title: X waves generated at the second harmonic.
abstract: The process of optical frequency doubling in the undepleted regime can lead to the generation of an X-wave envelope with group velocity locked to the pump beam. Its parameters and its angular spectrum are directly related to the zeroth- and first-order dispersive features of the nonlinear process. This constitutes a novel mechanism for spatiotemporal localization of light.
authors.affiliation: National Institute for the Physics of Matter, Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy. c.conti@ele.uniroma3.it
authors.forename: Claudio
authors.initials: C
authors.lastname: Conti
authors.forename: Stefano
authors.initials: S
authors.lastname: Trillo