▎ 摘　　要

A passively Q-switched Ho:Sc2SiO5 laser operating at 2107.2 nm with a few layered graphene saturable absorber is obtained, corresponding to a beam quality factors ofM(x)(2)=1.19 andM(y)(2) =1.21. A maximum average output power of 1.37 W and pulse energy of 16.08 mu J was achieved at an incident pump power of 13.2 W. The shortest pulse width of 188.3 ns and maximum pulse repetition rate of 85.26 kHz were observed, with a maximum peak power of 85.4 W.