Abstract The thermal effects model of slab crystal was established based on the practical operating conditions of the solid-state laser. To our knowledge, this is the first time to use the simulation software of COMSOL Multiphysics to investigate the thermal model of slab crystal with the complex boundary conditions in detail. And this is also the first time to use this theoretical method to a slab Tm:YLF laser. The results showed that thermal effects of Tm:YLF crystal were enhanced with the increase of the pump power. And the thermal effects increased sharply with the decrease of the size of the pump light along the Y-axis or the increase of the crystal doping concentration. Thermal deformation which produced by thermal lens effect played a leading role of Tm:YLF crystal. Finally, under the premise of elevated the laser output efficiency and ameliorated thermal effects, the optimized parameters were chosen which were the pump size of ω1×ω2=1mm × 6mm and doping concentration of 2.5at.%.

中文翻译：

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基于 COMSOL Multiphysics 的双端泵浦大功率板坯 Tm:YLF 激光器热效应分析

摘要 基于固态激光器的实际工作条件，建立了板状晶体的热效应模型。据我们所知，这是第一次使用 COMSOL Multiphysics 仿真软件详细研究复杂边界条件下的板坯热模型。而这也是第一次将这种理论方法应用到平板Tm:YLF激光器上。结果表明，随着泵浦功率的增加，Tm:YLF晶体的热效应增强。并且随着泵浦光沿Y轴尺寸的减小或晶体掺杂浓度的增加，热效应急剧增加。Tm:YLF晶体由热透镜效应产生的热变形起主导作用。最后，