A Tm-doped large mode area (LMA) silica fiber laser has been locked to a stable wavelength of $2053.9\mathrm{nm}$ using a volume Bragg grating (VBG). The measured spectral width of the laser output was $<300\mathrm{pm}$ , limited by the spectrometer resolution. Although this laser had modest output $(\sim 5\mathrm{W})$ and slope efficiency (41%), this new approach to spectrally limiting the output of LMA fiber lasers is inherently extendable to kilowatt powers, opening up several applications including high-power pulsed fiber lasers and spectral beam combining. Performance characteristics of the laser compared to one using a dielectric mirror as a high reflector are described, and the results imply low VBG losses.

© 2008 Optical Society of America

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