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

Abstract

In this work, ultrafast Yb-doped fiber laser was realized using multi-layer palladium diselenide (PdSe[Formula: see text] film as the saturable absorber, which was prepared by simple selenization of palladium film deposited by magnetron sputtering method. The prepared polycrystalline PdSe2 film has a thickness of about 12[Formula: see text]nm. At a pump power of 180[Formula: see text]mW, the obtained mode-locked fiber laser based on the PdSe2 film has a central wavelength of 1063.75[Formula: see text]nm, a pulse width of 615[Formula: see text]ps, a repetition rate of 17.66[Formula: see text]MHz, and an output power of 4.43[Formula: see text]mW, respectively. These results indicate that PdSe2 has great potential in applications of ultrafast lasers.