Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1991-02-13
1992-06-30
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 24, 359 28, 359 30, G03H 112, G03H 126
Patent
active
051268620
ABSTRACT:
A method is provided for reconstructing an image transmitted through a thick distorting medium. A remote source provides coherent light at the object plane, and a local source, typically derived from the remote source, provides corresponding light that is coherent with respect to the remote source. Light from the remote source is directed through the thick aberrator and into a holographic medium, such as a photorefractive crystal, to interact with corresponding light from the local source and produce a volume hologram. An angularly multiplexed volume hologram, which covers the entire object field, is written into the holographic medium by successive exposures of light from the remote and local sources for successive pixels of the object plane. Light from an object, which comprises two-dimensional information from the object plane, can be reconstructed by the volume hologram after being distorted by the thick aberrator. Light from each point of the object accesses the set of gratings in the volume hologram and reconstructs only the reference wave associated with it. Reconstructed waves emerging from the hologram are then focused by a following lens to form a high resolution image of the object at the image plane of the lens.
REFERENCES:
patent: 3606519 (1971-09-01), Kurtz
patent: 3615123 (1971-10-01), Wuerker
patent: 3639033 (1972-02-01), Haines
patent: 3677617 (1972-07-01), Upatnieks
patent: 3704930 (1972-12-01), McMahon
patent: 3774986 (1973-11-01), Boorgoin et al.
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patent: 4364627 (1982-12-01), Haines
Papi et al., "Imaging by Microwave Holography Through Aberrating Media," IEEE Transactions on Antennas and Propagation, vol. AP-24, No. 6, Nov. 1976, pp. 832 to 836.
Chang Tallis Y.
Hong John H.
Arnold Bruce Y.
Lerner Martin
McFarren John C.
Rockwell International Corporation
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