Passively $Q$ -Switched 2.95- $\\mu$ m Bulk Laser Based on Rhenium Disulfide as Saturable Absorber

Abstract

Rhenium disulfide (ReS₂), one of the typical representatives of 2D layered transition metals dichalcogenide materials, has attracted widespread attention for its optical modulation properties in lasers. In this letter, a high-quality ReS₂ nanosheet film-based saturable absorber (SA) was successfully prepared by a liquid phase exfoliation method and employed into a passively <inline-formula> <tex-math notation= LaTeX >$Q$ </tex-math></inline-formula>-switched Ho,Pr:LiLuF₄ bulk laser operating at <inline-formula> <tex-math notation= LaTeX >$2.95~\\mu \\textrm {m}$ </tex-math></inline-formula>. The maximum output power of 103 mW was obtained with the shortest pulse duration of 676 ns and a repetition rate of 91.5 kHz, corresponding to the single pulse energy of <inline-formula> <tex-math notation= LaTeX >$1.13~\\mu \\textrm {J}$ </tex-math></inline-formula> and a pulse peak power of 1.67 W, respectively. The results indicate that ReS₂ is a promising SA for mid-infrared pulse generation.