Wavelength conversion via quadratic optical nonlinearity in AlGaAs waveguiding devices will be presented. Devices reported in this article include periodically inverted quasi-phase matching (QPM) devices and thin- rectangular high-index-contrast birefringence phase matching devices. Special emphasis will be placed on GaAs/AlGaAs QPM waveguides fabricated based on epitaxial growth technique (sublattice reversal epitaxy) we have developed for growing spatially inverted semiconductors. We have succeeded in demonstrating QPM second-harmonic generation and difference-frequency generation with reasonably high efficiencies.
Channel waveguides were fabricated using a nonlinear optical organic material (-)2-(a-methylbenzylamino)-
5-nitropyridine (MBANP) with the objective of application to the frequency doubling of laser
diode light. Blue light was obtained by second-harmonic generation in the form of Cerenkov radiation
using a laser diode source oscillating at A = 870 nm.
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