Abstract
A novel approach to achieving robust single-spatial-mode operation of cladding-pumped fiber lasers with multimode cores is reported. The approach is based on the use of a fiber geometry in which the core has a helical trajectory within the inner cladding to suppress laser oscillation on higher-order modes. In a preliminary proof-of-principle study, efficient single-mode operation of a cladding-pumped ytterbium-doped helical-core fiber laser with a diameter core and a numerical aperture of 0.087 has been demonstrated. The laser yielded of output at in a beam with for launched pump power from a diode stack at . The slope efficiency at pump powers well above threshold was , which compares favorably with the slope efficiencies achievable with conventional straight-core Yb-doped double-clad fiber lasers.
© 2006 Optical Society of America
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