Abstract
We present an analysis of a high index core symmetric Bragg reflection waveguide (BRW) design based on GaN-AlxGa1-xN system for efficient phase-matched second-harmonic generation (SHG). Using phase-matched interaction between a zeroth-order total internal reflection guided mode at fundamental and a BRW mode at second harmonic, an enhancement in efficiency is brought about by suitably inverting the domains in the core of BRW. The design allows us to obtain a suitable poling thickness using a simple relation and the thickness calculated for poling in GaN core is feasible to be realized experimentally. The tolerance of the SHG process towards wavelength fluctuations is also analyzed.
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