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.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第10期2451-2455,共5页
Chinese Journal of Lasers
关键词
激光器
径向偏振
切向偏振
热致双焦点
lasers
radial polarization
azimuthal polaration
thermal bifocus
