Accession Number : ADD016212
Title : Method and Apparatus for Imaging an Object in or Through a Scattering Medium by Using Multiple-Wave Mixing.
Descriptive Note : Patent, Filed 30 Nov 92, patented 14 Dec 93,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Bashkansky, Mark ; Reintjes, John F
Report Date : 14 Dec 1993
Pagination or Media Count : 10
Abstract : A method and apparatus for imaging an object that is part of, embedded in, or viewed through a scattering medium is provided. A broadband stochastic beam generator, such as a broadband laser, generates a broadband stochastic beam and a narrowband beam generator generates a narrowband beam. A non-linear mixing crystal receives the broadband stochastic beam and the narrowband beam and provides a signal light beam conjugate correlated with the broadband stochastic beam to the scattering medium. A multiple-wave mixing cell is disposed to receive the signal light beam from the scattering medium. An adjustable delay path also illuminates the multiple-wave mixing cell with the broadband stochastic beam. A supplemental beam generator is also provided for also additionally illuminating the multiple-wave mixing cell with a supplemental beam having characteristics sufficient to satisfy phase matching with the material of the multiple-wave mixing cell. The multiple-wave mixing cell produces an image-bearing beam which contains an image of an object extracted from the signal light beam emitted from the scattering medium. The apparatus can further include a detector to record the image of the object in the image-bearing beam.
Descriptors : *PATENTS, *LIGHT SCATTERING, *OPTICAL DETECTORS, *LASERS, BROADBAND, CELLS, CRYSTALS, IMAGES, LIGHT, MATCHING, FOUR WAVE MIXING, MIXING, NARROWBAND, PATHS, SCATTERING, SIGNAL LIGHTS, SIGNALS
Subject Categories : Optical Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE