Abstract

Our work reports the preparation of zirconium selenide (${{\rm ZrSe}_2}$)-polyvinyl alcohol (PVA) film-type saturable absorber (SA) and its nonlinear absorption performance in obtaining dark soliton and dark-bright soliton pairs in an Er-doped fiber (EDF) laser for the first time, to the best of our knowledge. The saturation intensity and modulation depth of the ${{\rm ZrSe}_2}\text{-}{\rm PVA}$ SA were $\sim{12.72}\;{{\rm MW/cm}^2}$ and 2.3%, respectively. Due to the modulation of the SA, under a pump power of 525.2 mW, stable dark soliton operation with an average output power of 9.75 mW, and a pulse repetition frequency of 20.84 MHz, a pulse width of 3.85 ns was attained successfully. By adjusting the state of the polarization controllers, dark-bright soliton pairs were also observed. To the best of our knowledge, this was the first demonstration focusing on the nonlinear optical absorption applications of ${{\rm ZrSe}_2}$ in obtaining dark soliton and dark-bright soliton pairs. Our results show that ${{\rm ZrSe}_2}$ is a good two-dimensional SA material for acting as an ultrafast optical device due to its suitable nonlinear optical absorption properties.

© 2020 Optical Society of America

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