We report, for the first time to our knowledge, fundamental-mode operation in polarization-maintaining ytterbium-doped fiber with an effective area of $\sim 1400\mu {\mathrm{m}}^2$ and birefringence of $2.1\times {10}^{-4}$ . The measured critical bending radius, $R_c$ , defined as the radius at which the loss is equal to $3\mathrm{dB}$ for $1\mathrm{m}$ of fiber, is $\sim 4\mathrm{cm}$ . Lasing with slope efficiency exceeding 60% and $M^2$ of 1.2 has also been demonstrated.

© 2007 Optical Society of America

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