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Dive into the research topics where Takashi Koseki is active.

Publication


Featured researches published by Takashi Koseki.


Optical Amplifiers and Their Applications (2003), paper MD14 | 2003

Time stability of 500mW 980nm pump laser module with polarization-maintaining fiber

Takeshi Koiso; Atsushi Okubo; Tsuyoshi Fujimoto; Yoshikazu Ikegami; Naoki Hayamizu; Takashi Koseki; Kevin Nishikata

We achieved excellent time stability at high power, 0.1% at 500mW, and a low variation of back facet monitor current, 1.6%, in 980nm pump laser modules. The laser structure was optimized by measuring relative intensity noise to control coherence-collapse phenomenon.


Archive | 2002

Mounting structure for semiconductor laser module

Takeshi Aikiyo; Toshio Kimura; Kohei Terada; Takahiro Okada; Takashi Koseki


Archive | 2000

Optical semiconductor module

Jun Miyokawa; Takashi Koseki; Toru Fukushima


Archive | 2003

Optical module mounted body and securing method of optical module

Masayuki Minamino; Takashi Koseki; Toru Fukushima


Archive | 2002

Semiconductor laser module, optical measuring method and optical measuring apparatus

Kohei Tsunetomo; Naoki Tsukiji; Junji Yoshida; Naoki Hayamizu; Takashi Koseki


Archive | 2002

Optical module, optical apparatus including optical module, and method for using optical module

Kaoru Iida; Takahiro Okada; Takashi Koseki; Masaru Saito; Jun Miyokawa; Toru Fukushima; Takeshi Aikiyo


Archive | 2001

Semiconductor laser module, and method for driving the semiconductor laser module

Takeshi Aikiyo; Chihomi Furuhashi; Takashi Koseki


Archive | 2002

Method for fixing optical module to printed circuit board

Toru Fukushima; Takashi Koseki; Masayuki Minamino; 南野 正幸; 古関 敬; 福島 徹


Archive | 2003

Series FOL0903m Mini-Pump Coolerless Laser Modules for Optical Amplifiers

Masayuki Minamino; Yuji Yamagata; Tomoya Kato; Takashi Koseki; Toru Fukushima


Archive | 2000

Semiconductor laser module and thermomodule

Takeshi Aikiyo; Chihomi Furuhashi; Takashi Koseki; 千穂美 古橋; 敬 古関; 武 愛清

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Toru Fukushima

The Furukawa Electric Co.

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Takeshi Aikiyo

The Furukawa Electric Co.

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Jun Miyokawa

The Furukawa Electric Co.

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Naoki Hayamizu

The Furukawa Electric Co.

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Takahiro Okada

The Furukawa Electric Co.

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Junji Yoshida

The Furukawa Electric Co.

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Kaoru Iida

The Furukawa Electric Co.

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Kohei Tsunetomo

The Furukawa Electric Co.

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