▎ 摘　　要

The large-area and high-quality monolayer graphene film was grown on Cu foil by chemical vapor deposition (CVD) technique. A stable diode-pumped passively mode-locked Tm:YAP laser using the high-quality monolayer graphene as saturable absorber (SA) was accomplished for the first time. Under the absorbed pump power of 7.67 W, the maximum output power was 256 mW at the center wavelength of 1988.5 nm. The pulse train with a repetition rate of 62.38 MHz was generated with the highest single pulse energy of 4.1 nJ. Our work displays that graphene was a promising saturable absorber in making low-cost and ultrafast lasers.