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In this article, a high-quality saturable absorber (SA) based on a two-dimensional ternary chalcogenide Ta 2 NiS 5  nanosheet has been successfully fabricated and used in 1- and 1.5-μm spectral regions to generate ultrafast laser pulses. The Ta 2 NiS 5 -based SA is fabricated by mechanical exfoliation and sandwiched between two fiber ferrules to form a fiber-compatible SA. On the basis of the twin-detector technique, nonlinear optical absorption of the Ta 2 NiS 5 -SA is characterized by 64.7% and 11.95% modulation depths with 1.3 and 0.72 MW/cm 2  saturation intensities at 1028 and 1570 nm, respectively. When Ta 2 NiS 5 -SA is integrated into Yb- and Er-doped fiber laser cavities, stable self-starting Q-switched pulses are observed. Furthermore, by adjusting the cavity structure and optimizing dispersion in the cavity, we obtain hybrid mode-locking and mode-locking fiber laser operation at 1029 and 1569 nm, respectively. These results validate the performance of Ta 2 NiS 5  as a broadband SA for the generation of ultrafast laser pulses, offering new opportunities of ternary transition-metal dichalcogenide alloys in future photonic devices.

Ternary chalcogenide Ta 2 NiS 5 nanosheets for broadband pulse generation in ultrafast fiber lasers