Mr. Michihiro Nakai Profile

Michihiro Nakai

at Fujikura Ltd

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Proceedings Article | 22 February 2007 Paper

30W Q-SW fiber laser

Michihiro Nakai, Kensuke Shima, Manabu Saito, Tomoharu Kitabayashi

Proceedings Volume 6453, 645319 (2007) https://doi.org/10.1117/12.701588

KEYWORDS: Fiber lasers, Pulsed laser operation, Molybdenum, Oscillators, Optical pumping, Materials processing, Cladding, Capillaries, Laser processing, Semiconductor lasers

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We present an adaptive and robust pulse-operated high power fiber laser, which has an average output power of 30 W. The fiber laser realizes flexible pulse duration without changing a repetition rate and an average power, which is desirable for laser processing, by employing a Q-switched (Q-SW) Master Oscillator Power Amplifier(MOPA). For instance, its pulse duration is controllable in the range of 50 ns to 100 ns at 50 kHz in repetition rate. In addition to the flexible pulse duration, the fiber laser provides high powers, a peak power of 27 kW at 30 kHz in repetition rate and an average power of 30 W at 50 kHz in repetition rate. Large mode area (LMA) fibers and end pumping structure in the laser also contribute the above mentioned features, pulse adaptiveness and high output power. In terms of the robustness of the laser, we employ newly-developed reflection-suppressing pump combiners, which protect pump laser diodes (LDs) from amplified reflected signal light from objectives. All those features make the fiber laser a more practical light source for laser processing.

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