中国激光, 2016, 43 (11): 1101007, 网络出版: 2016-11-10
端抽运准连续Yb∶SSO激光实验研究
Experimental Research on End-Pumped Quasi-Continuous Wave Yb∶SSO Laser
激光技术 准连续波 端面抽运 Yb∶SSO 固体激光器 laser technique quasi-continuous wave end pumping Yb∶SSO solid state laser
摘要
一种新型的掺镱硅酸盐晶体Yb3+∶Sc2SiO5(Yb∶SSO)因其良好的激光特性而在近年来受到关注。从理论上计算了Yb∶SSO晶体在不同的抽运功率情况下的热透镜焦距,分析了晶体材料负折射率系数对激光器的影响。实验中采用平平短腔结构,研究了准连续(QCW)976 nm激光二极管端抽运Yb∶SSO激光特性。在重复频率为50 Hz、脉冲宽度为500 μs、峰值抽运功率为128.8 W时,得到峰值功率为27.6 W的激光输出,光-光转换效率为21.4%。此时x和y方向上的光束质量M2为1.24和1.20。在实验中发现激光中心波长随抽运功率变化的规律,并理论分析了实验结果中双波长非同步起振的原因。
Abstract
A new Yb-doped silicate Yb3+∶Sc2SiO5 (Yb∶SSO) has gained considerable attention in recent years because of its advantageous laser properties. Thermal lens focal length of Yb∶SSO in the case of different pump powers is calculated theoretically, and the influence of the material negative refractive index on the laser is analyzed. Quasi-continuous wave (QCW) lasing performance of the Yb∶SSO end-pumped by a 976 nm laser diode (LD) in a plane-plane cavity is studied. Laser output with peak power of 27.6 W and optical-to-optical conversion efficiency of 21.4% is obtained when pump laser is with repetition rate of 50 Hz, pulse width of 500 μs and peak pump power of 128.8 W. Meanwhile, beam qualities (M2 factors) in x and y directions are 1.24 and 1.20, respectively. Finally, the law of center-wavelength movement caused by the change of pump power is observed, and the cause of dual-wavelength asynchronous oscillation is theoretically analyzed.
姜豪, 徐浏, 陈小明, 郑丽和, 童立新, 刘娇, 阮旭, 王君涛, 苏良碧, 高清松. 端抽运准连续Yb∶SSO激光实验研究[J]. 中国激光, 2016, 43(11): 1101007. Jiang Hao, Xu Liu, Chen Xiaoming, Zheng Lihe, Tong Lixin, Liu Jiao, Ruan Xu, Wang Juntao, Su Liangbi, Gao Qingsong. Experimental Research on End-Pumped Quasi-Continuous Wave Yb∶SSO Laser[J]. Chinese Journal of Lasers, 2016, 43(11): 1101007.