Analysis reveals phase-matching conditions improve second harmonic generation in micro-resonators, suggesting new optical applications.
We investigate second-order nonlinear processes in a system of two coupled identical optical micro-resonators. The double resonance and phase-matching conditions are simultaneously obtained thanks to the frequency splitting induced by the resonator coupling. The analysis made in the framework of the coupled mode theory is applied to the second harmonic generation process in two whispering gallery mode microdisks made in III-V materials.
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Dumeige et al. (2025) studied this question.
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