title: Generation of second-harmonic conical waves via nonlinear bragg diffraction.
abstract: We report on the observation of second-harmonic conical waves generated in a novel geometry of the transverse excitation of an annular periodically poled nonlinear photonic structure by a fundamental Gaussian beam. We show that the conical beams are formed as a result of the higher-order nonlinear Bragg diffraction involving two parametric processes in which an ordinary fundamental wave is converted simultaneously into ordinary and extraordinary polarized second harmonics.
authors: Nonlinear Physics Center and Laser Physics Center, Center for Ultra-high Bandwidth Devices for Optical Systems, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia.
authors: Solomon M
authors: SM
authors: Saltiel
authors: Dragomir N
authors: DN
authors: Neshev
authors: Robert
authors: R
authors: Fischer
authors: Wieslaw
authors: W
authors: Krolikowski
authors: Ady
authors: A
authors: Arie
authors: Yuri S
authors: YS
authors: Kivshar