Multiplex holography
AssigneeLucent Technologies Inc.
InventorsKevin Curtis, William Larry Wilson
Life of this patent
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Abstract
Use of an aperture in the reconstructed beam in reconstruction of multiple holograms increases selectivity beyond that realizable by spatial multiplexing so as to permit differentiation of overlapping images. "Aperturization" is suitably used for differentiation in the y-direction in shift holography, depending on Bragg selection in the x-direction.
Claims18
Process for shift holography comprising reconstruction of individual holograms contained in an array of partially overlapping individual holograms recorded in a medium, in which the array comprises rows of overlapping holograms defined as lying in the x-direction with rows arrayed in the y-direction, the process comprising illumination with a readout beam which is successively positioned, by movement of the beam and the medium relative to each other in order to locate each individual hologram, thereby producing a successively positioned reconstructed image beam, the readout beam and the reconstructed image beam defining a "readout plane",
- CHARACTERIZED IN THAT
- the readout beam has a y-component of direction, in that an aperture approximating the beam size in the y-direction in the medium is interposed in the reconstructed beam, whereby selectivity in the y-direction is increased.
Dependencies are inferred from the claim text.