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。

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.