高热负荷激光介质热应力场的分析与优化研究

研究了高热负荷板状激光介质在抽运面采用常规冷却技术时,换热面积较小的上下侧面的换热强度对激光介质最高温度及最大应力的影响情况,并对热应力场进行了优化研究。结果表明,任意抽运功率下,介质的最高温度及最大应力均随侧面换热系数的变化而变化,并存在最优换热系数。与侧面采用常规冷却手段时相比,采用最优换热系数时介质的最大应力降幅高达36%。另外,对介质上下侧面进行温度控制,也可达到与控制换热系数相同的效果。

Analysis and optimization of thermal stress field in a high power laser slab

This paper deals with the high power laser slab. The i nfluence of the cooling intensities at its top/bottom sides on its highest tempe rature and maximum thermal stress has been numerically investigated for the case that its pumped sides are cooled with the conventional technique. The optimizat ion of thermal stress field has been performed. The calculation results show tha t for any pumped power the highest temperature and maximum thermal stress vary w ith the heat transfer coefficient of the top/bottom sides and the optimum heat t ransfer coefficient exists. As compared to the case that the top/bottom surfaces are cooled with the conventional technique,using the optimum heat transfer coe fficient maximum thermal stress can decrease 36% and the same effect can be achi eved if the top/bottom surface temperature is appropriately controlled.