Abstract
A Gaussian laser beam with step function temporal profile, propagating through a plasma exerts radial ponderomotive force on the electrons and creates a plasma channel. The channel evolves on a time scale ∼r0/cs, where r0 is the beam spot size and cs is the sound speed, accompanied by time-dependent self focusing of the laser. In the case of an amplitude modulated laser, strong self distortion occurs when modulation frequency Ω<r0/cs. For Ω>r0/cs, self focusing occurs at a higher laser power and the beam width parameter has a small time-dependent ripple.
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