评估固体激光器对流换热系数的方法
Method to estimate surface heat transfer coefficient of solid-state laser
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摘要: 为提高固体激光器的热管理效果，提出了一种使用316L不锈钢片代替激光晶体评估固体激光器表面对流换热系数的方法。在低冷却水温的条件下，使用快响应热电偶对替代片和出口水流的动态温度进行测量，应用有限元方法计算不同对流换热系数下替代片的动态温度,讨论了对流换热系数对重频大能量激光器热效应的影响。通过寻找测量值和计算值的最小方差，得到该冷却结构下的激光器表面对流换热系数为3 500 W·m-2·K-1。Abstract: This article proposes a simple method using a false crystal (316L steel) to estimate the surface heat transfer coefficient of solid-state laser. First we set a low cooling water temperature, measure the temperature evolution of outlet water and the false crystal with two thermal couples, and then we calculate temporal evolution of temperature with arbitrary heat transfer coefficient using finite element analysis. By searching the lowest least square difference between measurement and simulation, heat transfer coefficient is estimated finally. The impact of heat transfer coefficient in rep-rated and high-energy laser design is also presented.
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