薄片激光器低畸变冷却技术研究  

Cooling Techniques for Deformation Reduction of Thin-Disk Lasers

作　　者：蒋琳[1] 刘军[1] 袁晓蓉[1] 张浩[1] 李春领[1] 蔡光明[1] Jiang Lin;Liu Jun;Yuan Xiaorong;Zhang Hao;Li Chunling;Cai Guangming(Institute of Applied Electronics,China Academy of Engineering Physics,Mianyang,Sichuan 621900,China)

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《中国激光》2021年第3期1-7,共7页Chinese Journal of Lasers

基　　金：中国工程物理研究院高能激光科学与技术重点实验室基金。

摘　　要：薄片激光器的导热距离短,能显著降低热透镜效应,已经成为高功率固体激光研究的热点。然而,随着泵浦口径和泵浦功率的不断增大,热效应愈发严重,其造成的热致畸变成为限制激光器出光功率和光束质量的主要因素之一。针对大尺寸薄片激光器工作时热致畸变过大的情况,提出了基于非均匀冷却的微通道复合射流冲击的流道设计思路。基于该思路完成了中心辐射结构冷却器的设计,并借助流-固-热耦合仿真,研究了不同冷却器的流道结构参数对增益介质热致畸变的影响。实验结果表明,采用中心辐射结构的冷却器能将相同条件下的增益介质的光学畸变缩小50%。Objective Thin-disk lasers have become one of the main research targets in the high-power solid laser technology,owing to their short thermal conduction distance,which in turn causes a significant reduction in the thermal lensing effect.However,with the increase of pump caliber and pump power,the distorted wavefront caused by the increasingly serious thermal effect becomes one of the important factors restricting the output power and beam quality of laser.In this study,a new central radiative cooling structure is proposed.This structure satisfies the cooling requirements of thin-disk gain media and effectively reduces the thermal teratogenesis of gain media under a high-power loading.We hope that our basic strategy and findings can provide new approaches and ideas to achieve highly efficient cooling and distorted wavefront control of high-power thin-disk gain media.Methods The thermal teratogenicity of a large thin-disk gain medium is considerably large.To overcome this drawback,the technical route of microchannel composite jet impingement based on nonuniform cooling was proposed.Based on the technical route,the design of the central radiative structure cooler was created.In the central region of the heat transfer,jet impingement reduced the thickness of the boundary layer to enhance heat transfer and reduce the central temperature and thermal teratogenicity of the gain medium through "peak-clipping".The peripheral heat transfer runner was designed as a microchannel with a central radiative structure to guarantee the circumferential uniform distribution of flow field and realize the circumferential uniform cooling.Moreover,the effect of the different structure parameters on heat transfer performance and stress distortion in the gain medium was analyzed via the fluid-solid thermal coupling simulation.The performance comparison between the central radiative structure cooler and the microchannel cooler was completed through simulation and experiment.Results and Discussions The performances of the central radiative s

关 键 词：激光器 薄片激光器 微通道 射流冲击 波前畸变 

分 类 号：TN248.1[电子电信—物理电子学]