Harmonic generation in a two dimensional nonlinear quasicrystal
  Second harmonic generation in a two dimensional nonlinear quasi-crystal is demonstrated for the first time. 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. 
Neil Broderick, Anna Peacock, Katia Gallo, Ruth Lewen and Radu   Bratfalean