Layered Ta2NiS5 Q-Switcher for Mid-Infrared Fluoride Fiber Laser

We have demonstrated the stable Q-switched Er-doped fluoride fiber laser with the help of the few-layered Ta
₂
NiS
₅
in the mid-infrared spectral range. We fabricated the mid-infrared saturable absorber mirror (SAM) by depositing the layered Ta
₂
NiS
₅
on a gold mirror. The layered Ta
₂
NiS
₅
exhibited saturable absorption behavior with modulation depth 36% and saturation intensity 32.2 GW/cm
²
at 2800 nm, respectively. With the Ta
₂
NiS
₅
-SAM, stable Q-switched pulses around 2.8 μm wavelength can be delivered with a pulse duration of 1.20 μs and a repetition rate of 102 kHz under an incident pump power of 860 mW from the ZBLAN fiber laser cavity. The experimental results confirm that Ta
₂
NiS
₅
has great potentials as broadband saturable absorber in mid-infrared regions, paving the way for the application of low-dimensional ternary chalcogenide in broadband optoelectronic devices.