基于LD端面泵浦掺镱硅酸钇(Yb3+:Y2 SiO5)晶体的激光特性, 考虑晶体侧面的热对流, 通过有限差分法求解各向异性介质热传导方程, 得到了该晶体的温度场分布、端面热形变分布, 计算了在不同泵浦功率下的热焦距。同时比较了考虑晶体侧面热对流系数前后的热焦距, 并进行了实验测量, 结果表明热焦距随泵浦功率的变化趋势同理论结果相符。

Based on the features of LD end-pumped Yb3+:Y2 SiO5 laser crystal and considering the convective heat transfer on the side faces, the temperature distribution, pumped-face distortion and thermal focal length under different pump power were obtained by solving anisotropy heat conductive equation through finite difference method. The thermal focal lengths before and after considering the heat-transfer coefficients were calculated respectively. And the thermal focal length was further measured experimentally. The experiment results demonstrate that the tendency of thermal focal length changing with pump power agrees well with the theoretical result.