  Multi-frequency Raman generation is a promising method of producing
ultrashort laser pulses with high intensities and visible wavelength
frequencies. In experimental realizations of multi-frequency Raman generation
the Raman order peaks display several behaviours that are not explained by the
current theory. We derive an analytic and perturbative expression for the
spectrum radiated by a Raman medium excited by multiple Gaussian laser pulses
and show that it qualitatively agrees with experimental observations.
