Signal Correlation with Phase-Conjugate Holographic Reconstruction Using a BaTiO[sub]3[/sub] Crystal

Philip S. Brody

doi:10.1117/12.960373

16 June 1986 Signal Correlation with Phase-Conjugate Holographic Reconstruction Using a BaTiO₃ Crystal

Philip S. Brody

Proceedings Volume 0613, Nonlinear Optics and Applications; (1986) https://doi.org/10.1117/12.960373
Event: O-E/LASE'86 Symposium, 1986, Los Angeles, CA, United States

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.

Citation Download Citation

Philip S. Brody "Signal Correlation with Phase-Conjugate Holographic Reconstruction Using a BaTiO₃ Crystal", Proc. SPIE 0613, Nonlinear Optics and Applications, (16 June 1986); https://doi.org/10.1117/12.960373

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