Self-induced electro-optic modulator: a new approach for homodyne detection of ultrasonic surface displacement

Alexei A. Kamshilin; Kimmo Paivasaari; Nadezhda Nazhestkina

doi:10.1117/12.417619

8 March 2001 Self-induced electro-optic modulator: a new approach for homodyne detection of ultrasonic surface displacement

Alexei A. Kamshilin, Kimmo Paivasaari, Nadezhda Nazhestkina

Author Affiliations +

Proceedings Volume 4318, Smart Optical Inorganic Structures and Devices; (2001) https://doi.org/10.1117/12.417619
Event: Advanced Optical Materials and Devices, 2000, Vilnius, United States

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 <110> axis. The sensitivity of the adaptive PSM-interferometer is only two times smaller than the sensitivity of the classical homodyne interferometer.

Citation Download Citation

Alexei A. Kamshilin, Kimmo Paivasaari, and Nadezhda Nazhestkina "Self-induced electro-optic modulator: a new approach for homodyne detection of ultrasonic surface displacement", Proc. SPIE 4318, Smart Optical Inorganic Structures and Devices, (8 March 2001); https://doi.org/10.1117/12.417619

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