中文摘要：

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）976nm激光二极管端抽运Yb：SSO激光特性。在重复频率为50Hz、脉冲宽度为500μs、峰值抽运功率为128．8W时，得到峰值功率为27．6W的激光输出，光一光转换效率为21．4％。此时x和y方向上的光束质量因子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。

英文摘要：

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 factors （M2） 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.