Abstract

Efficient cw operation of the Er³⁺:GSGG ⁴I_11/2 → ⁴I_13/2 laser transition at 2.8 μm is demonstrated at room temperature. The ⁴I_11/2 upper laser state is directly pumped at 0.97 μm. The slope efficiency for the 2.8-μm laser is 36%, indicating a greater than unity quantum efficiency. This excess efficiency results from the recycling of population through upconversion out of the lower laser state.

© 1992 Optical Society of America

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