Ms. Dzhidzhoev et al., NUMERICAL-SIMULATION OF STIMULATED-RAMAN-SCATTERING CONVERSION OF FEMTOSECOND UV PULSES, Quantum electronics, 27(3), 1997, pp. 249-253
A numerical simulation is reported of transient, forward stimulated Ra
man scattering (SRS) of femtosecond pulses in dispersive molecular gas
es. The one-dimensional two-wave approximation is used and the self-ph
ase modulation as well as the cross-phase modulation of the pulses are
taken into account. The kinetics of formation of a Stokes pulse and t
he transformation of the spectrum and temporal profile in the course o
f amplification to saturation are tackled for the first time. It is sh
own that a fundamental role is played by the influence of the differen
ce between the group velocities, which governs the rate of passage of
a Stokes pulse along the pump pulse, on the SRS conversion parameters.
Depending on this velocity difference, which is a characteristic of t
he active medium and proportional to its pressure, the SRS falls into
three regimes: (1) a Stokes pulse repeats the profile of a pump pulse;
(2) pulse compression with optimal gain and strong peaking of the lea
ding edge; (3) multispiking oscillation.