Conventionally, large-mode-area (LMA) fiber lasers use free-space polarizing components to achieve linear polarization output. External components, however, significantly limit laser robustness and power scalability. We demonstrate, to the best of our knowledge, the first high-power all-fiber cavity single-polarization single-transverse-mode LMA fiber laser, without the use of free-space polarizing components. This has been achieved by using tightly coiled high-birefringence $20\mu \mathrm{m}$ core LMA fiber. The lasing spectrum at $1085\mathrm{nm}$ has been stabilized by a fiber grating, spliced at one end of a LMA fiber. Up to $405\mathrm{W}$ of single-polarization output with a polarization extinction of $>19\mathrm{dB}$ with a narrow spectrum ( $1.9\mathrm{nm}$ FWHM) and in a single-transverse mode $(M^2<1.1)$ has been demonstrated. The simplicity of a monolithic-cavity approach is highly beneficial for a number of applications, including the use of a fiber laser for nonlinear wavelength conversion and for coherent and spectral beam combining.

© 2006 Optical Society of America

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