As a representative transition metal dichalcogenides （TMD）， NiTe₂ has an ultra-fast optical response， high carrier mobility， and excellent environmental stability. It has a broad application prospect in the fields of energy， biomedicine， optoelectronic devices， and so on. At present， there have been scant reports on the application of NiTe₂ in the field of ultrafast photonics. In this work， NiTe₂ was synthesized by chemical vapor deposition （CVD） and integrated with a tapered optical fiber to achieve mode-locking in an erbium-doped fiber laser （EDFL） and a thulium-doped fiber laser （TDFL）. The mode-locked EDFL exhibited a pulse width of 678 fs and an output power of 3.92 mW. The pulse width of mode-locked TDFL was estimated to have a pulse width of 694 fs with an output power of 21.64 mW. These results demonstrate that NiTe₂ is an effective saturable absorber material with potential applications in the field of ultrafast optics.

NiTe₂;Transition metal dichalcogenides;Saturable absorber;Mode-locked fiber laser