基于热致双焦点选模的径向、切向偏振激光器  

Radially or Azimuthally Polarized Laser Based on Mode Selection of Thermally Induced Bifocus

作　　者：于益[1] 庞毓[1] 孙殷宏[1] 王卫民[1] 高清松[1] 

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《中国激光》2010年第10期2451-2455,共5页Chinese Journal of Lasers

摘　　要：侧抽运Nd∶YAG棒对径向偏振光和切向偏振光具有不同的热焦距,利用He-Ne激光器输出的线偏振光和旋转狭缝测量Nd∶YAG棒的径向、切向热焦距,设计谐振腔使得只有一种偏振光能低损耗稳定振荡。在440 W抽运功率下,获得31.7 W径向偏振激光,光束质量因子M2约为2.5,调整腔长后,在470 W抽运功率下,获得30.2 W切向偏振激光,光束质量因子M2约为2.8。实验结果表明,利用热致双焦点选模可以获得较大功率的径向、切向偏振激光输出,但激光器对抽运功率敏感。Side-pumped Nd∶YAG rods have different radial and azimuthal thermal focal lengths.Radial and azimuthal thermal focal length are measured with rotary slit and polarized He-Ne laser.A laser oscillator is designed to produce low-loss stable oscillation in a single polarization.At the pumped power of 440 W,radially polarized beam at 31.7 W with M2=2.5 is achieved.And at the pumped power of 470 W,azimuthally polarized beam at 30.2 W with M2=2.8 is achieved.The results show that radially or azimuthally polarized beam with higher power can be achieved with mode selection of thermally induced bifocus,but the laser is sensitive to pumped power.

关 键 词：激光器 径向偏振 切向偏振 热致双焦点 

分 类 号：TN248.1[电子电信—物理电子学]