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对激光二极管(LD)端面抽运圆柱状Nd∶YAG晶体产生946 nm激光的热效应进行了分析,考虑了晶体的三能级结构和腔内传播功率分布,修改了热转换系数,得出了更符合实际的晶体内部温度场分布。在抽运功率为15 W时,晶体端面中心的温度由未修改参数前的156.83℃变为246.7℃,提高了89.87℃。对修改参数前后的热焦距进行了计算对比,并对热焦距进行了实验测量,实验结果与理论结果基本吻合。该方法适用于准三能级、三能级激光热效应研究,分析及计算结果为LD端面抽运的固体激光器件的热效应研究及谐振腔优化设计提供一定的参考。
The thermal effect of the 946 nm laser produced by pumping cylindrical Nd:YAG crystal on the end surface of a laser diode (LD) was analyzed. The three-level structure of the crystal and the distribution of power in the cavity were considered. The thermal conversion coefficients were modified, In line with the actual temperature distribution inside the crystal. At pumping power of 15 W, the temperature at the center of the crystal face was changed from 156.83 ° C before the unmodified parameter to 246.7 ° C, an increase of 89.87 ° C. The thermal focal distances before and after modifying the parameters are calculated and compared, and the thermal focal length is measured experimentally. The experimental results are in good agreement with the theoretical ones. The method is suitable for the study of quasi-three-level and three-level laser thermal effects, and the analysis and calculation results provide some references for the thermal effect study and cavity optimization design of LD end-pumped solid-state laser devices.