基于波前传感器标定优化的自适应光学校正方法  

Adaptive Optics Correction Method Based on Calibration Optimisation of Wavefront Sensor

作　　者：苏春轩 董理治 樊新龙[1,2] 赖柏衡 马士青 杨平[1,2,3] 许冰 Su Chunxuan;Dong Lizhi;Fan Xinlong;Lai Boheng;Ma Shiqing;Yang Ping;Xu Bing(Key Laboratory on Adaptive Optics,Chinese Academy of Sciences,Chengdu,Sichuan 610209,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu,Sichuan 610209,China;University of Chinese Academy of Sciences,Beijing 100049,China;Academy of Microelectronics Systems,CASIC Corporation,Chengdu,Sichuan 610213,China)

机构地区：[1]中国科学院自适应光学重点实验室,四川成都610209 [2]中国科学院光电技术研究所,四川成都610209 [3]中国科学院大学,北京100049 [4]航天科工微电子系统研究院有限公司,四川成都610213

出　　处：《中国激光》2021年第23期71-80,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(11704382)。

摘　　要：在自适应板条固体激光器光束净化研究中,基于最小二乘法的传统自适应光学系统以斜率残差平方和最小为校正目标。当激光器光束的波前畸变无法被变形镜完全补偿且补偿后仍然有大量的波前残差时,斜率残差平方和最小不能等效于光束质量最优值,因此该方法只能获得系统的次优解。针对此问题,提出一种新颖的自适应光学校正方法。该方法以提高光束质量为目标,根据波前畸变以及变形镜的校正能力,使用优化算法对波前传感器的标定位置进行优化,再使用传统自适应光学系统进行像差补偿。仿真结果表明,相较于未进行标定优化的传统自适应光学系统,使用该方法可以在变形镜校正能力有限的情况下有效提升自适应光学系统的校正效果。Objective The solid-state slab laser has become one of the most reliable,promising and potential lasers among current high-power lasers due to its small size,lightweight and high conversion efficiency.It is commonly used in various fields,including scientific research,industry and medical treatment.High output power and good beam quality are two constant goals in the development of high-power solid-state slab lasers.As laser output power increased,the edge effects became more severe and distorted the wavefront of the solid-state slab laser output beam,resulting in a non-linear drop in laser beam quality.Several methods are present to compensate for the distortions,including the use of static compensation components,non-linear optical compensation methods,and adaptive optics.Adaptive optics is a promising method to compensate for wavefront distortion in the laser output beam.The direct slope reconstruction method is commonly used in the research of solid-state slab laser beam clean-up,and the leastsquares algorithm is used to solve the system’s optimal solution.Although adaptive optics can considerably improve the beam quality of laser output beams,some issues still need to be addressed.The least-squares reconstruction method’s criteria are to minimise the sum of slope residual squares.The adaptive optics system’s correction capability is limited by factors such as materials and cost.When the adaptive optics system can completely compensate for wavefront distortion,the least-squares reconstruction method can be used to obtain the system’s optimal solution.However,if a portion of the distortions is beyond the capability of adaptive optics system,the wavefront distortions of the laser beam cannot be fully compensated and a considerable amount of wavefront residual is still present after compensation;the minimum sum of slope residuals squares is not equivalent to the best beam quality at this time.When the solid-state slab laser operates at high gain,the wavefront distortions are very likely to exceed the ada

关 键 词：自适应光学 像差补偿 板条固体激光器 标定优化 

分 类 号：O436[机械工程—光学工程]