激光冲击强化激光器的研制  

Development of laser system for laser peening

作　　者：乔红超[1] 赵吉宾[1] 郭庆耀[1] 

机构地区：[1]中国科学院沈阳自动化研究所,沈阳110016

出　　处：《强激光与粒子束》2013年第9期2179-2180,共2页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目

摘　　要：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20min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25J,能量不稳定度小于3%,脉宽16～20ns可调,脉宽不稳定度小于±1ns,光束发散角小于等于2.5mrad,重复频率达5Hz。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.

关 键 词：激光冲击强化 激光器 短脉宽 大能量 残余压应力 

分 类 号：TN248.1[电子电信—物理电子学]