Second-harmonic generation at l=1.6 micro m in AlGaAs/Al2O3 waveguides using birefringence phase matching

We demonstrate phase-matched second-harmonic generation from a λ=1.6 μm pump in a GaAs-based waveguide. Phase matching is obtained by using the form birefringence in an AlGaAs/Al2O3 multilayer obtained by selective wet oxidation.