Abstract

We report over 2 W of single spatial-mode output power at $1.5 \mathit{\mu }\mathrm{m}$ from an 8-cm-long, large-core phosphate fiber laser. The fiber has a numerical aperture of $\simeq 0.17$ and a $25‐\mathit{\mu }\mathrm{m}$-wide core, heavily doped with 1% ${\mathrm{Er}}^{+3}$ and 8% ${\mathrm{Yb}}^{+3}$. The laser utilizes a scalable evanescent-field-based pumping scheme and can be pumped by as many as eight individual multimode pigtailed diode laser sources at a wavelength of 975 nm. Nearly diffraction-limited laser output with a beam quality factor $M^2\simeq 1.1$ is achieved by use of a simple intracavity all-fiber spatial-mode filter. Both spectrally broadband and narrowband operation of the laser are demonstrated.

© 2005 Optical Society of America

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