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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 5,
  • Issue S1,
  • pp. S111-S114
  • (2007)

Second harmonic generation of high peak power, high repetition rate from Yb-doped fiber amplifier

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Abstract

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.

© 2007 Chinese Optics Letters

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