We report room-temperature mid-IR laser operation in a new low-phonon-frequency nonhygroscopic host crystal, calcium thiogallate (CaGa₂S₄) . Laser action at 4.314.38 μm on the Dy³⁺H_11/2⁶→H_13/2⁶ transition occurred with a maximum slope efficiency of 1.6%.

© 1999 Optical Society of America

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