DPL中晶体散热效果的比较

采用有限元法，以光纤耦合LD端面泵浦Nd:YAG激光器为例，模拟了三种冷却方式下，激光晶体的温度分布；分析了不同冷却方式对晶体温度分布和端面形变的影响；计算了不同对流换热系数和冷却水温度对晶体温度的影响。结果表明：在晶体侧面水冷时，改变对流换热系数和液体温度只能改变晶体的整体温度，对温度分布的均匀性几乎没有影响；三种冷却方式中，泵浦端水冷情况下晶体温度最低，端面形变量最小。

Comparison of different cooling methods in DPL

The temperature distribution in the crystal of fiber coupling LD end-pumped Nd:YAG laser with different cooling methods has been studied by using finite element method. The influences of different methods on the temperature distribution in laser crystal are analyzed.The influences of heat transfer coefficient and cooling water temperature on crystal temperature are computer. The results show that changing heat transfer coefficient and water temperature of side hydrocooling method can change the whole temperature of the laser crystal, but not influence the temperature uniformity. The temperature of the crystal is the lowest, and the shape changed of the end face is the smallest by using the end surface hydrocooling method.