Abstract

In this work, a saturable absorber (SA) based on ${\rm{C}}{{\rm{r}}_2}{\rm{S}}{{\rm{i}}_2}{\rm{T}}{{\rm{e}}_6}$ (CST), with a modulation depth of 14.90% and saturation intensity of ${4.81}\;{\rm{MW/c}}{{\rm{m}}^2}$, was prepared by a liquid phase stripping method. Its nonlinear optical properties and application in obtaining mode-locked pulse output of bright-dark solitons are studied. When the pump power was 1250 mW, the maximum output power was 26.60 mW; the energy of the single pulse was 15.02 nJ, and the repetition rate was 1.77 MHz. Our results provided evidence that CST can be used as an excellent SA for a mode-locked laser and demonstrated that ferromagnetic insulators can be used for the study of bright-dark soliton pairs.

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