Abstract
New interferometric technique based on the polarization of self-modulation (PSM) effect in photoconductive electrooptic crystals for the linear detection of small out-of-plane vibrations of a rough surface caused by ultrasound is described. The technique is more advantageous than the widely used photorefractive two-wave mixing technique. Basing on the vectorial theory of light diffraction in photorefractive crystals of cubic symmetry, the procedure of the PSM-interferometer optimization is proposed. The highest sensitivity of a PSM interferometer with fast semiconductor crystals is achieved in the transversal configuration when both the external electric field and grating vector are parallel to the axis. The sensitivity of the adaptive PSM-interferometer is only two times smaller than the sensitivity of the classical homodyne interferometer.
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