自由曲面镜补偿大功率激光波前畸变技术研究  

Research on compensation technology for high power laser wavefront aberration with freeform surface mirror

作　　者：王钢[1] 唐晓军[1] 王文涛[1] 王超[1] 刘磊[1] 赵鸿[1] 吕坤鹏 李佳蔚 WANG Gang;TANG Xiao-jun;WANG Wen-tao;WANG Chao;LIU Lei;ZHAO Hong;LV Kun-peng;LI Jia-wei(The 11th Research Institute of CETC,Beijing 100015,China;Northwestern Polytechnical University,Xi′an 710000,China)

机构地区：[1]中国电子科技集团公司第十一研究所,北京100015 [2]西北工业大学,陕西西安710000

出　　处：《激光与红外》2024年第9期1352-1357,共6页Laser & Infrared

摘　　要：对于一台性能稳定的激光器,在出光阶段整个系统处于热交换的稳定状态,即激光波前分布可以保持稳定不变。基于此特点,提出制造自由曲面镜,以校正激光器的波前畸变,提高光束质量。本文首先介绍了自由曲面镜的波前补偿原理、设计及加工过程,然后通过数学建模,从理论上对其波前补偿能力进行了仿真计算,最后在板条固体激光器中进行了波前补偿实验:在激光器输出功率为12.5 kW时,自由曲面镜对激光光束相位及远场光束质量都有明显的改善和提高。自由曲面镜不像变形镜那样受到致动器间距的限制,因此对于高阶像差的校正也更为有效,且成本低廉,再者也不会增加系统的复杂度,与自适应光学系统相比各有所长。For a laser with stable performance,the entire system is in a stable state of heat exchange during the working status,that is,the laser wavefront aberration can remain stable and unchanged.Based on this feature,the fabrication of free-form mirrors is proposed to correct the wavefront aberration of the laser and improve the beam quality.Firstly,the wavefront compensation principle,design and manufacturing process of the free-form surface mirror are introduced,then its wavefront compensation ability is theoretically simulated through mathematical modeling,and finally the wavefront compensation experiment is carried out in the slab solid laser.The result is that the free-form surface mirror improves the laser beam phase and far-field beam quality at an output power of 12.5 kW.Unlike anamorphic mirrors,free-form mirrors are not constrained by actuator spacing,and are therefore more effective at correcting higher-order aberrations,are less expensive,and do not add to the complexity of the system,each of which has its own advantages over an adaptive optics system.

关 键 词：自由曲面镜 波前校正 万瓦板条 固体激光器 光束质量 

分 类 号：O436[机械工程—光学工程] TN248.1[理学—光学]