Optical: systems and elements – Diffraction – Using fourier transform spatial filtering
Patent
1990-04-04
1991-12-10
Arnold, Bruce Y.
Optical: systems and elements
Diffraction
Using fourier transform spatial filtering
359558, 359495, 382 42, G02B 2746
Patent
active
050723146
ABSTRACT:
An optical image enhancer includes a beam of coherent light for carrying an input image and a first lens for receiving the beam and performing a spatial Fourier transform of the input image. A photorefractive crystal at the Fourier plane receives the transformed image, while a coherent pump beam illuminates selected spatial frequency components of the transformed image at the Fourier plane, thereby transferring energy to the selected frequencies by two-beam coupling. A second lens receives the transformed image from the Fourier plane and performs a spatial Fourier transform of the transformed image, thereby reproducing the input image in an output image which contains intensified features corresponding to the selected spatial frequency components. A spatial light modulator may be used to cause the pump beam to illuminate the selected spatial frequency components of the transformed image at the Fourier plane. The pump beam can carry the Fourier transform of a selected portion of the input image, such that the intensity of the selected portion is increased in the output image.
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Arnold Bruce Y.
Deinken John J.
Rockwell International Corporation
Ryan J. P.
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