010) https://doi.org/10.1117/12.840609

KEYWORDS: Semiconductor lasers, Vertical cavity surface emitting lasers, Laser stabilization, Telecommunications, Optical communications, Signal detection, Fabry–Perot interferometers, Singular optics, Laser systems engineering, Mirrors

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Proceedings Article | 26 February 2010 Paper

Physical-random number generation using laser diodes' inherent noises

Hiroki Nishimura, Kohei Doi, Tetsurou Ushiki, Takashi Sato, Masashi Ohkawa, Yasuo Odaira

Proceedings Volume 7597, 75970M (2010) https://doi.org/10.1117/12.840626

KEYWORDS: Semiconductor lasers, Binary data, Fermium, Frequency modulation, Laser damage threshold, Fabry–Perot interferometers, Computer security, Interference (communication), Refractive index, Sensors

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SPIE Journal Paper | 1 January 2010

Double optical feedback system for a single-mode vertical-cavity surface-emitting laser

Kohei Doi, Takashi Sato, Masashi Ohkawa

OE, Vol. 49, Issue 01, 014202, (January 2010) https://doi.org/10.1117/12.10.1117/1.3284784

KEYWORDS: Vertical cavity surface emitting lasers, Semiconductor lasers, Mirrors, Singular optics, Telecommunications, Optical engineering, Control systems, Optical communications, Laser optics, Laser stabilization

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Proceedings Article | 12 July 2008 Paper

Frequency stabilization of semiconductor lasers for onboard interferometers using both Rb-saturated absorption profiles and double-optical feedback systems

K. Nakano, S. Maehara, M. Yanagisawa, A. Sato, K. Doi, T. Sato, M. Ohkawa, T. Maruyama, S. Kawamura

Proceedings Volume 7010, 701047 (2008) https://doi.org/10.1117/12.788681

KEYWORDS: Absorption, Rubidium, Semiconductor lasers, Avalanche photodetectors, Absorption spectroscopy, Laser stabilization, Mirrors, Gadolinium, Signal detection, Diodes

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Proceedings Article | 29 February 2008 Paper

Frequency stabilization of an external cavity diode laser: countermeasures against atmospheric temperature variations

Yuta Minabe, Kohei Doi, Takashi Sato, Takeo Maruyama, Masashi Ohkawa, Tsuneya Tsubokawa

Proceedings Volume 6889, 688918 (2008) https://doi.org/10.1117/12.761598

KEYWORDS: Semiconductor lasers, Vertical cavity surface emitting lasers, Laser stabilization, Temperature metrology, Singular optics, Control systems, Fabry–Perot interferometers, Diffraction gratings, Diodes, Optical testing

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Proceedings Article | 24 January 2008 Paper

Frequency stabilization of a semiconductor laser using both Rb saturated absorption profiles and double optical feedback systems

K. Nakano, S. Maehara, M. Yanagisawa, K. Doi, T. Sato, M. Ohkawa, T. Maruyama, S. Kawamura

Proceedings Volume 6829, 68290R (2008) https://doi.org/10.1117/12.756173

KEYWORDS: Rubidium, Absorption, Semiconductor lasers, Laser stabilization, Absorption spectroscopy, Mirrors, Gadolinium, Doppler effect, Signal detection, Chemical species

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Proceedings Article | 22 March 2007 Paper

Compact double optical feedback external-cavity diode laser system and its frequency stabilization

Kohei Doi, Yuta Minabe, Takashi Sato, Takeo Maruyama, Masashi Ohkawa, Tsuneya Tsubokawa

Proceedings Volume 6468, 64680E (2007) https://doi.org/10.1117/12.698961

KEYWORDS: Semiconductor lasers, Laser stabilization, Diffraction gratings, Satellites, Laser systems engineering, Singular optics, Laser applications, Telecommunications, Observatories, Reflectors

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Proceedings Article | 28 February 2006 Paper

Evaluation of frequency stability in double optical feedback ECDL systems

Kohei Doi, Yumie Kobayashi, Shinya Maehara, Takashi Sato, Takeo Maruyama, Masashi Ohkawa, Tsuneya Tsubokawa

Proceedings Volume 6115, 61150O (2006) https://doi.org/10.1117/12.645759

KEYWORDS: Semiconductor lasers, Rubidium, Laser stabilization, Absorption, Satellites, Laser systems engineering, Active optics, Telecommunications, Singular optics, Interferometers

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Showing 5 of 16 publications

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