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We propose novel multi-phase-matched process that starts with generation of apair of symmetric second-harmonic waves. Each of them interacts again with thefundamental wave to produce two constructively interfering third harmonic wavescollinear to the fundamental input wave.Comment: Summary of presentation at the IQEC/LAT-2002 conferenc

Efficient collinear third-harmonic generation in a single two-dimensional nonlinear photonic crystal