US Government as Represented by the Secretary of the Army

Charles Garvin

Philip S Brody

Neelam Gupta

George J Simonis

GaAs base optical waveguide-based structure for a neural network is discld which may form the basic functional building block of a neural architecture in which the waveguide architecture contains at least three electrically active components which are electrically isolated from each other. The waveguide parameters are such that the laser light propagating through the waveguide is a single-mode in both transverse and lateral directions. A superlattice structure is incorporated in the waveguide core and results in electroabsorption of the input laser light. An electric field is supplied to the active components in order to change the transmission properties of the core material, thus modulating the light passing through the core material.

Optoelectronic waveguide neural architecture

A method for producing an intensity contrast image from phase detail in a transparent phase object also removes spurious background artifacts and speckle from the light source resulting in clearer images. A laser beam or other coherent light source is directed through the transparent phase object and focused into a photorefractive hologram recording crystal where a temporary volume phase hologram is formed. Once the hologram has formed a phase conjugate beam is created and passes back through the transparent phase object and is directed to an apparatus which records an intensity background pattern consisting of coherent artifacts. The transparent phase object is then mechanically shifted or allowed to move on its own in the case of transparent living specimens. The light source is directed through the physically translated transparent phase object and focused into the photorefractive hologram recording crystal. Another phase conjugate beam, of the original unshifted phase object, is created and passes back through the physically translated transparent phase object and is directed to the apparatus which records the intensity image due to the phase conjugate of the original optical field passing through the physically translated phase object. The intensity pattern containing the background coherent artifacts is then subtracted from this intensity image which also contains the same background artifacts, resulting in an intensity image of the transparent phase object without coherent artifacts.

Growing community of inventors

Adelphi, MD, United States of America

Charles Garvin