Few-cycle laser-pulse collapse in Kerr media: The role of group-velocity dispersion and X-wave formation

Daniele Faccio, Matteo Clerici, Alessandro Averchi, Antonio Lotti, Ottavia Jedrkiewicz, Audrius Dubietis, Gintaras Tamosauskas, Arnaud Couairon, Francesca Bragheri, Dimitris Papazoglou, Stelios Tzortzakis, Paolo Di Trapani

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We study ultrashort laser-pulse propagation and filamentation dynamics in dispersive Kerr media. We identify the regime for which the filamentation threshold (P-th) is considerably higher than the critical power (P-cr) for monochromatic beam collapse in pure Kerr media. In particular, we compare the threshold for the formation of filaments with that for the formation of X-waves. At powers P-cr < P < P-th, self-focusing is arrested by group-velocity dispersion, and no filaments or X-waves are formed. At P >= P-th, we observe X-wave formation and a weak filamentation regime. At P >> P-th, we observe both X-waves and fully formed filaments.

Original languageEnglish
Article number033826
Pages (from-to)-
Number of pages7
JournalPhysical Review A
Issue number3
Publication statusPublished - Sep 2008

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