Optical: systems and elements – Diffraction – Using fourier transform spatial filtering
Patent
1994-04-28
1996-02-20
Lerner, Martin
Optical: systems and elements
Diffraction
Using fourier transform spatial filtering
359 7, 359561, 364822, 382210, G02B 2742, G02B 2746, G06E 300, G06K 976
Patent
active
054934443
ABSTRACT:
An all-optical nonlinear joint transform correlator has been implemented for the first time without using a spatial light modulator and digital processing in the Fourier plane. The correlator utilizes energy transfer from two-beam coupling in the Fourier plane. A compressional nonlinearity in the hard-clipped regime is implemented by pumping a weak plane wave with the intense joint spectrum of the reference and signal images. Operation of this device rivals or exceeds that of the phase-only filter for detecting objects in cluttered noise. Experimental results are compared with both plane wave and beam propagation simulations.
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Cronin-Golomb Mark
Gianino Peter D.
Khoury Jehad
Woods Charles L.
Collier Stanton E.
Lerner Martin
Nathans Robert L.
The United States of America as represented by the Secretary of
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