针对近年来发展的激光冲击强化技术，采用1级谐振8级放大的系统结构和模块化设计方法，研制出了激光冲击强化用短脉宽、大能量的Nd:YAG脉冲激光器，并对激光器技术指标进行了测试分析。在预热20 min后、环境温度变化小于2 ℃的情况下，单脉冲最大输出能量高达25 J，能量不稳定度小于3%，脉宽16~20 ns可调，脉宽不稳定度小于±1 ns，光束发散角小于等于2.5 mrad，重复频率达5 Hz。对TC4钛合金进行激光冲击强化实验，大幅度提高了TC4钛合金试件表面的残余压应力。结果表明，研制的激光器各项性能良好。

The laser peening technology is a recentlydeveloped surface treatment method. Using an oscillation eightstage amplified system structure and the modular design method, a short pulse and high power Nd:YAG laser system for laser peening has been developed and tested. At ambient temperature which changes less than 2 ℃, after 20 min of warmup, the maximum pulse energy is 25 J, the energy instability is less than 3%, the pulse width is adjustable between 16 ns and 20 ns, the pulse width instability is less than ±1 ns, the beam divergence is less than 2.5 mrad, and the maximum frequency is 5 Hz. A TC4 titanium alloy workpiece is processed with the laser system, the compressive residual stress is greatly improved. The results show that the performance of the laser system is very excellent.