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Opt Express. 2008 Feb 4;16(3):1565-70.

Ultrashort laser pulse filamentation from spontaneous X-Wave formation in air.

Author information

  • 1CNISM and Department of Physics and Mathematics, Universit√† dell'Insubria, Via Valleggio 11, IT-22100 Como, Italy. daniele.faccio@uninsubria.it


The description of ultrashort laser pulse filamentation in condensed media as a spontaneous formation of X waves is shown to apply also to filaments generated in air. Within this framework, a simple explanation is brought for several features of the filament such as the subdiffractive propagation and the energy flux from the weakly localized tails of the X-waves to the intense core.

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