Mi Shuyi, Tang Jinwen, Wei Disheng, Yao Baoquan, Li Junhui, Yang Ke, Dai Tongyu, Duan Xiaoming
Opt Express. 2022 Jun 6;30(12):21501-21511. doi: 10.1364/OE.462617.
We demonstrated an efficient, high-power Ho:YAG master-oscillator power amplifier (MOPA) system and investigated its thermal-birefringence-induced depolarization. The maximum output power was 450 W with a depolarized power of 32.1 W and depolarization of 0.071 via three power amplifiers. To our knowledge, this is the highest average power generated from a Ho:YAG MOPA system. In theory, a simplified model was built to calculate the depolarization in the amplifier, and the theoretical results agreed with the actual value well. Moreover, the overall optical-to-optical efficiency of the MOPA system was near 60%, and the beam quality M factors of s-polarized laser were measured to be ∼ 1.8 at 400 W. In pulse operation, the per pulse energy was ∼ 11 mJ at the pulse repetition frequency of 40 kHz with the corresponding peak power of 220 kW.
我们展示了一种高效、高功率的Ho:YAG主振荡功率放大器（MOPA）系统，并研究了其热双折射引起的去极化现象。通过三个功率放大器，最大输出功率为450 W，去极化功率为32.1 W，去极化率为0.071。据我们所知，这是从Ho:YAG MOPA系统产生的最高平均功率。理论上，建立了一个简化模型来计算放大器中的去极化，理论结果与实际值吻合良好。此外，MOPA系统的整体光光效率接近60%，在400 W时，s偏振激光的光束质量M因子测量值约为1.8。在脉冲操作中，脉冲重复频率为40 kHz时，每个脉冲能量约为11 mJ，相应的峰值功率为220 kW。
