▎ 摘　　要

We demonstrate a passively-mode-locked Pr3+: LuLiF4 laser operated at the 604 nm orange wave-length, using monolayer graphene as a saturable absorber. The graphene saturable absorber mirror (SAM) is fabricated by a chemical vapour deposition method and transferred to on a highly reflective plane mirror. With a blue laser diode as the pump source, picosecond ultrafast laser pulses are generated at a repetition rate of 105 MHz with an average output power of 92 mW.