Theory of Stokes and anti-Stokes generation by Raman frequency conversion in the transient limit

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Abstract
Analytic and numerical solutions are obtained for the equations describing the propagation of several pulses of different frequencies through a Raman medium. The transient case is treated, and the analysis includes Stokes, pump, and anti-Stokes frequency components. The effect of phase mismatch Δk between these waves is investigated. An analytic solution is found that describes the phenomenon of transient Stokes–anti-Stokes gain suppression in the limit Δk=0. For nonzero values of Δk, the behavior of the transient gain coefficient is found to follow a scaling rule that is the analog of a similar result known from the steady-state limit. Calculations are performed to identify conditions that enhance conversion to anti-Stokes radiation. It is found that there is an optimum strength of the Stokes seed, and that proper phase matching of the initial waves is essential.