中国激光, 2017, 44 (7): 0701007, 网络出版: 2017-07-05
Nd∶YVO4晶体π和σ偏振激光的实现及性能研究 下载: 762次
Realization and Performance Study of π- and σ-Polarization Laser of Nd∶YVO4 Crystal
激光器 偏振选择器件 Nd∶YVO4晶体 偏振分束器 lasers polarization-selective devices Nd∶YVO4 crystal polarization beam splitter
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.
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. 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.