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Two types of novel wavelength conversion device structure are proposed: a transverse quasi-phase matched waveguide and a monolithic microcavity. The former includes polarity-inverted stacked multilayer of AlN or GaN artificially fabricated by wafer bonding or epitaxial polarity inversion techniques. And the latter is a microcavity composed of a GaN domain with one coherence length sandwiched with two DBRs. The report on the successful demonstration of second harmonic generation and the discussion on the exploration for the novel nonlinear optical materials, even in the absence of birefringence and ferroelectricity, will be given in the presentation.
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