Holographic-disk-based optical neural network

Abstract

Holographic photothermoplastic disks with two-dimensional Fourier hologram registration obtained by infrared laser heating of the recording layer is described. These disks have high information recording density (~10(5) bits/mm(2)), high quality of the registered Fourier holograms (eta = 5-7%, contrast ratio 70:1), the possibility of information rerecording, and invariance to shift in thin phase holograms. A holographic-disk-based scheme of an optical neural network with outer-product implementation is suggested. The main advantages of this approach are discussed, and the results of such a neural network modeling are described.

Three-dimensional disk-based optical correlator

“…S'( XFYdt)j j g (x,y)f [x + 0(t),y -Yd' th dy. (3) The intensity at the detector is I(JiXF,y,t) =S' S'*, and therefore the detected signal is the square of the correlation function. With a thick medium, multiple holograms can be recorded at a single spot on the disk, using angle multiplexing.…”

<title>Multichannel disk-based optical correlator</title>

“…(3) Since intensity at detector is 1(0, Yd, t) = SS, the intensity detected is equal to the square of the correlation function. With a thick medium, multiple holograms can be recorded at a single spot on the disk using angle multiplexing.…”

Conjugate Image Plane Correlator with Holographic Disk Memory

“…Since each hologram consists of 16xl04 connections, the average processing rate is about Vp=2xl6xl04/1,7xl0-4=18.8xl08connections/s (12). For experiments, we have used the motor of a CD player and DuPont photopolymer pasted on the surface of a CD substrate without tracks.…”