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理论分析了Cr,Tm,Ho:YAG激光晶体的热退偏效应,模拟计算了该晶体棒端面退偏度的分布,并进行了偏光干涉实验验证.结果表明,数值模拟和实验研究结果完全一致,热致退偏效应随抽运能量增大而增强,退偏度分布呈十字形,最大退偏度发生在晶体棒端面上与起偏器偏振方向成45°方位处.以此提出了高能量Cr,Tm,Ho:YAG激光器的热退偏补偿方法,获得了激光脉冲能量提高24%以上的实验效果.
The thermal depolarization effects of Cr, Tm and Ho: YAG laser crystals were analyzed theoretically, and the depolarization distribution of the crystal rod ends was simulated and the polarization interference experiments were carried out. The results show that the numerical simulation and experimental results are completely consistent , The thermally induced depolarization effect increases with the increase of pumping energy, and the distribution of de-skewness is cross-shaped, and the maximum de-skewness occurs at the azimuth of 45 ° with respect to the polarization direction of the polarizer on the crystal rod end face. Energy Cr, Tm, Ho: YAG laser thermal depolarization compensation method, the laser pulse energy is increased by more than 24% of the experimental results.