高能激光热晕效应数值模拟方法的适用范围分析  

Analysis of Applicable Scope of Numerical Simulation Method forThermal Blooming of High-Energy Laser

作　　者：张琪 胡启立 王红燕 胡鸣 徐星宇 吴晶晶 胡立发[1,2] Zhang Qi;Hu Qili;Wang Hongyan;Hu Ming;Xu Xingyu;Wu Jingjing;Hu Lifa(School of Science,Jiangnan University,Wuxi 214122,Jiangsu,China;Jiangsu Provincial Research Center of Light Industry Opto-Electronic Engineering and Technology,Wuxi 214122,Jiangsu,China;Key Laboratory of Electro-Optical Countermeasures Test&Evaluation Technology,Luoyang 471003,Henan,China)

机构地区：[1]江南大学理学院,江苏无锡214122 [2]江苏省轻工光电工程技术研究中心,江苏无锡214122 [3]光电对抗测试评估技术重点实验室,河南洛阳471003

出　　处：《中国激光》2024年第8期137-145,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(61475152,62205127);光电对抗测试与评估技术重点实验室基金(GKCP2021001)。

摘　　要：热晕效应是影响高功率激光光束质量的重要因素之一,对这一效应进行合理的仿真,有利于高能激光的应用。针对目前模拟高能激光热晕效应的微扰法、积分法和相位屏法适用条件不清晰的问题,对三种数值模拟方法进行了系统的对比,并结合实验数据确定了每种方法最为合适的适用范围:广义畸变参数N<3时,选用积分法;3<N<4.8时,选用微扰法;N>4.8时,选用相位屏法。此外,利用可编程的液晶空间光调制器实现了热晕相位畸变的实验室模拟,得到的实验室模拟结果与数值仿真结果高度吻合。合理的数值模拟及实验室模拟对于强激光的实际应用具有重要的参考价值。Objective Thermal blooming severely reduces beam quality and limits the efficiency of high-energy laser transmission in the atmosphere.Therefore,it is important to study the thermal blooming of high-energy laser propagation in the atmosphere systematically.Numerical simulation of thermal blooming is beneficial for the application of high-energy lasers.Numerical simulation methods for thermal blooming include perturbation,integral,and phase screen methods.However,most existing studies used only one of them for simulation,which led to obvious errors under some conditions.In this study,we compared the results of three methods and selected an appropriate numerical simulation range for each method based on the reported experimental results.In addition,field experiments for measuring the transmission of high-energy lasers in the atmosphere are complicated,and the experimental conditions are uncontrollable.Therefore,using a liquid crystal spatial light modulator(LC-SLM)based on the transmission characteristics of high-power lasers in the atmosphere is a valuable and cost-saving method for laboratory simulations of thermal blooming.We extracted the thermal blooming distortion phase based on the principle of the numerical simulation method and then used an LC-SLM to simulate thermal blooming in the laboratory.The experimental simulation results are consistent with the numerical simulation results.Methods In this study,numerical simulations of thermal blooming were performed using the perturbation,integral,and phase screen methods.First,the results of different numerical simulation methods for different transmission distances were compared.The results obtained using the different numerical simulation methods were significantly different,even under identical conditions.The relative peak intensity IREL(ratio of maximum received light intensity to maximum initial light intensity)was measured as a function of the generalized distortion parameter N in the reported reference.A reasonably fitted curve was then selected as the ref

关 键 词：激光光学 热晕效应 高能激光 微扰法 积分法 相位屏法 

分 类 号：O436.2[机械工程—光学工程] O439[理学—光学]