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Nd∶YVO4晶体π和σ偏振激光的实现及性能研究

Realization and Performance Study of π- and σ-Polarization Laser of Nd∶YVO4 Crystal

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摘要

利用偏振分束器(PBS)选择性地实现a轴切割Nd∶YVO4晶体π和σ偏振的激光输出的实验研究。四方晶系Nd∶YVO4晶体偏振荧光光谱的差异, 导致了输出π和σ偏振激光的性能差别。实验中利用PBS的反射光束主动选偏, 结合激光晶体沿通光方向旋转, 分别对a轴切割Nd∶YVO4晶体的4F3/2~4I11/2和4F3/2~4I13/2能级跃迁的偏振激光性能进行测试。在11 W的入射抽运功率下, 基于4F3/2~4I11/2能级跃迁分别获得了5.5 W的π偏振1064.3 nm激光输出和4.4 W的σ偏振1066.7 nm激光输出; 基于4F3/2~4I13/2能级跃迁分别获得了2.9 W的π偏振激光输出和1.6 W的σ偏振激光输出, 但波长均为1341.8 nm。实验结果表明:a轴切割Nd∶YVO4晶体的π偏振激光输出有更高的转换效率, 而σ偏振激光输出则有更长的激光谱线。

Abstract

π- and σ-polarization laser emission in a-cut Nd∶YVO4 crystal are selectively realized with a polarization beam splitter (PBS). The difference of polarized fluorescence spectra of tetragonal Nd∶YVO4 crystal results in the performance difference between the π- and σ-polarization laser outputs. The π- and σ-polarization laser performances of a-cut Nd∶YVO4 crystal with 4F3/2 to 4I11/2 and 4F3/2 to 4I13/2 energy level transitions are investigated by rotating the laser crystal along the optical direction and active polarization selection of PBS reflected beam. When the pump power is 11 W, π-polarization laser at 1064.3 nm with output power of 5.5 W and σ-polarization laser at 1066.7 nm with output power of 4.4 W are obtained for the 4F3/2-4I11/2 energy level transition, respectively. While for the 4F3/2-4I13/2 energy level transition, π-polarization laser at 1341.8 nm with output power of 2.9 W and σ-polarization laser at 1341.8 nm with output power of 1.6 W are obtained, respectively. The experimental results show that the π-polarization laser has higher conversion efficiency and the σ-polarization laser owns longer laser spectrum for a-cut Nd∶YVO4 crystal.

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中图分类号:O436

DOI:10.3788/cjl201744.0701007

所属栏目:激光物理

基金项目:国家自然科学基金(61505147)、浙江省公益技术应用研究(2015C35017, 2017C34008)、浙江省教育厅科研项目(Y201635542)、国家级大学生创新创业训练计划项目(201710351018)

收稿日期:2017-02-28

修改稿日期:2017-03-27

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俞叶:温州大学物理与电子信息工程学院, 浙江 温州 325035
段延敏:温州大学物理与电子信息工程学院, 浙江 温州 325035
郭俊宏:温州大学物理与电子信息工程学院, 浙江 温州 325035
张栋:温州大学物理与电子信息工程学院, 浙江 温州 325035
陈思梦:温州大学物理与电子信息工程学院, 浙江 温州 325035
廖小青:温州大学物理与电子信息工程学院, 浙江 温州 325035
朱海永:温州大学物理与电子信息工程学院, 浙江 温州 325035

联系人作者:俞叶(1229956882@qq.com)

备注:俞叶(1996-), 女, 本科, 主要从事新型激光器方面的研究。

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引用该论文

Yu Ye,Duan Yanmin,Guo Junhong,Zhang Dong,Chen Simeng,Liao Xiaoqing,Zhu Haiyong. Realization and Performance Study of π- and σ-Polarization Laser of Nd∶YVO4 Crystal[J]. Chinese Journal of Lasers, 2017, 44(7): 0701007

俞叶,段延敏,郭俊宏,张栋,陈思梦,廖小青,朱海永. Nd∶YVO4晶体π和σ偏振激光的实现及性能研究[J]. 中国激光, 2017, 44(7): 0701007

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