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We have achieved the lowest propagation loss of 1.3 dB/cm in a quasi-phase-matched GaAs/AlGaAs waveguide by optimizing MBE growth temperature. An expected normalized conversion efficiency of the waveguide will exceed that of a PPLN waveguide.
We have investigated a quasi-phase-matching AlGaAs waveguide using cathodoluminescence spectroscopy and atomic force microscopy. We found that the anisotropic diffusion of Al/Ga atoms causes Al-composition modulation as well as interface corrugations.
We propose a novel wavelength conversion device based on hybrid modal phase matching and quasi phase matching in combined straight and bent waveguides with the laterally inverted core structure. Numerical simulations revealed that conversion efficiency as high as 27500 %/W is attainable for 1.55-/im SHG in a 32-mm-long AlGaAs/SiO2 rib waveguide that can be folded up into a 1.6-mm × 84 /m domain.
Infrared wavelength conversion via quadratic optical nonlinearities in AlGaAs waveguiding devices will be presented. We demonstrate quasi phase matching in periodically-inverted AlGaAs waveguides and birefringent phase matching in high-index-contrast AlGaAs/Alox waveguides.
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