LD抽运热容激光器介质内温度分布研究

Study of the temperature distribution in the medium in a diode-pumped heat capacity laser

采用有限元法及光线追迹法,计算得到二极管抽运固体热容激光器介质不同截面内抽运光分布及瞬态的温度三维分布,计算同时考虑了二极管在快轴和慢轴方向的发散特性及介质内不均匀分布的内热源.对二极管抽运单片Nd:GGG热容激光器的实验装置,得到1.49 kW的平均功率激光输出和24.1%的光-光转换效率,1.2 s后,介质端面中心处温度为81℃,模拟结果为78.1℃.

The pump distribution and the transient three-dimensional temperature distribution in the medium of a diode pumped heat capacity laser are simulated by the ray tracing method and the finite element method. A diode face-pumped single chip Nd： GGG heat capacity laser is designed. The output power is 1.49kW with an optical-optical efficiency of 24.1%. When the working time is 1.2s, the experimental temperature at the center of surface of heat capacity laser is 81℃, and the simulation result is 78.1℃, which coincide well with each other.