Nd∶YAG板条激光增益模块真空焊接工艺研究  

Study on vacuum welding process of Nd ∶ YAG slab laser module

作　　者：陈露 吕坤鹏 梁兴波 刘磊 刘洋 唐晓军 CHEN Lu;LU Kun-peng;LIANG Xing-bo;LIU Lei;LIU Yang;TANG Xiao-jun(Key Laborootory of Solid State Laser Technology,Beijing 100015,China)

机构地区：[1]固体激光技术重点实验室,北京100015

出　　处：《激光与红外》2019年第1期55-58,共4页Laser & Infrared

摘　　要：传导冷却型Nd∶YAG板条激光放大器通常要把大尺寸晶体与微通道热沉焊接在一起,提高散热能力。为获得高光束质量的激光输出,要求焊面的空洞率越低越好,以降低Nd∶YAG板条激光增益模块在工作时产生的热畸变,本文提出了一种实现Nd∶YAG板条激光增益模块大面积无空洞焊接的工艺。在真空辐射加热条件下,使用精密行程控制系统调整热沉和Nd∶YAG板条激光增益介质之间焊接缝隙大小。通过对模拟件超声波扫描图的对比分析,使用精密行程控制系统调整焊接缝隙大小的焊接设计实现了大面积低空洞的连接,有效焊接面积达到98. 9%。利用该工艺封装的增益模块进行了激光实验,在11kW泵浦光注入情况下,模块动态波前畸变减小了22%,表明新的焊接工艺可以提高Nd∶YAG板条激光增益模块的输出激光功率和光束质量。Conducting cooling Nd:YAGslab laser amplifiers usually require large crystals to be welded together with micro channel heat sink to improve heat dissipation.In order to obtain the laser output with high beam quality,it is re quired that the void rate of the welding surface should be as low as possible,so as to reduce the thermal distortion generated by Nd:YAG slab laser module in operation.In this paper,a welding process of large size Nd:YAG slab laser module with low void welding is presented.In the vacuum radiation heating condition,the accurate travel control system is used to adjust the welding gap bet^veen slab and heat sink.Through the comparison and analysis of the ultrasonic scanning images of the simulated parts,the connection of large area and lower void welding was realized by using the welding design of adjusting the welding gap size with the accurate travel control system,and the effective welding area reached 98.9%.The laser experiment was carried out Under the condition of llkW pump light injection,the dynamic wavefront distortion of the Nd:YAG slab laser module was reduced by 22%,indicating that the new welding process could improve the output laser power and beam quality of slab laser module.

关 键 词：Nd∶YAG板条激光增益模块 铟焊接 空洞率 

分 类 号：TN242[电子电信—物理电子学]