▎ 摘　　要

A reflective graphene oxide saturable absorber is fabricated and used in a Q-switched and mode-locked YVO4/Nd:YVO4/YVO4 laser. Stable Q-switched and mode-locked pulses with a repetition rate of 8 MHz can be obtained at a pump power of 9 W by using an X-type resonator. Pulses obtained in an X-type resonator possess higher stability, output power, and repetition rate, compared with those in a Z-type resonator. The pulse width and the repetition rate of the Q-switched envelop in an X-type resonator are superior to those in the reported Q-switched and mode-locked lasers with graphene oxide.