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理论分析了Er:YAG激光晶体的热退偏效应,模拟计算了该晶体棒端面退偏的分布,并进行了偏光干涉实验验证。结果表明,数值模拟和实验结果完全一致,热退偏效应随抽运能量增大而增强,退偏分布呈十字形,最大退偏发生在晶体棒端面上与起偏器偏振方向成45°方位处。同时,还阐明了一种利用临界稳定腔来测量灯抽运脉冲Er:YAG激光器有效热透镜焦距的简单方法,测量出不同抽运功率下Er:YAG晶体的等效热焦距。
The thermal depolarization effect of Er: YAG laser crystal was analyzed theoretically. The distribution of depolarization on the end face of the crystal rod was simulated and the polarization interference experiment was carried out. The results show that the numerical simulation is in good agreement with the experimental results. The thermal depolarization effect increases with the increase of pumping energy. The depolarization distribution is cross-shaped. The maximum depolarization occurs at the 45 ° orientation of the polarizer polarization plane Department. At the same time, a simple method of using the critical stability cavity to measure the focal length of the effective thermal lens of a lamp-pumped Er: YAG laser was also described. The equivalent thermal focal length of Er: YAG crystal under different pumping powers was measured.