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对LD端面泵浦圆柱形Nd:YAG晶体产生946 nm激光的晶体热效应进行了分析。考虑晶体的准三能级结构和腔内传播功率的分布,对热转换系数进行了修改,得到了更符合实际情况的晶体内部温度场分布。当泵浦功率为15W时,晶体端面中心温度由未修改参数前的242.73℃升高到了387.43℃,提高了144.70℃。分别对修改参数前后的热透镜焦距进行了理论计算,并进行了实验测量。实验测量结果和修改参数后的理论计算值相符合。此理论将为激光谐振腔的优化设计、准三能级和三能级的热效应研究提供参考。
The thermal effect of the 946 nm laser produced by LD end-pumped cylindrical Nd: YAG crystal was analyzed. Considering the quasi-three-level structure of the crystal and the distribution of the propagating power in the cavity, the thermal conversion coefficient has been modified to obtain the more accurate temperature distribution inside the crystal. When the pump power is 15W, the center temperature of the end face of crystal increases from 242.73 ℃ before unmodified parameter to 387.43 ℃, which is increased by 144.70 ℃. The focal lengths of the thermal lens before and after modifying the parameters were calculated theoretically and experimentally. The experimental results agree well with the theoretical ones after the parameters are modified. This theory will provide reference for the optimization design of laser cavity, quasi-three-level and three-level thermal effects.