Second-harmonic generation in optical superlattices at the oblique incidence of light

We investigate second-harmonic generation (SHG) when light obliquely launches upon optical superlattices, which is optimally devised with the use of a simulated annealing method and can achieve simultaneously a multiple wavelength SHG with a high conversion efficiency. We find that the conversion efficiency at the oblique incidence of light can be increased significantly, compared to that at the normal incidence of light. (c) 2006 American Institute of Physics.