title: Multiorder nonlinear diffraction in frequency doubling processes.
abstract: We analyze experimentally light scattering from chi(2) nonlinear gratings and observe two types of second-harmonic frequency-scattering processes. The first process is identified as Raman-Nath type nonlinear diffraction that is explained by applying only transverse phase-matching conditions. The angular position of this type of diffraction is defined by the ratio of the second-harmonic wavelength and the grating period. In contrast, the second type of nonlinear scattering process is explained by the longitudinal phase matching only, being insensitive to the nonlinear grating period.
authors.affiliation: Nonlinear Physics Centre, CUDOS, Research School of Physics and Engineering, The Australian National University, Canberra ACT, Australia. saltiel@phys.uni-sofia.bg
authors.forename: Solomon M
authors.initials: SM
authors.lastname: Saltiel
authors.forename: Dragomir N
authors.initials: DN
authors.lastname: Neshev
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Krolikowski
authors.forename: Ady
authors.initials: A
authors.lastname: Arie
authors.forename: Ole
authors.initials: O
authors.lastname: Bang
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar