利用MOPA激光种子源, 结合氙灯泵浦行波放大方法研制了高能量脉宽可调1 064 nm波段激光器。激光器采用电调制脉宽方式控制MOPA光纤激光器脉冲信号的输出, 在保证高光束质量的前提下, 实现了脉宽8.6~220.9 ns可调的1 064 nm种子激光输出。选用双通放大级设计, 利用氙灯泵浦Nd:YAG晶体实现五级行波放大, 分析讨论了抑制自激振荡方法和行波放大过程中脉宽变窄的原因。当氙灯注入能量为60 J, 重复频率10 Hz时, 实现了脉宽调范围为4.2~173.3 ns的稳定1 064 nm激光输出, 单脉冲能量最高可达158 mJ。

The high energy pulse width tuning 1 064 nm solid-state laser was developed by adopting MOPA laser source and combining the traveling wave amplification of xenon-lamp pumping. The pulse signal out of MOPA fiber laser was controlled by the method of electric modulation pulse width. Under the premise of ensuring high beam quality, a 1 064 nm laser source output with pulse width of 8.6-220.9 ns was achieved. Adopting double pass amplifier design, five-step travelling wave amplification was achieved by xenon lamp pumping Nd:YAG crystal. The technique of restraining self-oscillations and the reasons of narrowing pulse width in the process of traveling wave amplification were analyzed. When the inject energy of xenon-lamp was 60 J and the repetition rate was 10 Hz, a 1 064 nm laser output with pulse width of 4.2-173.3 ns was achieved. Single pulse energy was up to 158 mJ.