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大口径ファイバーを用いた 高出力パルス Yb ファイバー …
Yb
1 1 1 1
23 23 4 35
High-Average-Power Yb-Doped Pulse Fiber Laser Used in Large Core Fiber
Hidetsugu YOSHIDA 1, , Koji TSUBAKIMOTO 1, Hisanori FUJITA 1, Noriaki MIYANAGA 1,
Takeshi YAMAMURA 2, 3, Tomokazu SAKAGAWA 2, 3, Masahiro TSUKAMOTO 4 and Akira FUJISAKI 3, 5
An excellent beam quality under high-average-power operation can be obtained from a fiber laser
because the thermal e›ect in fiber laser is smaller than that of a YAG laser. The spectral combination
of four nanosecond pulsed fiber amplifiers has been demonstrated, and an output power of over 1.1 kW
was achieved. Sub 25 fs pulse at an average power of 250 W was obtained from a high-power fiber CPA
system. Recent development in PCF rod-type Yb-fiber and high power laser diode technology, few
hundred watts of pulsed fiber laser systems have been developed. We have developed a high-peak and
high-average-power polarization-maintained Yb-doped PCF rod fiber laser system. The output power of
393 W pulse energy: 1.3 mJ, peak power: 94 kWat a repetition rate of 300 kHz was obtained by a 40-
m m PCF-LMA fiber and a 100-m m PCF-rod type fiber.
Key words: Yb-doped femtosecond fiber laser, large core fiber laser, photonic crystal fiber PCF,
rod-type fiber, high-average-power
6 kW
50 kW 23
100 kW
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