2μm Cr,Tm,Ho:YAG激光热退偏效应的数值模拟及实验研究  

Numerical simulation and experimental study of thermal-induced-depolarization in 2μm Cr,Tm,Ho:YAG laser

作　　者：李哲[1] 江海河[1] 王礼[1] 杨经纬[1] 吴先友[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031

出　　处：《物理学报》2012年第4期228-232,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:90922003);中国科学院知识创新工程重点方向项目(批准号:KJCX2-EW-NO7)资助的课题~~

摘　　要：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 theory of thermal-induced-depolarization is analyzed,the distribution of depolarization is numerically simulated,and the result is verified by the polarized light interferometry.The experimental result is coincident with the numerical simulation,which shows that the distribution of depolarization in the cross section of Cr,Tm,Ho：YAG is crisscross,and increases with the pump energy increasing.The direction of the worst depolarization is 45°with respect to the polarization direction of the polarizer.According to the numerical simulation,we employ aλ/4-plate to compensate the depolarization of a high-energy Cr,Tm,Ho：YAG laser.The pulse energy increases by 24%after compensation.

关 键 词：CR TM HO:YAG 热退偏效应 数值模拟 偏光干涉 

分 类 号：TN248[电子电信—物理电子学]