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
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3580) Lasers and laser optics : Lasers, solid-state
(160.2750) Materials : Glass and other amorphous materials
(160.3380) Materials : Laser materials
T. Sandrock, A. Diening, and G. Huber, "Laser emission of erbium-doped fluoride bulk glasses in the spectral range from 2.7 to 2.8 μm," Opt. Lett. 24, 382-384 (1999)