High‐Performance Vanadium Diselenide Nanosheets for the Realization of Compact Pulsed Fiber Lasers

Abstract

AbstractVanadium diselenide (VSe2), as a transition metal dichalcogenides (TMDC), is an important class of graphene‐like 2D layered materials. It has excellent optical absorption nonlinearity, high thermal damage threshold, and large modulation depth, which can make it to be applied in the field of ultrashort pulse. Here, the nonlinear optical absorption properties of VSe2 are investigated along with in‐depth exploration of its ultrafast photonics performance. VSe2 is used as a saturable absorber (SA) in an erbium‐doped fiber ring laser to successfully generate a mode‐locked laser pulse with a central wavelength of 1565.3 nm, a repetition rate of 5.882 MHz, and a pulse width of 1.2 ps. What is noticeable is that the pulse has a high signal‐to‐noise ratio, which ensures that the mode‐locked pulse can remain stable for a long time. The results suggest that VSe2 as TMDC has potential applications in optical communications. Furthermore, this study expands the field of SA materials in fiber lasers.