title: Third-harmonic generation via nonlinear Raman-Nath diffraction in nonlinear photonic crystal.
abstract: We report on the observation of multiple third-harmonic conical waves generated in an annular periodically poled nonlinear photonic crystal. We show that the conical beams are formed as a result of the cascading effect involving two parametric processes that satisfy either the transverse and/or longitudinal phase-patching conditions. This is the first experimental observation of third-harmonic generation based on nonlinear Raman-Nath diffraction.
authors.affiliation: Laser Physics Center, Research School of Physics and Engineering, Australian National University, ACT 0200, Australia. ysh111@physics.anu.edu.au
authors.forename: Yan
authors.initials: Y
authors.lastname: Sheng
authors.forename: Wenjie
authors.initials: W
authors.lastname: Wang
authors.forename: Roy
authors.initials: R
authors.lastname: Shiloh
authors.forename: Vito
authors.initials: V
authors.lastname: Roppo
authors.forename: Ady
authors.initials: A
authors.lastname: Arie
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Krolikowski