title: Observation of self-focusing of light mediated by cubic nonlinearities in potassium titanyl phosphate.
abstract: We report our observations of the transient self-narrowing of light beams mediated by dominant Kerr nonlinearities and two-photon absorption in a bulk potassium titanyl phosphate crystal near conditions for second-harmonic generation. Drastic differences between upconversion and downconversion processes are highlighted.
authors.forename: Silvia
authors.initials: S
authors.lastname: Carrasco
authors.forename: Hongki
authors.initials: H
authors.lastname: Kim
authors.forename: George
authors.initials: G
authors.lastname: Stegeman
authors.forename: Pablo
authors.initials: P
authors.lastname: Loza-Alvarez
authors.forename: Lluis
authors.initials: L
authors.lastname: Torner