Chinese Optics Letters, Volume. 5, Issue s1, 111(2007)
Second harmonic generation of high peak power, high repetition rate from Yb-doped fiber amplifier
A high peak power, high repetition rate master oscillator power amplifier (MOPA) system incorporating an Yb-doped fiber amplifier and its second harmonic generation (SHG) were investigated in detail. The oscillator is actively Q-switched microchip laser at repetition rate of 50 kHz with a pulse width of 2.8 ns. The amplifier employing Yb-doped polarization maintaining fiber and having a large mode area was excited by a laser diode with an optical power of 17 W. As results, the amplified average output power of 10 W and optical-optical conversion efficiency of 59% were achieved. In this MOPA system, experiments were performed by using KTP and LBO crystals. The conversion efficiency of 21% and 40%, SHG maximum power of 0.92 and 3.3 W were obtained for KTP and LBO crystals respectively.
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Hiroaki Sunaga, Ryusuke Horiuchi, Kazuya Jyosui, Kazuyoku Tei, Shigeru Yamaguchi, Kenzo Nanri, Tomoo Fujioka. Second harmonic generation of high peak power, high repetition rate from Yb-doped fiber amplifier[J]. Chinese Optics Letters, 2007, 5(s1): 111