A coupling phenomenon between static and dynamic mode conversion in proton-exchanged (PE) LiNbO3 waveguides, called the resonant acousto-optic coupling, is reported for the first time. The principle underlying this phenomenon and its potential applications remain to be further investigated. Here we present a possible explanation of this phenomenon and apply it to the accurate measurement of the modal refractive indices in PE LiNbO3 waveguides. [References: 8]
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