高能激光大气传输光束扩展的定标规律研究  

Scaling Law for Beam Spreading During High-Energy Laser Propagation in Atmosphere

作　　者：孙兴旺 张庆 钟哲强[1] 张彬[1] Sun Xingwang;Zhang Qing;Zhong Zheqiang;Zhang Bin(College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《光学学报》2022年第24期66-72,共7页Acta Optica Sinica

基　　金：国家重大专项应用基础项目(JG2020376);国家重点研发计划(2021YFC2202203);中国科学院自适应光学重点实验室基金(LAOF1801)。

摘　　要：为快速预测和评估高能激光大气传输时湍流和热晕对光束扩展的影响,开展了激光大气传输光束扩展的定标规律研究。通过计算模拟光束扩展随大气特征参量和激光参数的变化规律,建立了含湍流和热晕综合效应的激光大气传输光束扩展的定标关系。由此定标关系可知,当激光的初始光束质量较差时,由衍射和湍流引起的光束扩展随发射系统口径与大气相干长度之比的增大而更快地增强。随着发射系统菲涅耳数的增大,光束扩展受热晕的影响也随之增强。所建立的定标关系适用于不同强度的湍流和热晕效应情况下对不同功率的激光光束扩展规律的快速预测和评估,可为激光系统的设计及优化提供参考。To quickly predict and evaluate the effects of turbulence and thermal blooming on the beam spreading during high-energy laser(HEL)propagation in atmosphere,this study examined the scaling law for the beam spreading during laser propagation in atmosphere.By calculating the variation law of the simulated beam spreading with characteristic parameters of atmosphere and laser parameters,the paper built a scaling relationship for the beam spreading during laser propagation in atmosphere with both the turbulence effect and the thermal blooming effect.This scaling relationship reveals that when the initial beam quality of the laser is poor,the beam spreading caused by diffraction and turbulence grows with the ratio of the aperture of the transmitting system to the atmospheric coherence length at a faster rate.Also,the effect of thermal blooming on beam spreading intensifies as the Fresnel number of the transmitting system increases.The established scaling relationship performs well in rapidly predicting and evaluating the beam spreading laws of lasers with different powers under turbulence and thermal blooming effects of different intensities.Therefore,it can provide a reference for the design and optimization of laser systems.

关 键 词：大气光学 高能激光 定标关系 大气湍流效应 热晕效应 

分 类 号：TN012[电子电信—物理电子学]