Abstract
An experimental study of the second harmonic generation conversion efficiency of Fresnel phase matching as a function of a gallium arsenide sample length is presented. It shows a strong deviation from the classical quadratic law, explaining the low conversion yields related in the literature. In order to explain these experimental results, a highly multimodal nonlinear waveguide model is developed which shows a good agreement with the experimental results. It highlights the detrimental role of nonlinear reflection.
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