Liu Gaoyou, Mi Shuyi, Yang Ke, Wei Disheng, Li Junhui, Yao Baoquan, Yang Chao, Dai Tongyu, Duan Xiaoming, Tian Lixin, Ju Youlun
Opt Lett. 2021 Jan 1;46(1):82-85. doi: 10.1364/OL.413755.
We demonstrated a high-power -switched two-stage Ho:YAG master-oscillator power-amplifier (MOPA) system dual-end pumped by Tm:YLF lasers. A new method was introduced by rotating and swapping spatial axial directions of pump beams to improve the beam quality of the Ho:YAG oscillator and first-stage amplifier. Two parallel second-stage Ho:YAG amplifiers were employed to output high power. A total maximum average output power of 332 W at 2091 nm with pulse repetition frequency of 20 kHz was achieved. Then a MOPA system was demonstrated using the Ho:YAG MOPA as the pump source. A maximum average output power of 161 W at 3-5 µm was obtained with 290 W incident Ho pump power, corresponding to beam quality factors of 3.42 and 3.83 for horizontal and vertical directions, respectively.
我们展示了一种由Tm:YLF激光器双端泵浦的高功率开关两级Ho:YAG主振荡功率放大器（MOPA）系统。通过旋转和交换泵浦光束的空间轴向方向引入了一种新方法，以提高Ho:YAG振荡器和第一级放大器的光束质量。采用两个平行的第二级Ho:YAG放大器来输出高功率。在2091nm处实现了332W的总最大平均输出功率，脉冲重复频率为20kHz。然后展示了一个以Ho:YAG MOPA作为泵浦源的MOPA系统。在290W的入射Ho泵浦功率下，在3 - 5μm处获得了161W的最大平均输出功率，水平和垂直方向的光束质量因子分别为3.42和3.83。
