Spatially incoherent holographic correlator

Details Spatially incoherent holographic correlator Spatially incoherent holographic correlator

1991-06-10

1992-08-11

Berman, Jack I.

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

359 29, 364822, 382 31, 382 42, G02B 2746

Patent

active

051384892

ABSTRACT:
An incoherent holographic correlator comprising a two-dimensional array of surface-emitting lasers which are selectable in an arbitrary pattern so as to emit a beam containing the pattern. The pattern is spatially incoherent because the lasers are not phase-locked but it is temporally coherent. The beams are collimated onto a recorded hologram, and each of the beams produces a diffracted beam from the recording. All the diffracted beams are focused onto an imaging plane. A high-intensity spot represents a strong correlation between the selected pattern on the laser array and the image previously recorded in the hologram.

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