Heterojunction saturable absorption mirror, preparation method thereof, and pulse fiber laser

The invention belongs to the technical field of lasers and provides a heterojunction saturable absorption mirror, a preparation method thereof and a pulse fiber laser. The heterojunction saturable absorption mirror comprises a substrate, a gold film layer covered on the substrate, and an atomic-shell two-dimensional material film covered on the gold film layer. The atomic-shell two-dimensional material film comprises an atomic-shell two-dimensional material slow saturable absorption body heterojunction thin film, an isolation material and an atomic-shell two-dimensional material fast saturable absorption body heterojunction thin film, wherein the atomic-shell two-dimensional material slow saturable absorption body heterojunction thin film, the isolation material and the atomic-shell two-dimensional material fast saturable absorption body heterojunction thin film are sequentially arranged. According to the technical scheme of the heterojunction saturable absorption mirror, different atomic-shell two-dimensiona