▎ 摘　　要

A van der Waals heterostruction formed by combaied the graphene and MoS2 nanosheets was fabricated. The optical characteristics of MoS2-graphene heterojuncture were reported. By using this saturable absorber, passively Q-switched mode-locked operation with 306 ps pulses was obtained. With simpler manufacturing progress and better optical properties, the heterojunction saturable absorbers have great potential used in solid state and fiber lasers.