Nd:YAG方形薄片激光介质应力双折射及退偏损失

在高功率Nd:YAG激光器中,由于部分抽运能量转化为热能沉积在介质之中,以及不均匀的冷却,导致激光介质内的温度分布不均匀,温度梯度进一步导致了介质内应力双折射、热透镜等热效应。模拟计算了Nd:YAG薄片激光介质在一定温度和应力分布条件下的应力双折射,并模拟计算了线偏振光通过该薄片介质后的退偏损失,计算结果与实验结果相符合。总结了一套计算晶体应力双折射的数值方法,并在此方法基础上编制了相应的MATLAB程序,为晶体应力双折射的消弱和退偏损失的补偿提供参考。

Abstract

In high power Nd:YAG laser,because of some pump energy transforming to heat and accumulating in laser media,and inhomogeneous cooling,which leads to the destribution of temperature in media nouniform. Furthermore the grads of temperature lead to heat effect,such as stress birefringence,thermal lens. In this paper the stress birefringence in the media is calculated when the media is under the condition of given destribution of temperature and stress;the loss of thermal depolarization is calculated when polarization light propagates though this media. The results of calculations are consistent with the experiment. Summarizing a simple method of numerical calculating stress birefringence,and developing relevant MATLAB program,which prodives reference for weakening stress birefringence and compensating the loss of thermal depolarization.

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李刚, 冯国英, 李玮, 杨火木, 黄宇, 周寿桓. Nd:YAG方形薄片激光介质应力双折射及退偏损失[J]. 中国激光, 2010, 37(1): 38. Li Gang, Feng Guoying, Li Wei, Yang Huomu, Huang Yu, Zhou Shouhuan. Stress Birefrigence and Thermal Depolarization in Nd:YAG Square Thin Slice Laser Media[J]. Chinese Journal of Lasers, 2010, 37(1): 38.

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