We demonstrate a high-power single-mode cladding-pumped Raman fiber laser. The Raman fiber laser consists of a $1.2\mathrm{km}$ long germanium-doped double-clad fiber in a linear cavity, which is spliced to a single-mode fiber. The laser is end pumped by a multimode erbium–ytterbium-doped fiber, which is coupled to the inner cladding of the Raman fiber. The embedded core was designed to be single mode at the Raman Stokes wavelength, and up to $10\mathrm{W}$ of power was obtained at $1660\mathrm{nm}$ from the single-mode fiber end. The laser has a slope efficiency of 67% and a threshold of $6.5\mathrm{W}$ .

© 2006 Optical Society of America

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