200 mJ半导体端面泵浦MOPA激光器研究

采用高功率激光二极管阵列(LDA)端面泵浦Nd:YAG激光棒方式, 结合凸凹非稳腔的设计，获得20 Hz运转条件下小束散角激光输出平均能量约为83 mJ。以该激光为振荡源，同样采用LDA端面泵浦Nd:YAG激光棒的方式进行能量放大，组成LDA端面泵浦振荡-放大(MOPA)激光器，最终获得重频频率20 Hz、平均能量＞200 mJ、发散角＜2.1 mrad、能量波动＜±2.5%的脉冲激光输出。该激光器光光转换效率约为14.6%，体积为175×91×49 mm3，质量＜1 kg，激光经8倍发射天线后发散角＜0.3 mrad。

Research on 200 mJ semiconductor end-pumped MOPA Laser

Using the high-power laser diode array (LDA) end-pumped Nd:YAG laser bar method, combined with the design of the convex-concave unstable cavity, the average energy of the small beam divergence laser output was achieved about 83 mJ under 20 Hz operating conditions. Then taking the laser as the oscillation source, the same method of the LDA end-pumped Nd:YAG laser rod was used for energy amplification to form an LDA end-pumped master oscillator-power amplification (MOPA) laser, which finally obtained the pulsed laser output with a repetitive frequency of 20 Hz, an average energy of >200 mJ, a divergence angle < 2.1 mrad and an energy fluctuation < ±2.5%. The laser has a optical-to-optical conversion efficiency of about 14.6%, a volume of 175×91×49 mm3, a mass of < 1 kg, and a divergence angle of < 0.3 mrad after transmitted through an 8× transmission antenna.