Abstract

A highly elongated double-clad ribbon fiber that comprises a pure-silica inner cladding with transverse dimensions of $\sim 1.4\mathrm{mm}$ by $0.23\mathrm{mm}$ with a linear array of ten ytterbium-doped cores has been fabricated and operated in a simple laser configuration pumped by two diode stacks. The fiber laser yielded $320\mathrm{W}$ of output power at a center wavelength of $1045\mathrm{nm}$ in a combined beam with beam propagation factors of $\sim 2$ (perpendicular to the array) and $\sim 150$ (parallel to the array) for $576\mathrm{W}$ of launched pump power. The slope efficiency with respect to absorbed pump power was 62%. The prospects for further power scaling and improved beam quality and efficiency are discussed.

© 2005 Optical Society of America

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