宽温区Yb∶YAG板条激光模块热畸变仿真研究  

Simulation study of thermal aberration of Yb∶YAG slab laser module in wide temperature region

作　　者：朱铎 宋艳洁 陈中正[1,2,4] 许元斋[1,3] 薄勇 彭钦军 ZHU Duo;SONG Yan-jie;CHEN Zhong-zheng;XU Yuan-zhai;BO Yong;PENG Qin-jun(Key Lab of Solid State Laser,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;Key Lab of Functional Crystal and Laser Technology,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China;Institute of Optical Physics and Engineering Technology,Qilu Zhongke,Jinan 250000,China)

机构地区：[1]中国科学院物理与化学技术研究所固体激光重点实验室,北京100190 [2]中国科学院理化技术研究所功能晶体与激光技术重点实验室,北京100190 [3]中国科学院大学,北京100190 [4]齐鲁中科光学物理与工程技术研究所,山东济南250000

出　　处：《激光与红外》2024年第4期503-507,共5页Laser & Infrared

基　　金：国家自然科学基金项目(No.62205349);2021年“泉城学者”建设工程项目资助。

摘　　要：本文对不同冷却温度下的Yb:YAG晶体板条激光模块高功率运转时的温度场、应力场及对应的热畸变进行了仿真分析研究。结果显示,随着冷却温度从300 K降低至77K,板条的温度梯度热应力与应变都明显降低。当冷却温度为77 K时,最大主应力为4.14 MPa,仅为常温时的15.6%,最大主应变为3.82×10^(-5),仅为常温时的6%。为了分析Yb:YAG晶体板条激光模块不同冷却温度下输出激光的光束质量,以确定其最佳运转温度,我们采用光线追迹的方法,对单程通过板条的1030 nm探测光进行仿真。可以看到,当冷却温度为77 K时,远场光斑能量更为集中,且探测光光程差的PV值为0.7941μm,仅为300 K时的59.6%。模拟结果表明低温运转有利于Yb:YAG晶体板条激光模块产生高功率高光束质量激光输出,这为高功率高光束质量Yb:YAG晶体板条激光的设计工作奠定了基础。In this paper,the temperature field,stress field and corresponding thermal distortion of Yb∶YAG crystal slab laser module during high power operation at different cooling temperatures are simulated and analyzed.The results show that the temperature gradient thermal stresses and strains of the slats decrease significantly as the cooling temperature is reduced from 300K to 77 K.The maximum principal stress is 4.14 MPa,which is only 15.6% of that at room temperature.When the cooling temperature is 77 K,the maximum principal stress is 4.14 MPa,which is only 15.6% of that at room temperature,and the maximum principal strain is 3.82×10^(-5),which is only 6% of that at room temperature.In order to analyze the beam quality of the output laser at different cooling temperatures of the Yb∶YAG crystal slab laser module to determine its optimal operating temperature,the 1030 nm probe light passing through the slat in one pass is simulated by the method of light tracing.It can be seen that when the cooling temperature is 77 K,the far field spot energy is more concentrated,and the PV value of the detection light path difference is 0.7941μm,which is only 59.6% of that at 300K.The simulation results show that the low temperature operation is favourable to the generation of high power and high beam quality laser output from the Yb∶YAG crystal slat laser module,which lays a foundation for the design of high power and high beam quality Yb∶YAG crystal slat lasers.

关 键 词：板条激光器 Yb∶YAG 热效应 仿真模拟 

分 类 号：TN248[电子电信—物理电子学] O436[机械工程—光学工程]