We describe a novel type of second-order cascading by which the signal that is cross polarized to the pump can be split with an efficiency of more than 100%.

Abstract: We describe a no,cl type of second-order cascading by which the signal that is cross polarized to the pump can be split with an efficiency of more than 100%. The process requires the simultaneous phase matching of two second-order parametric interactions, whcih can easily be achieved with recently fabricated two-dimensional nonlinear photonic crystals.

Keywords: nonlinear photonic crystal; lithium-niobate; wave-guides; generation

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