Laser Pulses Shortening at Transient Backward SRS and Forward Scattering Suppression

Mathematical simulation of the transient SRS process is performed taking into account backward scattering and Stokes-anti-Stokes parametric coupling of the forward waves. It is shown that the parametric coupling has a slight influence on the suppression of forward scattering. A main contribution to the SRS asymmetry is made by pumping exhaustion by the backward Stokes waves. The dynamics of scattering radiation formation is studied and the conditions for obtaining high-contrast pulses at SRS compression are formulated.