Abstract

We report a novel short-length diode-pumped cw fiber laser with high output power at a wavelength of $2.8 \mathit{\mu }\mathrm{m}$. The system combines continuous-wave diode pumping at 970 nm, a high doping concentration (5-mol. % ${\mathrm{ErF}}_3$) of the active fiber, and an annular geometry of the laser medium, an M-profile fiber. Output powers in excess of 1 W with a slope efficiency of 25% were obtained.

© 1999 Optical Society of America

Laser emission of erbium-doped fluoride bulk glasses in the spectral range from 2.7 to 2.8 ?m

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