Analytical study of broadband second harmonic generation by total internal reflection-quasi phase matching using the concept of highly multimodal nonlinear guided wave approach in a tapered isotropic slab of zinc telluride crystal

This paper analytically describes the concept of highly multimodal non-linear guided wave approach instead of plane wave optics for explaining broadband second harmonic generation in the mid-infrared region in an isotropic tapered semiconductor slab for ppp-polarization. A computer aided simulation has been carried out to determine the possible efficiency of the second harmonic generation as they undergo total internal reflection quasi phase matching (TIR-QPM) inside the tapered isotropic semiconductor crystal slab made of Zinc Telluride (ZnTe), after considering the absorption, reflection losses and Goos-Hänchen shift within the crystal.