Preparation of large-area uniform PdSe2 film and its application in ultrafast fiber laser

In this work, ultrafast Yb-doped fiber laser was realized using multi-layer palladium diselenide (PdSe 2 ) film as the saturable absorber, which was prepared by simple selenization of palladium film deposited by magnetron sputtering method. The prepared polycrystalline PdSe 2 film has a thickness of about 12 nm. At a pump power of 180 mW, the obtained mode-locked fiber laser based on the PdSe 2 film has a central wavelength of 1063.75 nm, a pulse width of 615 ps, a repetition rate of 17.66 MHz, and an output power of 4.43 mW, respectively. These results indicate that PdSe 2 has great potential in applications of ultrafast lasers.