Analysis and optimization of thermal stress field in a high power laser slab
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摘要: 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。Abstract: This paper deals with the high power laser slab. The influence of the cooling intensities at its top/bottom sides on its highest temperature and maximum thermal stress has been numerically investigated for the case that its pumped sides are cooled with the conventional technique. The optimization of thermal stress field has been performed. The calculation results show that for any pumped power the highest temperature and maximum thermal stress vary with the heat transfer coefficient of the top/bottom sides and the optimum heat transfer coefficient exists. As compared to the case that the top/bottom surfaces are cooled with the conventional technique,using the optimum heat transfer coefficient maximum thermal stress can decrease 36% and the same effect can be achieved if the top/bottom surface temperature is appropriately controlled.
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