Volume-holographic inner product processor

Details Volume-holographic inner product processor Volume-holographic inner product processor

1991-12-20

1993-08-10

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Having particular recording medium

359561, 359559, 382 31, 382 42, 364822, 364827, 395 25, G03H 116

Patent

active

052354393

ABSTRACT:
A pattern recognition apparatus and a method for operating same. The apparatus includes a volume holographic medium (4) having a plurality of Fourier-space volume holograms representing pattern templates stored within. The apparatus further includes a spatial light modulator (1) and a phase encoder (2). The phase encoder has an output optically coupled to the medium by a first Fourier transform lens (3). The spatial light modulator spatially modulates a spatially uniform laser beam (7) in accordance with an unknown pattern. The two-dimensional phase encoder causes the spatially modulated laser beam to be spatially distributed prior to application to the medium. The apparatus further includes a detector (6, 11) having an input optically coupled by a second Fourier transform lens (5) means to an angular spectrum of plane waves generated by the medium in response to the output of the spatial modulator, phase encoder, and first Fourier lens. The detector detects plane waves that correspond to vector inner products generated within medium (4) in response to the unknown pattern.

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