Method and Apparatus for Imaging an Object in or Through a Scattering Medium by Using Multiple-Wave Mixing.
Patent Application, Filed 30 Nov 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent application discloses method and apparatus for imaging an object that is part of, embedded in, or view through a scattering medium. 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 scattering medium. A multiple-wave mixing call is disposed to receive the signal light beam from 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 signal light beam emitted from the scattering medium. The apparatus can further include a detector to record the image of the object in the object in the image-bearing beam
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