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为了解决激光二极管泵浦激光晶体产生的热效应问题,对激光晶体内的温升进行了解析分析与定量计算。通过对激光二极管端面泵浦激光晶体工作特点的分析,建立了符合实际工作情况的热模型。考虑到晶体材料热传导系数受其宏观温度变化的影响,应用常数变易法以及特征函数法得到了变热传导系数Nd:YAG晶体棒在端面泵浦情况下温度场的一般表达式。定量计算了激光二极管超高斯分布泵浦光阶次、泵浦功率、光斑尺寸以及晶棒半径对其温度场分布的影响。研究结果表明:使用输出功率为60 W的激光二极管端面泵浦掺钕离子质量分数1.0%的Nd:YAG晶棒,若耦合入射的3阶超高斯光束泵浦光斑半径为400μm,晶棒半径为1.5 mm,长度为8 mm时,Nd:YAG棒内最大温升为343.9℃;而将其热导率视为定值时,晶体的最大温升只有222.7℃。研究结果为正确计算Nd:YAG晶体温度场分布提供了方法,并为提高全固态Nd:YAG激光器性能提供了理论依据。
In order to solve the thermal effect caused by the laser diode laser diode laser, the temperature rise in the laser crystal is analyzed and calculated quantitatively. By analyzing the working characteristics of the laser diode end-pumped laser crystal, a thermal model that meets the actual working conditions was established. Considering the influence of macroscopic temperature on the thermal conductivity of crystal material, the general expression of the temperature field of the Nd: YAG crystal rod with end-pumped heating is obtained by the method of constant variation and the method of characteristic function. The effects of pump light order, pumping power, spot size and crystal rod radius on the temperature field distribution of the laser diode are calculated quantitatively. The results show that Nd: YAG Nd: YAG crystal with 1.0% Nd ions is end-pumped by a laser diode with an output of 60 W, and the radius of the crystal rod is 1.5 mm and length of 8 mm, the maximum temperature rise in the Nd: YAG rod is 343.9 ℃. When the thermal conductivity is taken as the fixed value, the maximum temperature rise of the crystal is only 222.7 ℃. The results provide a method for correctly calculating the temperature field distribution of Nd: YAG crystal and provide a theoretical basis for improving the performance of all-solid-state Nd: YAG laser.