谐振腔状态对高功率Nd:YAG脉冲固体激光器光束指向稳定性的影响  

Influence of resonant cavity state on beam pointing stability of high-power Nd:YAG pulsed solid-state laser

作　　者：傅超[1] 王石语[1] 李兵斌[1] 李乐群 FU Chao;WANG Shiyu;LI Bingbin;LI Lequn(School of Optoelectronic Engineering,Xidian University,Xi'an 710071,China)

机构地区：[1]西安电子科技大学光电工程学院,陕西西安710071

出　　处：《应用光学》2024年第6期1298-1306,共9页Journal of Applied Optics

摘　　要：针对评估高功率固体激光器光束指向角不稳定性的需求,构建了考虑热分布和增益分布的激光光场数值计算模型,分析了谐振腔输出镜和反射镜失谐程度对光束指向稳定性的影响。定义了腔镜转动微扰因子和腔镜移动微扰因子,分别描述腔镜平行失谐和共轴失谐的程度,并在谐振腔光场计算中引入了微扰因子、热效应调制和增益调制。利用该方法研究了高功率Nd:YAG固体激光器在腔镜失谐状态下,谐振腔参数对光束指向稳定性的影响。抽运功率为10000 W,腔镜转动微扰因子和腔镜移动微扰因子分别在1×10^(−4)~50×10^(−4)和1×10^(-7)~50×10^(-7)范围内变化时,激光束指向偏移角均方根值在抽运脉冲时间内的波动范围为1×10^(-6)rad~5×10^(-3)rad。A numerical calculation model of laser light field considering thermal distribution and gain distribution was constructed to evaluate the beam pointing angle instability of high-power solid-state lasers.The influence of the detuning degree of the resonant cavity output mirror and the mirror on the beam pointing stability was analyzed.The cavity mirror rotation perturbation factor and the cavity mirror movement perturbation factor were defined to describe the degree of parallel detuning and coaxial detuning of the cavity mirror,respectively,and the perturbation factor,thermal effect modulation and gain modulation were introduced in the calculation of the resonant cavity light field.The influence of resonant cavity parameters on the beam pointing stability of high-power Nd:YAG solid-state laser under the condition of cavity mirror detuning was studied.When the pump power is 10000 W,and the cavity mirror rotation perturbation factor and the cavity mirror movement perturbation factor changing in the range of 1×10^(-4)~50×10^(-4) and 1×10^(-7)~50×10^(-7),respectively,the fluctuation range of the root mean square value of laser beam pointing offset angle in the pump pulse time is 1×10^(-6) rad~5×10^(-3) rad.

关 键 词：高功率固体激光器 光束指向稳定性 谐振腔失谐 LD端面泵浦 

分 类 号：TN248[电子电信—物理电子学]