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Proceedings Paper

Self-induced electro-optic modulator: a new approach for homodyne detection of ultrasonic surface displacement
Author(s): Alexei A. Kamshilin; Kimmo Paivasaari; Nadezhda Nazhestkina
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Paper 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.

Paper Details

Date Published: 8 March 2001
PDF: 10 pages
Proc. SPIE 4318, Smart Optical Inorganic Structures and Devices, (8 March 2001); doi: 10.1117/12.417619
Show Author Affiliations
Alexei A. Kamshilin, Univ. of Joensuu (Finland)
Kimmo Paivasaari, Univ. of Joensuu (Finland)
Nadezhda Nazhestkina, Univ. of Joensuu (Finland)


Published in SPIE Proceedings Vol. 4318:
Smart Optical Inorganic Structures and Devices
Steponas P. Asmontas; Jonas Gradauskas, Editor(s)

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