Abstract

We demonstrate broadband mid-infrared cascaded stimulated Raman scattering (SRS) and flat supercontinuum (SC) generation in a chalcogenide optical fiber made from ${{\rm As}_2}{{\rm S}_5}$ glass. By using a 2 µm nanosecond laser as the pump source, mid-infrared cascaded SRS up to six orders ranging from 2149 to 3425 nm was experimentally observed, and this all-fiber Raman laser operating at 3.43 µm was realized for the first time to our knowledge. By introducing a 2 µm femtosecond laser as the excited source, the broadband flat mid-infrared SC with the spectral range of ${\sim}{10}\;{\rm dB}$ (from ${\sim}{1030}$ to 3441 nm) was observed. Our results verify that the ${{\rm As}_2}{{\rm S}_5}$ optical fibers possess promising applications for tunable mid-infrared Raman fiber lasers and SC light sources pumped by 2 µm pulsed lasers.

© 2021 Optical Society of America

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