title: Measurement of the nonlinear phase shift induced by cascaded interactions in a periodically poled lithium niobate waveguide.
abstract: We report on the measurement of nonlinear phase shift phiNL induced by a strong pump at wavelength lamda p on a weak signal at lamda s through a cascade of two second-order interactions in a periodically poled lithium-niobate waveguide. The experiment is performed by use of an interferometric scheme especially designed to be insensitive to slow mechanical and thermal drift effects. The observed behavior of phiNL as a function of pump power and of wavelength difference lamda p - lamda s, is in good agreement with the theoretical predictions.
authors.affiliation: Dipartimento di Elettronica, Università di Pavia, 27100 Pavia, Italy. carlo.liberale@unipv.it
authors.forename: Carlo
authors.initials: C
authors.lastname: Liberale
authors.forename: Vittorio
authors.initials: V
authors.lastname: Degiorgio
authors.forename: Marco
authors.initials: M
authors.lastname: Marangoni
authors.forename: Gianluca
authors.initials: G
authors.lastname: Galzerano
authors.forename: Roberta
authors.initials: R
authors.lastname: Ramponi