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GaAs/AlGaAs waveguides with periodical spatial-inversion structures are expected to function as efficient quasi-phase-matching wavelength conversion devices. To further increase conversion efficiencies, introduction of current injection is promising because optical gain due to spontaneous interband emission can compensate propagation losses and thus leads to higher efficiencies. We have successfully...
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.
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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