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Proceedings Paper

Signal Correlation with Phase-Conjugate Holographic Reconstruction Using a BaTiO[sub]3[/sub] Crystal
Author(s): Philip S. Brody
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Paper Abstract

An experimental demonstration is presented of a new optically implemented analog method which generates the correlation function of a reference rf signal and a continuous signal input. A reference signal input into an acousto-optic cell produces an index-of-refraction pattern. A coherent pulse input into the cell is modulated by the index pattern. This optical pulse, phase modulated by the index pattern, is directed into a BaTiO3 crystal and recorded there as a volume phase hologram. At this point a second input into the cell produces a second, moving, index-of-refraction pattern in the cell. A second optical input passing through the cell generates a phase-conjugate reconstruction of the original optical field, that of the pulse diffracted by the reference index pattern. The conjugate field propagates back through the cell, where it is diffracted by the moving pattern. The back-propagating cell output is collected by a spherical lens. There is a variation in intensity at the focus, as the moving index pattern shifts with respect to the stationary reconstruction. This variation, a function of the shift, is the correlation function of the two signals.

Paper Details

Date Published: 16 June 1986
PDF: 4 pages
Proc. SPIE 0613, Nonlinear Optics and Applications, (16 June 1986); doi: 10.1117/12.960373
Show Author Affiliations
Philip S. Brody, Department of the Army (United States)

Published in SPIE Proceedings Vol. 0613:
Nonlinear Optics and Applications
Pochi Yeh, Editor(s)

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