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通过对半导体端面泵浦棒状Nd∶YAG晶体的热效应进行了理论分析,研究了端面抽运圆形截面激光晶体内部温度场,建立了符合条件的激光晶体热模型。考虑晶体侧面与冷却液之间的对流传热,以及晶体端面与外界非绝热边界条件,从而建立更为合理的边界条件,得出更符合实际的晶体的温度分布场。研究结果表明,考虑端面的对流传热后,计算的晶体中心温度降低,而相应的热焦距稍有增加;空气传热系数增加时,晶体中心温度明显降低,热焦距显著增加,减弱了晶体热效应。
By analyzing the thermal effect of the semiconductor end-pumped Nd: YAG crystal, the internal temperature field of the circular cross-section laser crystal is studied, and the laser crystal thermal model is established. Considering the convective heat transfer between the side of the crystal and the coolant and the non-adiabatic boundary condition between the crystal face and the outside, a more reasonable boundary condition is established to obtain a more realistic temperature distribution field of the crystal. The results show that the calculated center temperature of the crystal decreases with the increase of the convective heat transfer, while the corresponding focal length increases slightly. When the air heat transfer coefficient increases, the center temperature of the crystal decreases significantly and the thermal focal length increases significantly, which reduces the thermal effect of the crystal .