高功率固体激光器中抽运光和热效应的相互作用分析

大功率固体激光器中，由于抽运光分布和热效应之间存在复杂的相互作用，所以在对热效应的理论分析中不能沿用小功率下的处理方法，否则会带来很大的误差。提出一种反复迭代的数值处理方法，充分考虑抽运光和热效应之间的相互作用，在此基础上，对一些典型的端面抽运固体激光器的热效应和抽运光分布进行了分析，研究了不考虑这种相互作用所带来的理论计算的误差。将介质对抽运光的吸收长度和粗估的热透镜焦距进行比较，提出了一个用于判断热效应和抽运光相互作用强度的参数K，根据K的值可以判断在理论分析中是否需要考虑两者的相互作用。研究表明，当K小于0.1时，抽运光和热效应相互作用所产生的影响小于3%。

Abstract

In high power laser diode (LD) end-pumped solid-state laser, due to the complicated interaction between pump optical field distribution and thermal effect, the method of analysis thermal effect used in low power cannot be used, or leads to large error. In the light of the above, the concept of iteration used in calculation method can fully consider the interaction between pump optical field distribution and thermal effect. So, the interaction in some typical LD end-pumped solid-state laser is analyzed, and the calculation error without considering the interaction is studied. At the meanwhile, by comparing abortion length of solid-state laser material with its effect focal length, a parameter K is put forward to measure intensity of the interaction, and it can be used to judge whether considering the interaction or not. The results show that when the parameter K is less than 0.1, the influence of the interaction is below 3 percent.

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屈鹏飞, 王石语, 过振, 蔡德芳, 李兵斌. 高功率固体激光器中抽运光和热效应的相互作用分析[J]. 光学学报, 2014, 34(11): 1114002. Qu Pengfei, Wang Shiyu, Guo Zhen, Cai Defang, Li Bingbin. Analysis of Interaction Between Thermal Effect and Pump Optical Field Distribution in High Power Solid-State Laser[J]. Acta Optica Sinica, 2014, 34(11): 1114002.

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