The output characteristics of the conventional one-stage Raman fiber laser are described theoretically by using the optical wave turbulence formalism. Simple analytical expressions describing RFL output power and its spectral shape are presented as well as square-root law for the output spectrum broadening law has been discovered. The indications of the turbulent-like spectral broadening in other types of CW fiber lasers and propagation phenomena in fibers are also discussed.
We present an analytical model based on a wave kinetic equations that describes RFL output spectrum. We
have shown both theoretically and experimentally that the four-wave mixing (FWM) is the main broadening
mechanism. Near the Stokes wave generation threshold the Stokes wave spectrum profile is defined by the nondegenerate
FWM between Stokes wave and pump wave. High above the generation threshold, the quasi-degenerate
FWM between different Stokes wave longitudinal modes plays the main role. The shape and power dependence
of the intracavity Stokes wave spectrum is in a excellent quantitative agreement with model predictions.
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