Proceedings PaperCoherent and incoherent processes of acousto-optic interaction on the rough surface
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Condition of the surface where acousto-optic interaction occurs defines the nature of the process in many respects. Specifically, the light scattering on the rough changing in time surface loses its coherence, that leads to efficiency of known interference and holographic methods of small acoustic perturbation registration decreases. Results of theoretical and experimental investigations of acoustic modulation, both space and frequency spectra of the light scattered by essentially incoherent means on the rough chaotic moving surface, are presented. It is shown that the magnitude of sound modulation of the scattered light energetic pattern is defined not only by the interface condition, but also by the light characteristics. Further, the possibility of coherent combination frequency Bragg scattering is considered. Such processes occur as a result of acousto-optic interaction on a statistically rough surface with the typical sizes of roughness much larger with respect to the wavelength of both light and sound. In case of commensurable wavelengths of optic and acoustic fields, we arrange the phenomenon with similar phase conjunction of optic radiation on sound stimulated chaotic moving rough surfaces.