High power broadband mid-infrared supercontinuum fiber laser using a novel chalcogenide AsSe2 photonic crystal fiber

A high power supercontinuum (SC) based on a new type of chalcogenide AsSe₂ material for broadband mid-infrared light source is numerically reported. Ultra-broadband coherent mid-IR SC generation with more than 3 octave-spanning from 1.7 to 14 μm in a novel design of chalcogenide AsSe₂ photonic crystal fiber (PCF) is demonstrated. To the best of our knowledge and aiming to properly model the nonlinear propagation, an accurate fit of the Raman response function and the corresponding Raman gain of the novel AsSe₂ chalcogenide glass are proposed numerically for the first time. The obtained SC is generated by pumping at 3.9 μm in the anomalous dispersion regime in only 8 mm long fiber. Our study shows that the initially generated SC from 150 fs pulse duration with 8.8 kW peak power exhibits high power proportion of more than 80% for wavelengths beyond 3 μm which is very promising for designing high power SC fiber laser sources in the mid-IR atmospheric windows and the molecular fingerprint region.