title: Conical emission, pulse splitting, and X-wave parametric amplification in nonlinear dynamics of ultrashort light pulses.
abstract: The precise observation of the angle-frequency spectrum of light filaments in water reveals a scenario incompatible with current models of conical emission (CE). Its description in terms of linear X-wave modes leads us to understand filamentation dynamics requiring a phase- and group-matched, Kerr-driven four-wave-mixing process that involves two highly localized pumps and two X waves. CE and temporal splitting arise naturally as two manifestations of this process.
authors.affiliation: CNR-INFM, Department of Physics and Mathematics, University of Insubria, Como, Italy. daniele.faccio@unisubria.it
authors.forename: Daniele
authors.initials: D
authors.lastname: Faccio
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Porras
authors.forename: Audrius
authors.initials: A
authors.lastname: Dubietis
authors.forename: Francesca
authors.initials: F
authors.lastname: Bragheri
authors.forename: Arnaud
authors.initials: A
authors.lastname: Couairon
authors.forename: Paolo
authors.initials: P
authors.lastname: Di Trapani