23 February 2009 Calculation of quasi phasematching in optical parametric GaAs/AlGaAs waveguides
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Abstract
Quasi phasematched domain periods for bulk and waveguide GaAs nonlinear frequency conversion were calculated. Waveguide beam confinement resulted in a decrease in effective refractive index and the magnitude of this index change was found to increase supralinearly with wavelength. Domain periodicity required for a 2.056-μm pumped, 10x10 μm2 GaAs core, Al0.5Ga0.5As cladding waveguide OPO at degeneracy decreased from 60.4 μm for bulk GaAs to 57.9 μm for a rib waveguide and 49.8 μm for a buried waveguide in a GaAs OPO. Careful accounting for waveguide effects is necessary to fabricate a periodic waveguide structure with the desired function.
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Kenneth L. Schepler, Justin B. Spring, "Calculation of quasi phasematching in optical parametric GaAs/AlGaAs waveguides", Proc. SPIE 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII, 719708 (23 February 2009); doi: 10.1117/12.808035; https://doi.org/10.1117/12.808035
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