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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%。
In the high power solid state laser, due to the complex interaction between the pump light distribution and the thermal effect, the processing method under the low power can not be used in the theoretical analysis of the thermal effect, otherwise it will bring great error. A numerical method of iterative iterative process is proposed. The interaction between pump light and thermal effect is fully considered. On the basis of this, the thermal effects and pump light distribution of some typical end-pumped solid-state lasers are analyzed. Regardless of the theoretical calculation error caused by this interaction. By comparing the absorption length of the pump with the thermal focal length of the rough lens, a parameter K for determining the interaction between the thermal effect and the pumping light is proposed. According to the value of K, we can determine whether the two parameters need to be considered in the theoretical analysis Interaction of people. The research shows that when K is less than 0.1, the effect of the interaction between pump light and thermal effect is less than 3%.