Abstract
The mechanism and influence of quadratic electro-optic effect in GaN-based materials is investigated. It is found that the peaks appearing in the measured electro-optic signal strongly depend on the modulation frequency of external electric field, which is attributed to the vibration frequency resonance effect. The intrinsic vibration frequency of the investigated samples is estimated to be around 21.95 kHz and is assigned to be the base frequency of the resonance.
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