高功率激光器光束质量测量的衰减缩束实验  

Experiment on attenuation and compression in beam quality measurement of high power laser

作　　者：单小琴 李天昊 朱日宏[3] SHAN Xiaoqin;LI Tianhao;ZHU Rihong(School of Electronic and Optical Engineering,Nanjing University of Science and Technology Zijin College,Nanjing 210023,China;Tianjin Jinhang Technical Physics Institute,Tianjin 300308,China;School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学紫金学院电子工程与光电技术学院,江苏南京210023 [2]天津津航技术物理研究所,天津300308 [3]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《应用光学》2023年第6期1250-1257,共8页Journal of Applied Optics

基　　金：国家自然科学基金(61875087)。

摘　　要：针对目前光束质量分析仪只能用于小口径、低功率激光器光束质量评估的问题,开展了高功率激光器光束质量测量的衰减缩束技术实验研究,搭建了缩束激光的波像差及光束质量测量装置,开展了缩束组件装调误差对光束质量影响的实验。实验结果表明,随着装调视场角度的增加,1/3倍缩束组件在1.2°视场处M^(2)测量偏差小于5%。搭建了偏振分光装置,研究了衰减组件对光束稳定性的影响。实验结果表明,随机偏振的准单模激光器的稳定性比多模激光更易受到衰减组件退偏的影响。搭建了高反式与楔板式高功率激光光束质量测量装置,对1 kW准单模激光进行光束质量测量。实验结果表明,在高反式测量装置中,待测光束通过高反镜时产生了退偏,从而导致光束质量测量结果偏小,楔板式测量装置的测量结果更能准确反映待测光的光束质量。In order to solve the problem that the current beam quality analyzer can only be used to evaluate the beam quality of small caliber and low power lasers,an experimental study on the attenuation and compression technique of high power laser beam quality measurement was carried out.A device for measuring wave aberration and beam quality of the compressed beam laser was built,and an experiment was carried out to determine the influence of the assembly error on beam quality.The experimental results show that,with the increase of the field of view,the measurement deviation of M^(2) of 1/3 compressed beam assembly at 1.2°field of view is less than 5%.A polarization splitting device was built,and the influence of attenuated components on beam stability was studied.The experimental results show that the stability of the quasi-single mode laser with random polarization is more susceptible to the depolarization of the attenuated components than that of the multi-mode laser.A high power laser beam quality measuring device with high reflection type and wedgeplate type was built to measure the beam quality of 1 kW quasi-single mode laser.The experimental results show that in the high reflection measuring device,the depolarization occurs when the beam passes through the high reflector,which leads to a smaller beam quality measurement result,and the results of the wedge-plate measuring device can more accurately reflect the beam quality.

关 键 词：高功率激光器 光束质量测量 衰减组件 缩束组件 

分 类 号：TN242[电子电信—物理电子学]