Abstract

We report on the mid-infrared laser operation of a cubic 15 at.% ${{\rm Er}^{3 +}}\!:\!{\rm KY}_3{{\rm F}_{10}}$ crystal. In the quasi-continuous-wave regime, the peak power reaches 255 mW at 2.80 µm (the $^4{{\rm I}_{11/2}} \to {^4}{{\rm I}_{13/2}}$ transition) with a slope efficiency of 10.9% and a laser threshold of 58 mW. Two pumping schemes (to the $^4{{\rm I}_{11/2}}$ and $^4{{\rm I}_{9/2}}$ states) are compared. The emission properties of the ${{\rm Er}^{3 +}}$ ions in ${\rm KY}_3{{\rm F}_{10}}$ are studied, indicating high stimulated-emission cross-section of ${0.57} \times {{10}^{- 20}}\;{\rm cm}^2$ at 2.80 µm, a large gain bandwidth of 40 nm, and a long $^4{{\rm I}_{11/2}}$ state lifetime of 4.64 ms.

© 2021 Optical Society of America

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