ZrSe nanosheet as saturable absorber for soliton operations within an Er-doped passive mode-locked fiber laser.

Two-dimensional materials have extensively promoted the development of ultrafast photonics in the past decade. In our work, the saturable absorption properties of were presented. The saturation intensity, modulation depth, and nonlinear absorption coefficient of the saturable absorber (SA) are about 13.14/, 6.09%, and 1.85∗10/. In the experiment, based on the SA, two types of solitons were recorded. A conventional soliton with a pulse width of 985 fs and a three-pulse bound state soliton have been obtained. Our experiment reveals that can be employed for generating multiple ultrafast soliton generations and possess promising application in ultrafast photonics.