Abstract

We report on the laser emission of erbium-doped fluoride glasses in the spectral range from 2.7 to 2.8 μm . The pump source was a fiber-coupled InGaAs semiconductor laser emitting near λ<sub><i>p</i></sub>~970 nm . The laser performance of bulk samples with various ErF<sub>3</sub> contents was investigated with respect to the optimum doping concentration, which is estimated to be higher than 8 mol. %. A maximum output power of <i>P</i><sub>out</sub> > 160 mW and a slope efficiency of η = 10% were achieved. Results are compared with previously published data on erbium-doped ZBLAN fiber and LiYF<sub>4</sub> crystal lasers.

© 1999 Optical Society of America

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