基于变形镜的碟片激光器基模谐振腔动态补偿  

Dynamic Compensation of Fundamental Mode of Thin Disk Laser Resonators Based on a Deformable Mirror

作　　者：李征远 邹浩 朱广志[1,2] 董静 王海林[1,2] 朱晓 Li Zhengyuan;Zou Hao;Zhu Guangzhi;Dong Jing;Wang Hailin;Zhu Xiao(School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China;National Engineering Research Center for Laser Processing,Wuhan,Hubei 430074,China)

机构地区：[1]华中科技大学光学与电子信息学院,湖北武汉430074 [2]激光加工国家工程研究中心,湖北武汉430074

出　　处：《光学学报》2022年第8期154-160,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61975060)。

摘　　要：碟片激光器因具有高峰值功率与大能量等特性备受青睐,但在输出高功率激光的同时碟片晶体也极易受到热效应的影响而发生形变,致使光束质量劣化。设计并制作了一种简单的变形镜来补偿碟片晶体的光焦度变化。通过调节气室的气压,变形镜的曲率半径可以实现在2.050 m至+∞之间调整。基于此变形镜,碟片激光器的工作点能够随着光焦度的改变而同步移动。碟片上的激光光斑半径在整个泵浦范围内保持不变。因此碟片激光器可以保持工作在基模而激光光束质量因子M^(2)从阈值至最大激光输出均不超过1.2。Thin disk lasers are becoming increasingly popular owing to their high peak power and pulse energy.Although high-power beams can be output by such lasers,the disk crystal is liable to deformation due to thermal effects,and the result is degraded beam quality.In this paper,a simple deformable mirror is designed and fabricated to compensate for the changes in the focal power of the thin disk crystal.The curvature radius of the deformable mirror can be changed between 2.050 m and+∞by adjusting the pneumatic pressure in the air chamber.With the deformable mirror,the operating point of the thin disk laser can shift synchronously with the change in the focal power.The radius of the laser spot on the thin disk remains the same in the whole pump range.Consequently,the thin disk laser can operate in the fundamental mode,with the beam quality factor M^(2) remaining no more than 1.2 under both the threshold and the maximum laser output conditions.

关 键 词：激光器 变形镜 碟片激光器 光焦度 基模 补偿 

分 类 号：TN248.1[电子电信—物理电子学]