Dr. Yuji Yamagata Profile

Dr. Yuji Yamagata

at FUJIKURA Ltd

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 2 March 2020 Paper

Highly efficient 9xx-nm band single emitter laser diodes optimized for high output power operation

Yuji Yamagata, Yoshikazu Kaifuchi, Ryozaburo Nogawa, Kyohei Yoshida, Rintaro Morohashi, Masayuki Yamaguchi

Proceedings Volume 11262, 1126203 (2020) https://doi.org/10.1117/12.2545721

KEYWORDS: Resistance, Waveguides, Semiconductor lasers, Doping, Absorption, Reliability, Failure analysis, Electroluminescence, Structural design, Fiber lasers

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Proceedings Article | 4 March 2019 Presentation + Paper

Enhanced power conversion efficiency in 900-nm range single emitter broad stripe laser diodes maintaining high power operability

Yoshikazu Kaifuchi, Kyohei Yoshida, Yuji Yamagata, Ryozaburo Nogawa, Yumi Yamada, Masayuki Yamaguchi

Proceedings Volume 10900, 109000F (2019) https://doi.org/10.1117/12.2509184

KEYWORDS: Semiconductor lasers, High power lasers, Active optics, Fiber lasers, Laser systems engineering

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Proceedings Article | 19 February 2018 Paper

High polarization purity operation of 99% in 9xx-nm broad stripe laser diodes

Rintaro Morohashi, Yuji Yamagata, Yoshikazu Kaifuchi, Katsuhisa Tada, Ryozaburo Nogawa, Yumi Yamada, Masayuki Yamaguchi

Proceedings Volume 10514, 105140B (2018) https://doi.org/10.1117/12.2288157

KEYWORDS: Polarization, Semiconductor lasers, High power lasers, Near field, Waveguides, Metalorganic chemical vapor deposition

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Proceedings Article | 22 February 2017 Presentation + Paper

High-brightness and high-efficiency fiber-coupled module for fiber laser pump with advanced laser diode

Yohei Kasai, Yuji Yamagata, Yoshikazu Kaifuchi, Akira Sakamoto, Daiichiro Tanaka

Proceedings Volume 10086, 1008606 (2017) https://doi.org/10.1117/12.2252122

KEYWORDS: Semiconductor lasers, Fiber lasers, Laser development, Multiplexing, Thermal effects, Fiber couplers, Polarization, Laser systems engineering, Optical simulations, Optical pumping, Mirrors, Dielectric polarization, High power lasers, Diodes, High power fiber lasers

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Proceedings Article | 22 February 2017 Presentation + Paper

Ultimate high power operation of 9xx-nm single emitter broad stripe laser diodes

Yoshikazu Kaifuchi, Yuji Yamagata, Ryozaburo Nogawa, Rintaro Morohashi, Yumi Yamada, Masayuki Yamaguchi

Proceedings Volume 10086, 100860D (2017) https://doi.org/10.1117/12.2251145

KEYWORDS: High power lasers, Semiconductor lasers, Fiber lasers, Resistance, Laser development, Waveguides, Indium gallium arsenide, Light sources, Reliability

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Proceedings Article | 4 March 2016 Paper

High-brightness laser diode module over 300W with 100µm/Na 0.22 fiber

Yohei Kasai, Shinichi Sakamoto, Yukihiko Takahashi, Ken Katagiri, Yuji Yamagata, Akira Sakamoto, Daiichiro Tanaka

Proceedings Volume 9733, 973309 (2016) https://doi.org/10.1117/12.2211985

KEYWORDS: Semiconductor lasers, Fiber coupled lasers, High power fiber lasers, Multiplexing, Diodes, Integrated optics, Reliability, Laser development, Fiber lasers, Optical design, Resistance, Optical alignment, Heatsinks, Optical damage

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Proceedings Article | 13 March 2015 Paper

915nm high-power broad area laser diodes with ultra-small optical confinement based on Asymmetric Decoupled Confinement Heterostructure (ADCH)

Yuji Yamagata, Yumi Yamada, Masanori Muto, Syunta Sato, Ryozaburo Nogawa, Akira Sakamoto, Masayuki Yamaguchi

Proceedings Volume 9348, 93480F (2015) https://doi.org/10.1117/12.2078698

KEYWORDS: High power lasers, Reliability, Semiconductor lasers, Active optics, Heterojunctions, Fiber lasers, Laser systems engineering, Absorption, Broad area laser diodes, Absorbance

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Showing 5 of 7 publications

Conference Committee Involvement (3)

High-Power Diode Laser Technology XXIII

25 January 2025 | San Francisco, California, United States

High-Power Diode Laser Technology XXII

28 January 2024 | San Francisco, California, United States

High-Power Diode Laser Technology XXI

29 January 2023 | San Francisco, California, United States

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