Abstract
Through use of coherence-modulated optical third harmonic generation, we simultaneously observe and distinguish coherent phonon oscillations from the bulk and interface of Bi3Ge4O12, which lacks inversion symmetry. We report the first observation of a coherent second hyper-Raman signal in bulk, along with phonon-induced Fresnel boundary modulation at the interface, both affecting the signal amplitude of the far-field third harmonic.
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