Optical: systems and elements – Optical frequency converter
Patent
1992-11-30
1993-12-14
Healy, Brian
Optical: systems and elements
Optical frequency converter
359334, 359 10, 359 27, 359 28, 359 34, 356347, 385122, 372 21, H03F 700, G01B 9021, H01S 310
Patent
active
052708535
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.
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Bashkansky Mark
Reintjes John F.
Healy Brian
Jameson George
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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