Abstract

1T-phase titanium diselenide ($1\mathrm{T}\text{-}{\mathrm{TiSe}}_2$), a model two-dimensional (2D) transition metal dichalcogenide, has attracted much attention due to its intriguing electrical and optical properties. In this work, a $1\mathrm{T}\text{-}{\mathrm{TiSe}}_2$-based high-quality large-area saturable absorber (SA) ($1\mathrm{T}\text{-}{\mathrm{TiSe}}_2\text{-}\mathrm{SA}$) was successfully fabricated with the liquid-phase exfoliation method. With the as-prepared $1\mathrm{T}\text{-}{\mathrm{TiSe}}_2\text{-}\mathrm{SA}$, a stable, passively $Q$-switched laser operating at 2.95 μm was first realized. Under an absorbed pump power of 3.35 W, the maximum average output power was 130 mW with a slope efficiency of 5%. A pulse width of 160.5 ns was obtained, which is the shortest among 3.0 μm passively $Q$-switched lasers ever achieved with 2D materials as SAs, to the best of our knowledge. The results indicate that $1\mathrm{T}\text{-}{\mathrm{TiSe}}_2$ is a promising alternative as a nonlinear optical modulator for short-pulse laser generation near the 3.0 μm mid-infrared region.

© 2018 Optical Society of America

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