Abstract
A deformation of a short intensive laser pulse temporal profile by opticalfield ionization (OFI) processes is under consideration. In one-dimensionalanalysis at a comparatively long distance of the pulse propagation thedeformation is ensured by optical field absorption in addition to thedispersion. Three-dimensional effects lead to a modulation of the temporalprofile at a laser pulse penetration depth less than the Rayleigh length. Themodulation originates from interaction between the pulse and the inhomogeneousdynamic plasma channel created by OFI during the laser pulse propagation. Acriterion of the laser pulse `smooth' penetration into a gas undergoingionization at a distance about Rayleigh length is offered.
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