论文部分内容阅读
二极管端面抽运固体激光器中,圆棒晶体采用金属热沉夹持并散热,晶体侧面受到的压力呈非轴对称分布.建立了此状态下晶体棒与热沉间无热界面物质、采用厚度为平均间隙厚度和远大于平均间隙厚度的热界面物质三种情况下接触热导模型.针对前两种模型,采用截断高斯模型和塑性形变模型,讨论了接触热导与装配压力、等效均方根粗糙度的关系.建立了晶体棒与热沉的接触散热模型,对高斯型热耗分布,采用有限元法得到了无热界面物质和采用铟箔作为热界面物质时晶体棒温度的空间分布.结果表明:无热界面物质时,晶体棒与热沉间接触热导随圆心角变化较大,其值在热沉凹槽底部最大,在两块热沉接触面处最小;装配压力增大或均方根粗糙度减小时,接触热导变大,其均匀性变差,晶体棒温度降低.使用铟箔作为热界面物质时,接触热导及其均匀性得到很大提高,晶体棒温度整体降低,其分布关于光轴对称.
In the diode end-pumped solid-state laser, the rod-shaped crystal is clamped by the metal heat sink and dissipates heat, the pressure on the side of the crystal is non-axisymmetrically distributed, and the non-thermal interface material between the crystal rod and the heat sink is established in this state, Average gap thickness and much larger than the average gap thickness of the thermal interface material contact thermal conductivity of three cases.For the first two models, the use of truncated Gaussian model and plastic deformation model, the contact heat conduction and assembly pressure, equivalent mean square Root roughness relationship between the crystal rod and the heat sink contact cooling model was established for Gaussian heat distribution, the finite element method was used to obtain the thermal interface material and the indium foil as a thermal interface material when the crystal rod temperature distribution The results show that the contact angle between the crystal rod and the heat sink changes greatly when the material is absent, its value is the largest at the bottom of the heat sink and the minimum at the contact surface of the two heat sinks. The assembly pressure increases Or the root-mean-square roughness decreases, the contact heat conductance becomes larger and its uniformity deteriorates and the temperature of the crystal rod decreases. When the indium foil is used as the thermal interface material, the contact heat conductance and its uniformity are greatly improved, and the crystal An overall reduction in the temperature of the rod, which is distributed symmetrically about the optical axis.