Vol. 6, issue 01, article # 9

pdf Kandidov V. P., Kosareva O. G., Shlyonov S. A. Effect of the cubic nonlinearity and multiphoton ionization on spatiotemporal behavior of a subpicosecond laser pulse in air. // Atmospheric and oceanic optics. 1993. V. 6. No. 01. P. 79-85.
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Transformation of a laser pulse frequency spectrum and spatiotemporal distribution of radiation over the waist of a beam focused into air are numerically investigated. The effects of the Kerr nonlinearity and plasma nonlinearity due to multiphoton ionization of neutral molecules are considered. It is shown that both symmetric and blue asymmetric broadening of the transmitted pulse spectrum can be observed depending on the degree of beam focusing.