Abstract: We suggest a novel scheme for multistep cascaded parametric processes based on a periodically poled non-linear directional coupler and derive the conditions for simultaneous phase matching of the second-harmonic generation and sum-frequency mixing processes. We predict an efficient wavelength conversion by the cascaded third-harmonic generation from the third optical communication window (1.53-1.56 µm) to visible in a {{LiNbO}$_3$} poled waveguide coupler. (c) 2005 Optical Society of America.

Keywords: optical superlattice; 3rd-harmonic generation

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