Efficient high-power operation of double-clad Er,Yb-doped fiber lasers with fixed-wavelength and wavelength-tunable resonator configurations using volume Bragg gratings for wavelength selection are reported. The fixed-wavelength laser yielded a maximum output power of $103\mathrm{W}$ at $1552.6\mathrm{nm}$ with a linewidth of $\sim 0.4\mathrm{nm}$ (FWHM) for a launched pump power of $290\mathrm{W}$ at $976\mathrm{nm}$ . The wavelength-tunable laser could be tuned from 1528 to $1550\mathrm{nm}$ with a linewidth of $0.2\mathrm{nm}$ (FWHM) and with output power in the range $30–38\mathrm{W}$ for a launched pump power of $120\mathrm{W}$ . The prospects for further improvement in performance are considered.

© 2008 Optical Society of America

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