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Broadening of the phase-matching bandwidth in quasi-phase-matched second-harmonic generation using GaN-based Bragg reflection waveguide

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Abstract

We present an analysis of a high index core symmetric Bragg reflection waveguide (BRW) design based on a GaNAlxGa1xN system for efficient quasi-phase-matched second-harmonic generation for broadband applications. By choosing the fundamental frequency to be a BRW mode and suitably tailoring the overall dispersion characteristics, the strong dispersion of the second-harmonic mode is partially canceled, leading to phase matching between the fundamental and second-harmonic over a broad range of wavelengths. The crucial interplay between the dispersive behavior of the fundamental and second-harmonic wave manifests as a broad acceptance bandwidth of 33nm accompanied with appreciable conversion efficiency (22.8%W) for a 10mm long waveguide. The impact of tailoring the dispersion characteristics on the conversion efficiency is also discussed.

© 2007 Optical Society of America

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