基于变形镜本征模式和远场测量的光束净化  

Laser beam cleanup based on deformable-mirror eigen modes and far-field measurement

作　　者：梁佳新 向汝建[1] 杜应磊[1] 顾静良[1] 吴晶[1] Liang Jiaxin;Xiang Rujian;Du Yinglei;Gu Jingliang;Wu Jing(Institute of Applied Electronics,China Academy of Engineering Physics,Mianyang 621900,China;Graduate School of China Academy of Engineering Physics,Beijing 100088,China)

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900 [2]中国工程物理研究院研究生院,北京100088

出　　处：《强激光与粒子束》2020年第8期6-13,共8页High Power Laser and Particle Beams

基　　金：中物院创新发展基金项目(CX2020033);国防科技创新特区课题项目(18H86302ZT00102103)。

摘　　要：利用波前传感器对光束进行净化的自适应光学系统是目前提高光束质量的常用技术,但在实际应用中,该技术需要波前传感器,系统复杂,体积庞大,同时需要较高性能信标源。为解决上述问题,提出了一种基于变形镜本征模式和远场光斑特征分析的无波前自适应光学系统,用于校正激光器输出的方形光束。将变形镜影响函数进行本征模式分解,并用远场光斑的均方半径作为评价函数,建立了畸变波前的模式系数与评价函数之间的关系,通过测量评价函数获得模式系数用于求解校正电压,实现波前共轭校正。仿真校正和实验验证结果表明,该方法可以有效实现静态像差校正,提高远场光斑的能量集中度。Wavefront sensor-based beam cleanup adaptive optical system is the main equiment to improve the beam quality of high-energy laser systems. However, the system is complicated and bulky because it requires to measure wavefront and needs a strong beacon source. To solve the above problems, this paper proposes a wavefront sensorless adaptive optical system which utilizes the deformable-mirror eigen modes and the characteristics of the farfield spot for processing and analyzing thus to correct the square beam. The eigenmode decomposition of the deformable mirror ’s influnce function is used, and the mean square radius of the far-field spot is used as the metric function. The relationship between the eigenmode coefficient of the wavefront and the metric function is established. The measurement of the metric function is used to calculate voltage. Simulation analysis and experimental verification of the correction method show that the method can effectively achieve the correction of static aberrations and improve the energy concentration of the far-field spot.

关 键 词：变形镜本征模式 远场光斑 无波前传感器 静态像差 光束净化 自适应光学 

分 类 号：O439[机械工程—光学工程]