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
王柯 1杨奕萱 1周雅诵 1郭广妍 2叶志斌 3董士远 1王惟泽 1邓可然 1蒋茂华 1易家玉4
作者信息
- 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
- 折叠
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.
Abstract
In this paper,a comprehensive multiphysics field model is developed to assess the thermal effects of direct-liquid-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Key words
thin-disk laser/direct-liquid-cooled/immersed laser/thermal effect/thermally induced wavefront aberration引用本文复制引用
基金项目
国家自然科学基金(62205041)
国家自然科学基金(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)
出版年
2024
NETL
NSTL
万方数据