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通过建立激光晶体热传导模型,针对相同基质YAG晶体不同掺杂离子,求解泊松方程,得到不同Nd3+和Yb3+掺杂浓度的YAG晶体内温度场分布,并进行了对比分析。研究结果表明:在相同条件下,随着Nd3+和Yb3+掺杂浓度的增加,YAG晶体端面中心温度升高,晶体中心轴温度衰减越快,热焦距越小;当Yb3+掺杂浓度达到Nd3+掺杂浓度的近10倍时,热效应基本相同。这一结论为降低同基质晶体的热效应提供了理论依据。
The temperature field distribution in YAG crystals with different doping concentrations of Nd3 + and Yb3 + was obtained by establishing the model of laser crystal heat conduction for different dopant ions in the same host YAG crystal. The Poisson’s equation was solved and compared. The results show that with the increase of doping concentration of Nd3 + and Yb3 +, the center temperature of YAG crystal increases, and the center axis of the YAG crystal decays more rapidly and the thermal focal length decreases with increasing Nd3 + and Yb3 + doping concentration. When Yb3 + doping concentration reaches Nd3 + doping Nearly 10 times the concentration, the thermal effect is basically the same. This conclusion provides a theoretical basis for reducing the thermal effect on the host crystal.