摘要
直接液冷端面均匀泵浦薄片激光器具有高光束质量输出潜质,针对制约其高光束质量输出的热致波前畸变难题,基于流体力学层流模型开展了热效应分析。通过对比理想的满口径泵浦和实际的非满口径泵浦两种热加载条件下的温度分布和波前畸变,指出冷却液沿流动方向的热量累积使激光器产生了沿流动方向的波前畸变,沿薄片横向在泵浦边缘位置处温度的陡然下降造成了激光波前的严重恶化,实验结果也验证了这一结论。另外,热安全性评估指出,单薄片最大热负载受到薄片应力的限制,先于固液界面温升达到瓶颈;热致波前畸变分析指出,Nd:YLF薄片热变形致波前畸变可忽略不计、流体热光效应是波前畸变主要来源。
Direct liquid-cooled end-pumped thin-disk lasers,which offer high output potential for beam quality,were analyzed focusing on addressing thermally induced wavefront distortion issues.A hydrodynamic laminar flow model was utilized for this purpose.Comparing the temperature distributions and wavefront distortions under two thermal loading conditions ideal full aperture pumping and less-than-ideal nonfull aperture pumping-revealed that heat accumulation within the coolant along the flow direction causes wavefront distortion along the same direction.In additional,a sharp decrease in temperature at the pumping edge position along the transverse direction of the thin-disk leads to considerable deterioration in the laser wavefront.Experimental results corroborate these findings.Furthermore,our thermal safety assessment highlights that the maximum thermal load of a single thin-disk is constrained by thin-disk stress,which becomes the bottleneck before the temperature rise at the solid-liquid interface.The analysis of thermally induced wavefront distortion revealed that the thermal deformation of the Nd∶YLF thin-disk has a minimal effect on wavefront distortion and the primary source of wavefront distortion is the fluid thermo-optic effect.
作者
杨奕萱
周雅诵
郭广妍
董士远
王惟泽
邓可然
蒋茂华
王柯
Yang Yixuan;Zhou Yasong;Guo Guangyan;Dong Shiyuan;Wang Weize;Deng Keran;Jiang Maohua;Wang Ke(College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2024年第15期230-238,共9页
Laser & Optoelectronics Progress
基金
国家自然科学基金(62205041)
重庆市科学技术局博士“直通车”项目(CSTB2022BSXM-JSX0006)
固体激光技术重点实验室基金(6142404200105)
重庆师范大学博士启动基金(202104000231/02060404)。
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
thin-disk laser
direct-liquid-cooled
immersed laser
thermal effect
thermally induced wavefront aberration
