热沉几何参数对侧面泵浦板状激光介质热效应影响分析

以不均匀换热系数模型为基础，数值研究了侧面泵浦板状激光介质在热沉冷却情况下，热沉的几何参数对介质最高温度及最大应力的影响。结果表明，热沉材料对激光介质热效应的影响表现在热阻效应和温度均匀化效应两个方面：热沉材料的导热性能较差时，介质最高温度及最大应力随介质厚度的增加而增加；热沉材料的导热性能较好时，不同热沉厚度下介质最高温度及最大应力变化很小。随着热沉长度的增加，介质内最高温度和最大应力均下降。

Analyses of effects of geometric dimensions of heat sink on thermal effect of side-pumped laser slab

Based on the non-uniform heat transfer coefficient model, numerical simulations were conducted to investigate the heat sink size effects on the highest temperature and the maximum thermal stress of a side-pumped laser slab. The results show that the heat sink has two effects on the thermal effect of the slab; they are the thermal resistance effect and the temperature uniformity effect, respectively. For heat sink with a low thermal conductivity, the highest temperature and the maximum thermal stress increase with increasing thickness of the heat sink. For heat sink with a higher thermal conductivity, however, the highest temperature and the maximum thermal stress are almost independent of the thickness of the heat sink. Furthermore, tile highest temperature and the maximum thermal stress decrease with increasing length of the heat sink.