Spectral broadening in Raman fiber lasers.

  title={Spectral broadening in Raman fiber lasers.},
  author={S. A. Babin and Dmitry V. Churkin and A. E. Ismagulov and Sergey I. Kablukov and Evgenii V Podivilov},
  journal={Optics letters},
  volume={31 20},
We present an analytical theory based on wave kinetic equations that describes a Raman fiber laser (RFL) generation spectrum. It is shown both theoretically and experimentally that the quasi-degenerate four-wave mixing between different longitudinal modes is the main broadening mechanism in the one-stage RFL at high powers. The shape and power dependence of the intracavity Stokes wave spectrum are in excellent quantitative agreement with predictions of the theory. 
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