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Phys Rev Lett. 2005 Nov 4;95(19):193002. Epub 2005 Nov 3.

Classical effects of laser pulse duration on strong-field double ionization.

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Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.


We use classical electron ensembles and the aligned-electron approximation to examine the effect of laser pulse duration on the dynamics of strong-field double ionization. We cover the range of intensities 10(14)-10(16) W/cm2 for the laser wavelength 780 nm. The classical scenario suggests that the highest rate of recollision occurs early in the pulse and promotes double-ionization production in few-cycle pulses. In addition, the purely classical ensemble calculation predicts an exponentially decreasing recollision rate with each subsequent half cycle. We confirm the exponential behavior by trajectory back analysis.

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