We report a laser-diode-pumped 1407-nm Raman fiber laser with an output power of 1 W. In this three-cascaded cw Raman laser, based on a single active phosphorus-doped silica fiber, for the first time to the authors' knowledge successive generation of Stokes components of essentially different frequency shifts (1330 and 490cm<sup>-1</sup>) has been realized. These Stokes components are associated with both constituents (P<sub>2</sub>O<sub>5</sub> and SiO<sub>2</sub>) of the fiber core glass.
© 2000 Optical Society of America
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3510) Lasers and laser optics : Lasers, fiber
(140.3550) Lasers and laser optics : Lasers, Raman
(190.4370) Nonlinear optics : Nonlinear optics, fibers
E. M. Dianov, I. A. Bufetov, M. M. Bubnov, M. V. Grekov, S. A. Vasiliev, and O. I. Medvedkov, "Three-cascaded 1407-nm Raman laser based on phosphorus-doped silica fiber," Opt. Lett. 25, 402-404 (2000)