We report on the first, to our knowledge, mid-infrared laser operation of two Er-doped barium-containing fluorite-type crystals, BaF and (Sr,Ba)F, featuring a low-phonon energy behavior. A continuous wave 4.9 at.% Er:(Sr,Ba)F laser generated 519 mW at 2.79 µm with a slope efficiency of 25.0% and a laser threshold of 27 mW. The vibronic and spectroscopic properties of these crystals are determined. The phonon energy of (Sr,Ba)F is as low as 267 cm. The Er ions in this crystal feature a broadband emission owing to the I → I transition and a long luminescence lifetime of the I level (10.6 ms) making this compound promising for low-threshold, broadly tunable, and pulsed 2.8-µm lasers.
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