title: Harmonic generation in a two-dimensional nonlinear quasi-crystal.
abstract: Second-harmonic generation in a two-dimensional nonlinear quasi-crystal is demonstrated for the first time to our knowledge. Temperature and wavelength tuning of the crystal reveal the uniformity of the pattern while angle tuning reveals the dense nature of the crystal's Fourier spectrum. These results compare well with theoretical predictions showing the excellent uniformity of the crystal and suggest that more-complicated nonlinear holograms should be possible.
authors.affiliation: Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK.
authors.forename: Radu T
authors.initials: RT
authors.lastname: Bratfalean
authors.forename: Anna C
authors.initials: AC
authors.lastname: Peacock
authors.forename: Neil G R
authors.initials: NG
authors.lastname: Broderick
authors.forename: Katia
authors.initials: K
authors.lastname: Gallo
authors.forename: Ruth
authors.initials: R
authors.lastname: Lewen