LD侧泵激光器抽运光和温度分布数值研究

Simulation of Absorbed Power and Temperature Distribution in LD Side-pumped Laser

摘要:

基于光线追迹法和有限差分法，计算了不同参数下光LD侧面抽运激光棒时吸收的功率和温度分布。模拟计算结果表明不同的抽运头结构对抽运光功率和温度分布有重要影响。随着抽运方向的增多，抽运光功率和温度分布越来越对称。介绍了一些提高抽运光和温度分布均匀性的方法。研究了激光棒横截面内的温度与热传导系数的关系，该温度随热传导系数的增大非线性减小，在一定的抽运功率条件下，热传导系数存在着一个最佳值。

Abstract:

Ray-tracing algorithm and finite difference method were used to simulate the absorbed power and temperature distributions in crystal rod for different side-pumping configurations.Simulation results show that there have importance inluences on the absorbed power and the temperature distributions at different pumping configurations and parameters.With the increase of pumping sides,both the absorbed power and the temperature distributions with in the crystal are gradually becoming a symmetric distribution about the crystal axis.Some methods to increase the uniformity of the absorbed power distributions are introduced.The relation between the temperature in the cross-section of the laser rod and the heat transfer coefficient is investigated.The former nonlinearly decreases with the increase of the latter,and the coefficient has an optimal value.Therefore,an appropriate flow rate should be chosen according to different pumping power.