We demonstrate the first all-chalcogenide ring fiber laser as well as the first all chalcogenide Brillouin fiber laser. The compact device is made from the combination of an As2Se3 optical fiber coupler for the insertion of pump light and extraction of laser light, as well as an As2Se3 nonlinear gain fiber to ensure laser oscillation. Thanks to the strong Brillouin gain of As2Se3 , only 3 m of amplifying fiber is required to reach laser threshold, thus making a resonant cavity with a free spectral range significantly larger than the Brillouin gain spectrum. The laser therefore naturally enables single longitudinal mode operation without additional filtering device. Acting as a coherence enhancing component, the resulting proof of concept Brillouin laser benefits of a linewidth reduction factor of 7 with respect to the pump laser.
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