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US 5,675,436 AGranted
Optical image processor employing a nonlinear medium with active gain
AssigneeLucent Technologies Inc.
InventorsTheodoor Charlouis Damen, Hailin Wang
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Abstract
An optical image processor includes a nonlinear active gain medium for recording an interference pattern that corresponds to the Fourier transform of an input image or the multiplicative product of the Fourier transforms of two respective input images.
Claims8
An optical image processor, comprising:
- a) first and second coherent input beams of light;
- b) means for impressing on the first input beam a coherent spatial, intensity-modulation pattern corresponding to at least a first input image;
- c) a lens for creating a Fourier transform of the modulation pattern;
- d) a third input beam having impressed thereon a coherent modulation pattern corresponding to at least a second input image;
- and
- e) a nonlinear medium for coherent processing by a four-wave mixing process, (i) the modulation pattern created from the Fourier transform, (ii) said second input beam and (iii) the second input image, to generate a modulated output beam, said nonlinear medium including an active gain medium operable to impart gain, by at least one of optical pumping and electrical injection, to the first input beam having an intensity modulation pattern impressed thereon.
3 more elements
Dependencies are inferred from the claim text.