The processes affecting the spectrum of the pulse is studied. Amongthese are self-phase modulation, nonlinear self-focusing, plasma generation, andgroup velocity dispersion. The combination of these factors leads to an asymmetric spectrum. If group velocity dispersion cannot arrest nonlinear self-focusing, selfphase modulation, coupled with nonlinear self-focusing, gives rise to a red shifted spectrum. In case plasma is generated, large blue shifted components are observed. The maximum blue shift is determined by both the maximum value of the electron density, and the distance over which the plasma extends. Interaction Picture Method in combination with the Conserved Quantity Error method for the step-size determination is adapted for the calculations.
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