title: Zero focusing via competing nonlinearities in beta-barium-borate crystals.
abstract: We investigate nonlinear focusing behavior of light beams propagating in beta-barium-borate crystals under mismatched second-harmonic generation. We clearly identify experimentally multiple self-focusing and defocusing regions against the orientation angle and the condition where competing quadratic and cubic nonlinearities perfectly compensate each other (zero-focusing point).
authors.forename: K
authors.initials: K
authors.lastname: Krupa
authors.forename: F
authors.initials: F
authors.lastname: Baronio
authors.forename: M
authors.initials: M
authors.lastname: Conforti
authors.forename: S
authors.initials: S
authors.lastname: Trillo
authors.forename: A
authors.initials: A
authors.lastname: Tonello
authors.forename: V
authors.initials: V
authors.lastname: Couderc