title: Stable three-dimensional optical solitons supported by competing quadratic and self-focusing cubic nonlinearities.
abstract: We show that the quadratic (chi(2)) interaction of fundamental and second harmonics in a bulk dispersive medium, combined with self-focusing cubic (chi(3)) nonlinearity, give rise to stable three-dimensional spatiotemporal solitons (STSs), despite the possibility of the supercritical collapse, induced by the chi(3) nonlinearity. At exact phase matching (beta = 0) , the STSs are stable for energies from zero up to a certain maximum value, while for beta not equal 0 the solitons are stable in energy intervals between finite limits.
authors.affiliation: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.
authors.forename: D
authors.initials: D
authors.lastname: Mihalache
authors.forename: D
authors.initials: D
authors.lastname: Mazilu
authors.forename: B A
authors.initials: BA
authors.lastname: Malomed
authors.forename: F
authors.initials: F
authors.lastname: Lederer
authors.forename: L-C
authors.initials: LC
authors.lastname: Crasovan
authors.forename: Y V
authors.initials: YV
authors.lastname: Kartashov
authors.forename: L
authors.initials: L
authors.lastname: Torner