Zhao Zhigang, Xuan Hongwen, Igarashi Hironori, Ito Shinji, Kakizaki Kouji, Kobayashi Yohei
Opt Express. 2015 Nov 16;23(23):29764-71. doi: 10.1364/OE.23.029764.
A 1553 nm Er-doped fiber master-oscillator-power-amplifier (MOPA) laser system providing pulses with a 6 kHz repetition rate, 5 ns duration, ~210 μJ energy, ~300 MHz linewidth, and with a near diffraction limited beam quality, was developed. A gain fiber as short as 0.7 m in length was utilized in order to relax the SBS effect. To the best of our knowledge, thus generated peak power of 40 kW is the highest one obtained from a single frequency Er-doped silica fiber laser. The pulse quality was verified by frequency conversion with a periodically poled lithium niobate nonlinear crystal (PPLN) for second harmonic generation. A pulse energy as high as ~100 μJ was achieved at 776.6 nm with a moderate incident energy of 133 μJ, indicating an energy conversion efficiency of 75%.
开发了一种1553纳米掺铒光纤主振荡功率放大器（MOPA）激光系统，该系统能产生重复频率为6千赫兹、脉宽为5纳秒、能量约为210微焦、线宽约为300兆赫兹且光束质量接近衍射极限的脉冲。使用了长度仅为0.7米的增益光纤，以缓解受激布里渊散射（SBS）效应。据我们所知，由此产生的40千瓦峰值功率是从单频掺铒石英光纤激光器获得的最高峰值功率。通过使用周期性极化铌酸锂非线性晶体（PPLN）进行频率转换以产生二次谐波，验证了脉冲质量。在776.6纳米处，以133微焦的适中入射能量实现了高达约100微焦的脉冲能量，表明能量转换效率为75%。
