<title>New variants of use of phase-conjugate feedback for content-addressable data retrieval by thin holograms</title>

Abstract

New variants of use of phase-conjugate feedback for content-addressable (associative) data retrieval by thin lensless Fourier holograms are considered: referenceless registration of interference pattern of mutually conjugated object waves, compensation of phase of initially diffracted by hologram wave and forming of second orders due to repeated, after phase conjugation, diffraction upon a hologram.

Self-conjugation heteroassociative memories using thin static nonlinearly recorded holograms

“…To say, in linear approximation, when for all l > 1, read out of a hologram with amplitude transmittance (2c) does not lead to recon struction of the field G. But the utterly interesting result that is essentially related to the problem of optical memory is revealed, when one considers the quadratic components of the amplitude transmittances described by Eqs. (2) (so called quadric hologram approximation [26], see also [13][14][15][16][17]). Namely, from Eq.…”

“…The first step on this way has been made in paper [12]. (See also papers [13][14][15][16][17][18].) Here we derive new important solu tions of the problem of interest proceeding from this approach.…”