LDA侧面泵浦薄片激光器的泵浦光和温度分布

Study of the Pump and Temperature Distribution in Thin Disk Laser Side-pumped by LDA

建立了激光二极管阵列(LDA)环绕侧面泵浦复合薄片激光器的数值模型,LDA的快轴垂直于薄片表面并被压缩。依据LDA的输出光束特性,考虑到介质与空气的对流热交换和材料热导率的温度相关性,根据经典热传导方程,运用有限单元法,得出了薄片内的泵浦光和温度分布。分析了LDA个数、泵浦距离、吸收系数和光束发散角对薄片内泵浦光分布和吸收效率的影响规律,讨论了温度与泵浦功率、换热系数、冷却液温度和时间的变化规律,所得的有关规律与相关实验相符合。计算结果可为LDA泵浦固体激光器的结构优化设计和实验研究提供理论参考。

A numerical model of the thin composite disk side-pumped by ring laser-diode arrays （LDA） is set up. LDA fast axis is upright to disk face and is compressed. Under considering the influence of temperature correlation of the thermal conductivity of the material and heat transfer coefficient between air and medium, based on the thermal conduction equations, the pump distribution and the transient distributions of temperature in the thin disk are calculated by a finite element analysis method. The influence disciplinarian of the number of LDA, the pump distance, the light divergence angle and the absorption coefficient of thin disk on pump dis- tribution and absorption efficiency of thin disk are analyzed. The influence disciplinarian of the pump power, heat transfer coefficient, cooling fluid temperature and time on transient distributions of temperature in the thin disk are discussed. The theoretical results accord with interrelated experiment and provide theoretical reference for the design of solid laser pumped by LDA and experimental analysis.