title: Random quasi-phase-matched second-harmonic generation in periodically poled lithium tantalate.
abstract: We observe second harmonic generation via random quasi-phase-matching in a 2.0 mum periodically poled, 1-cm-long, z-cut lithium tantalate. Away from resonance, the harmonic output profiles exhibit a characteristic pattern stemming from a stochastic domain distribution and a quadratic growth with the fundamental excitation, as well as a broadband spectral response. The results are in good agreement with a simple model and numerical simulations in the undepleted regime, assuming an anisotropic spread of the random nonlinear component.
authors.affiliation: DIEET, University of Palermo, 90128 Palermo, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Stivala
authors.forename: A C
authors.initials: AC
authors.lastname: Busacca
authors.forename: A
authors.initials: A
authors.lastname: Pasquazi
authors.forename: R L
authors.initials: RL
authors.lastname: Oliveri
authors.forename: R
authors.initials: R
authors.lastname: Morandotti
authors.forename: G
authors.initials: G
authors.lastname: Assanto