title: Planar second-harmonic generation with noncollinear pumps in disordered media.
abstract: We study experimentally the process of the second harmonic generation by two noncollinear beams in quadratic nonlinear crystals with a disordered structure of ferroelectric domains. We show that the second-harmonic radiation is emitted in the form of two cones as well as in a plane representing the cross-correlation of the two fundamental pulses. We demonstrate the implementation of this parametric process for characterisation of femtosecond pulses, enabling the estimation of pulse width, chirp, and front tilt. This is achieved through monitoring the evolution of the autocorrelation trace inside the nonlinear crystal.
authors.affiliation: Departament de Fisica i Enginyeria Nuclear, Escola Técnica Superior d'EnginyeriesIndustrial, y Aeronáutica de Terrassa, Universitat Politécnica de Catalunya, 08222 Terrassa, Barcelona, Spain.
authors.forename: Vito
authors.initials: V
authors.lastname: Roppo
authors.forename: David
authors.initials: D
authors.lastname: Dumay
authors.forename: Jose
authors.initials: J
authors.lastname: Trull
authors.forename: Crina
authors.initials: C
authors.lastname: Cojocaru
authors.forename: Solomon M
authors.initials: SM
authors.lastname: Saltiel
authors.forename: Kestutis
authors.initials: K
authors.lastname: Staliunas
authors.forename: Ramon
authors.initials: R
authors.lastname: Vilaseca
authors.forename: Dragomir N
authors.initials: DN
authors.lastname: Neshev
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Krolikowski
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar
mesh_terms: D003198:Computer Simulation; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation