title: Spontaneously generated X-shaped light bullets.
abstract: We observe the formation of an intense optical wave packet fully localized in all dimensions, i.e., both longitudinally (in time) and in the transverse plane, with an extension of a few tens of fsec and microns, respectively. Our measurements show that the self-trapped wave is an X-shaped light bullet spontaneously generated from a standard laser wave packet via the nonlinear material response (i.e., second-harmonic generation), which extend the soliton concept to a new realm, where the main hump coexists with conical tails which reflect the symmetry of linear dispersion relationship.
authors.affiliation: Istituto Nazionale di Fisica della Materia (INFM) and Department of Chemical, Physical and Mathematical Sciences, University of Insubria, Via Valleggio 11, 22100 Como, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Di Trapani
authors.forename: G
authors.initials: G
authors.lastname: Valiulis
authors.forename: A
authors.initials: A
authors.lastname: Piskarskas
authors.forename: O
authors.initials: O
authors.lastname: Jedrkiewicz
authors.forename: J
authors.initials: J
authors.lastname: Trull
authors.forename: C
authors.initials: C
authors.lastname: Conti
authors.forename: S
authors.initials: S
authors.lastname: Trillo