光学学报, 2014, 34 (s1): s114001, 网络出版: 2014-06-24
半导体抽运[100]和[111]切割方向Nd:YAG激光器被动调Q实验的研究
Investigation of Diode Pumped Passively Q-Switched [100]-and [111]-Cut Nd:YAG Laser
摘要
热应力双折射产生的热退偏是限制Nd:YAG激光器线偏振输出功率的重要因素,相比于传统[111]切割方向Nd:YAG晶体,[100]切割方向Nd:YAG晶体的热退偏与振荡光偏振方向有关,通过寻找合适的偏振方向,能够显著提高[100]切割方向Nd:YAG激光器的线偏振输出功率。采用半导体端面抽运[111]和[100]切割方向的Nd:YAG晶体棒,使用Cr4+:YAG晶体作为被动调Q晶体,进行被动调Q对比实验研究。实验结果表明,相比于传统的[111]切割方向Nd:YAG晶体棒,采用半导体抽运[100]切割方向Nd:YAG晶体棒进行被动调Q,能够获得稳定、高消光比的线偏振光激光输出,输出激光消光比为5001,稳定度高于96.5%。
Abstract
Thermal depolarization caused by birefringence is a major factor that limits the output power of linearly polarized Nd:YAG laser. Compared with conventional [111]- cut Nd:YAG rod, the thermal depolarization depends on the polarization direction for the [100]- cut Nd:YAG rod. The linearly polarized output power can be improved by suitable modification of the polarization direction of oscillate laser. The [111]- and [100]- cut Nd:YAG rods are used as the gain medium and the Cr4+:YAG crystal is used as the saturable absorber for passively Q-switched laser. The experiment demonstrates that in comparison with conventional [111]- cut Nd:YAG rod, highly stabled output with high extinction is achieved by using the [100]- cut Nd:YAG rod as the laser crystal. The extinction ratio is 5001 and polarized output stability is higher than 96.5%.
孙哲, 程秋桐, 姜梦华, 惠勇凌, 雷訇, 李强. 半导体抽运[100]和[111]切割方向Nd:YAG激光器被动调Q实验的研究[J]. 光学学报, 2014, 34(s1): s114001. Sun Zhe, Cheng Qiutong, Jiang Menghua, Hui Yongling, Lei Hong, Li Qiang. Investigation of Diode Pumped Passively Q-Switched [100]-and [111]-Cut Nd:YAG Laser[J]. Acta Optica Sinica, 2014, 34(s1): s114001.