直接液冷侧面泵浦Ti:Sapphire激光器的热效应分析  

Thermal Analysis of Direct-Liquid-Cooled Side-Pumped Ti∶Sapphire Thin-Disk Lasers

作　　者：王柯 杨奕萱 周雅诵 郭广妍 叶志斌 董士远 王惟泽 邓可然 蒋茂华[1] 易家玉[4] Wang Ke;Yang Yixuan;Zhou Yasong;Guo Guangyan;Ye Zhibin;Dong Shiyuan;Wang Weize;Deng Keran;Jiang Maohua;Yi Jiayu(College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;College of Electrical and Information Engineering,Quzhou University,Quzhou 324000,Zhejiang,China;Institute of Applied Electronics,China Academy of Engineering Physics,Mianyang 621900,Sichuan,China)

机构地区：[1]重庆师范大学物理与电子工程学院,重庆401331 [2]中国科学院空天信息创新研究院,北京100094 [3]衢州学院电气与信息工程学院,浙江衢州324000 [4]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《激光与光电子学进展》2024年第15期190-198,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62205041,62105179);固体激光技术重点实验室基金(6142404200105);重庆市科学技术局博士“直通车”项目(CSTB2022BSXM-JSX0006);重庆市教育委员会科学技术研究计划青年项目(KJQN202100546);浙江省自然科学基金联合基金(LZY21F050001)。

摘　　要：建立多物理场模型,对直接液冷侧面泵浦Ti:Sapphire薄片激光器的热效应进行了分析。对侧面非均匀泵浦下薄片的温度分析指出:泵浦光在薄片内的全反射传输并未引起温度的剧烈起伏;流体的热边界层厚度远远小于流体厚度的一半,则相邻两片薄片之间不存在热串扰。对热安全性的分析指出,随着热功率的增加,既定工况下激光器的热安全性受到了固液界面温度的限制,先于薄片的热应力达到瓶颈;断裂应力限制下Ti:Sapphire薄片的热负载功率为4.43 kW,是相同工况下Nd:YAG的4.92倍。对热致波前畸变的分析指出:由于热边界层很薄,虽然流体的热光系数是薄片的数十倍,但是流体所引入的波前畸变不一定占主导地位;流体热光效应致波前畸变与薄片介质热光效应、热变形的影响相互补偿,预示着通过优化设计可大幅提升光束质量。In this paper,a comprehensive multiphysics field model is developed to assess the thermal effects of directliquid-cooled side-pumped Ti∶Sapphire thin-disk lasers.The thermal analysis of the disks subjected to lateral nonideal pumping revealed that the total reflection transmission of pump light within the disks does not cause considerable temperature fluctuations.In addition,the thermal boundary layer thickness of the cooling fluid is considerably smaller than half of the fluid thickness,ensuring there is no thermal interference between adjacent disks.Furthermore,the thermal safety analysis revealed that,as the thermal power increases,the operational limits of the laser under the prescribed conditions are determined by the solid-liquid interface temperature,rather than the thermal stress on the lamellae.The Ti∶Sapphire lamellae can handle a thermal loading power of up to 4.43 kW,which is 4.92 times greater than that of Nd∶YAG under identical operational parameters.Finally,the analysis of thermal wavefront distortion revealed that,despite the cooling fluid possessing a thermal-optical coefficient tens of times higher than that of the lamellae,the thin thermal boundary layer prevents it from being the dominant factor.The wavefront distortion introduced by the thermal-optical effect of the fluid is balanced by the thermal-optical effect of the lamellae medium and thermal distortion.This suggests that optimizing the design can considerably enhance beam quality.

关 键 词：薄片激光器 直接液冷 浸入式激光器 热效应 热致波前畸变 

分 类 号：TN248.1[电子电信—物理电子学]