A theory is presented to describe the dynamics of multiline parametric
SRS (PSRS) in a highly transient regime. The PSRS conversion of the b
iharmonical pump at laser and Ist Stokes frequencies may generate Rama
n components filling the bandwidth up to Delta nu/nu = 1.4 (two octave
s on level of 0.1 to peak) with a bandwidth buildup time much less tha
n time T-2 of the Raman medium at modest experimental conditions.