百瓦级环形非稳腔板条激光器腔内校正  

Intra-Cavity Aberration Compensation in 100 W-Order Unstable Ring Slab Lasers

作　　者：王勋 赖柏衡 董理治[1,2] 杨平[1,2] 陈善球[1,2] 王帅[1,2] 许冰[1,2] Wang Xun;Lai Boheng;Dong Lizhi;Yang Ping;Chen Shanqiu;Wang Shuai;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)

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

出　　处：《中国激光》2019年第8期1-7,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(61875203,61805251,1171101412,11704382,11811530290)

摘　　要：提出一种环形非稳腔结构,该结构将传统驻波非稳腔腔内的非共轭像差校正转换为共轭像差校正。搭建了百瓦级环形非稳腔Nd:YAG板条激光器,采用59单元自适应光学系统对腔内像差进行校正。利用980 nm参考光束和Shack-Hartmann波前传感器测量腔内像差,采用加权最小二乘法复原波前像差,最后用倾斜镜和变形镜进行校正。最终在低抽运功率下将输出功率从105.8 W提高到113.1 W,光束质量β因子从6.98优化到2.33。该研究为环形非稳腔应用于高功率固体激光器并获取高输出光束质量提供了一种技术途径。We propose an unstable ring resonator to transform the nonconjugation correction of intra-cavity aberrations in the traditional standing-wave unstable resonator into conjugation compensation. A 100 W-order Nd:YAG slab laser with the unstable ring resonator is constructed, with a 59-element adaptive optics system compensating the intra-cavity aberrations. A 980 nm reference beam and a Shack-Hartmann wave-front sensor are employed to measure the intra-cavity aberrations. Then the weighted least square method is applied to reconstruct the aberrations. The tip/tilt mirror and deformable mirror are used to correct the aberrations. With the aberrations compensated by an adaptive optics system, the output power increases from 105.8 W to 113.1 W and the beam quality factor improves from 6.98 to 2.33 under a relatively low pump power. The study provides a technical approach for high power solid-state unstable ring lasers to achieve high beam quality.

关 键 词：激光光学 环形非稳腔 ND:YAG 板条激光器 自适应光学 

分 类 号：O436[机械工程—光学工程]