Abstract
We present numerical results on the propagation of femtosecond pulses in air including multiphoton ionization, group-velocity dispersion, space–time focusing, self-steepening, Raman response, and higher-order χ (5) defocusing. It is shown that the self-steepening terms cause strong blue shifting of the spectrum generating a white-light continuum. Our results are in good qualitative agreement with experimental observations.
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