Dr. Kazuue Fujita Profile

Dr. Kazuue Fujita

Associate Senior Researcher at Hamamatsu Photonics KK

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Author

Publications (11)

Proceedings Article | 9 March 2024 Presentation

An external cavity nonlinear quantum cascade laser with high mid-infrared to terahertz conversion efficiency in the frequency of 1.2-4.5 THz tuning range

Shohei Hayashi, Atsushi Nakanishi, Tatsuo Dougakiuchi, Akio Ito, Masahiro Hitaka, Kazuue Fujita

Proceedings Volume PC12895, PC128950F (2024) https://doi.org/10.1117/12.3001178

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Mid-IR, Quantum frequencies, Laser frequency, Quantum efficiency, Quantum conversion, External quantum efficiency, Terahertz technology, Difference frequency generation

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Proceedings Article | 8 March 2024 Presentation + Paper

Electrical flicker-noise analysis based on trapping and de-trapping model in quantum-cascade detectors

T. Dougakiuchi, K. Fujita, Y. Kadoya

Proceedings Volume 12895, 128950I (2024) https://doi.org/10.1117/12.3000104

KEYWORDS: Sensors, Photovoltaic detectors, Quantum detection, Temperature metrology, Resistance, Quantum noise, Infrared sensors, Signal to noise ratio, Quantum cascade lasers, Instrument modeling

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Proceedings Article | 15 March 2023 Presentation + Paper

Lens-coupled sub-THz and THz quantum cascade laser sources based on intra-cavity frequency mixing

Shohei Hayashi, Akio Ito, Tatsuo Dougakiuchi, Masahiro Hitaka, Atsushi Nakanishi, Kazuue Fujita

Proceedings Volume 12430, 1243007 (2023) https://doi.org/10.1117/12.2648566

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Silicon

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Proceedings Article | 2 March 2020 Presentation + Paper

Terahertz imaging with nonlinear quantum-cascade-laser source

Atsushi Nakanishi, Kazuue Fujita, Hiroshi Satozono

Proceedings Volume 11279, 1127915 (2020) https://doi.org/10.1117/12.2543450

KEYWORDS: Terahertz radiation, Millimeter wave imaging, Quantum cascade lasers, Imaging systems, Semiconductors, Nondestructive evaluation, Spectroscopy

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Proceedings Article | 18 November 2019 Paper

Room-temperature monolithic quantum-cascade laser sources operating from 1.1 to 1.5 THz

Kazuue Fujita, Shohei Hayashi, Masahiro Hitaka, Akio Ito, Tatsuo Dougakiuchi, Wei Dong, Hiroyasu Fujiwara

Proceedings Volume 11196, 111960P (2019) https://doi.org/10.1117/12.2536271

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Difference frequency generation, Semiconductors, Light sources, Phase matching, Imaging spectroscopy, Spectroscopes, Light emitting diodes, Nonlinear optics

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Proceedings Article | 26 January 2018 Paper

Development of THz light sources based on QCL technology

Kazuue Fujita, Akio Ito, Masahiro Hitaka, Tatsuo Dougakiuchi, Tadataka Edamura

Proceedings Volume 10540, 105401J (2018) https://doi.org/10.1117/12.2287685

KEYWORDS: Terahertz radiation, Mid-IR, Continuous wave operation, Quantum cascade lasers, Light sources

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Proceedings Article | 20 February 2017 Paper

Narrow-linewidth ultra-broadband terahertz sources based on difference-frequency generation in mid-infrared quantum cascade lasers

Seungyong Jung, Yifan Jiang, Jae Hyun Kim, Luigi Consolino, Saverio Bartalini, Paolo De Natale, Miriam Vitello, Kazuue Fujita, Masahiro Hitaka, Akio Ito, Jeremy Kirch, Dan Botez, Frederic Demmerle, Gerhard Boehm, Markus-Christian Amann, Mikhail Belkin

Proceedings Volume 10123, 1012315 (2017) https://doi.org/10.1117/12.2256099

KEYWORDS: Continuous wave operation, Waveguides, Semiconducting wafers, Quantum cascade lasers, Terahertz radiation, Mid-IR, Quantum efficiency, Terahertz sources, Difference frequency generation, Nonlinear optics, Frequency conversion, Silicon, Semiconductor lasers

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Proceedings Article | 27 January 2017 Presentation + Paper

High photoresponse in room-temperature quantum cascade detectors based on a coupled-well design

T. Dougakiuchi, K. Fujita, T. Hirohata, A. Ito, M. Hitaka, T. Edamura

Proceedings Volume 10111, 101112D (2017) https://doi.org/10.1117/12.2250468

KEYWORDS: Sensors, Quantum chromodynamics, Absorption, Quantum cascade lasers, Waveguides, Temperature metrology, Laser spectroscopy, Absorption spectroscopy, Optical amplifiers, Photonics

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Proceedings Article | 4 March 2013 Paper

Extremely temperature-insensitive continuous-wave broadband quantum cascade lasers

Kazuue Fujita, Masamichi Yamanishi, Shinichi Furuta, Tatsuo Dougakiuchi, Atsushi Sugiyama, Tadataka Edamura

Proceedings Volume 8640, 86400R (2013) https://doi.org/10.1117/12.2003241

KEYWORDS: Quantum cascade lasers, Continuous wave operation, Laser damage threshold, Quantum wells, Laser applications, Pulsed laser operation, Temperature metrology, Absorption, Mirrors, Mid-IR

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Proceedings Article | 9 February 2012 Paper

Broadband continuous-wave tuning of external cavity anticrossed dual-upper-state quantum cascade lasers

Tatsuo Dougakiuchi, Kazuue Fujita, Tadataka Edamura, Masamichi Yamanishi, Shinichi Furuta, Atsushi Sugiyama

Proceedings Volume 8277, 82770V (2012) https://doi.org/10.1117/12.907535

KEYWORDS: Continuous wave operation, Electroluminescence, Quantum cascade lasers, Pulsed laser operation, Wavelength tuning, Semiconductor lasers, Light sources, Spectroscopy, Laser damage threshold, Silicon

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Proceedings Article | 3 February 2009 Paper

Quantum cascade lasers based on single phonon-continuum depopulation structures

Kazuue Fujita, Tadataka Edamura, Naota Akikusa, Atsushi Sugiyama, Takahide Ochiai, Shinichi Furuta, Akio Ito, Masamichi Yamanishi, Hirofumi Kan

Proceedings Volume 7230, 723016 (2009) https://doi.org/10.1117/12.808355

KEYWORDS: Continuous wave operation, Quantum cascade lasers, Laser damage threshold, Pulsed laser operation, Silicon, Gold, Mid-IR, Phonons, Scattering

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Showing 5 of 11 publications

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