The University of Alabama

Teledyne Industries, Inc.

Teledyne Brown Engineering, Inc.

H John Caulfield

Joseph Shamir

Qiang Huang

Valentin Morozov

Andrei Putilin

Charles F Hester

Jason M Kinser

A waveguide hologram illumination system is based on thin substrate waveguides bearing a hologram on the surface through which light is diffracted out. A light source is optically coupled to the waveguide such that light emitted from the source is caused to propagate along the waveguide, being diffracted out at intersections with the surface of the waveguide on which the hologram is formed. The selective emission through the hologram can be advantageously used to illuminate display holograms or spatial light modulators. Provisions are made for rendering the amount of light emitted through the hologram uniform along the length of the hologram.

Waveguide hologram illuminators

A multimode waveguide having a small thickness has light coupled to the side of the waveguide in order to provide a multimode operation of the waveguide for providing a continuous pattern of totally internally reflected light which is utilized to reconstruct holographic images from a holographic emulsion placed on a surface of the waveguide. This waveguide structure for reconstructuring a hologram has the capability of providing highly efficient hologram reconstruction while using ordinary light sources and is able to use beam diameters greater than the thickness of the waveguide.

Side illuminated multimode waveguide

Multimode waveguide holograms capable of using non-coherent light

An optical apparatus for simulating a highly interconnected neural network is disclosed as including a spatial light modulator (SLM), an inputting device, a laser, a detecting device, and a page-oriented holographic component. The inputting device applies input signals to the SLM. The holographic component optically interconnects N.sup.2 pixels defined on the spatial light modulator to N.sup.2 pixels defined on a detecting surface of the detecting device. The interconnections are made by N.sup.2 patterns of up to N.sup.2 interconnection weight encoded beams projected by N.sup.2 planar, or essentially two-dimensional, holograms arranged in a spatially localized array within the holographic component. The SLM modulates the encoded beams and directs them onto the detecting surface wherein a parameter of the beams is evaluated at each pixel thereof. The evaluated parameter is transformed according to a nonlinear threshold function to provide transformed signals which can be fed back to the SLM for further iterations.

Neural processor with holographic optical paths and nonlinear operating

A system to produce interconnections between a planar input array and a planar output array using a holographic planar array made by a single exposure or multiple exposures of a photosensitive medium incorporated therein at each of M.times.N positions in said holographic planar array to store the weighted interconnections to connect each input of the O.times.P input array to any one or any combination of outputs in the R.times.s output array in parallel with the strength of connection for each output being determined by the weighting factors as stored in said holographic planar array unadjusted or as adjusted by one or more modulating devices incorporated therein when the optically aligned system is illuminated from any one or any combination of V.times.W sources each of which produces a beam of electromagnetic radiation singular in time or any combination of such V.times.W sources in parallel with each such source producing a different wavelength or any combination of such V.times.W sources producing the same wavelength of electromagnetic radiation and any one or any combination of the positions of the O.times.P input array are connected to either an electrical signal source or to an optical signal source.

Holographic interconnect system

An optical apparatus for simulating a highly interconnected neural network is disclosed as including a spatial light modulator (SLM), an inputting device, a laser, a detecting device, and a page-oriented hologaphic component. The inputting device applies input signals to the SLM. The holographic component optically interconnects N.sup.2 pixels defined on the spatial light modulator to N.sup.2 pixels defined on a detecting surface of the detecting device. The interconnections are made by N.sup.2 patterns of up to N.sup.2 interconnection weight encoded beams projected by N.sup.2 planar, or essentially two-dimensional, holograms arranged in a spatially localized array within the holographic component. The SLM modulates the encoded beams and directs them onto the detecting surface wherein a parameter of the beams is evaluated at each pixel thereof. The evaluated parameter is transformed according to a nonlinear threshold function to provide transformed signals which can be fed back to the SLM for further iterations.

Growing community of inventors

Huntsville, AL, United States of America

H John Caulfield