Static information storage and retrieval – Read/write circuit – Optical
Patent
1993-03-08
1995-07-25
Popek, Joseph A.
Static information storage and retrieval
Read/write circuit
Optical
365124, 365125, 365215, G11C 1304
Patent
active
054368677
ABSTRACT:
Disclosed is a spatial multiplexer for use with a holographic storage medium, and an information storage system employing the spatial multiplexer. The spatial multiplexer directs a reference beam of optical radiation onto the storage medium, the storage medium having (n) rows and (m) columns of storage locations. The spatial multiplexer includes an array of (n times m) discrete reflector elements each having a linear shape. The discrete reflector elements are disposed in a parallel arrangement with one another upon a substrate, and each has a different angular orientation with respect to the storage medium. A deflection of the reference beam by an angle multiplexer changes the angle of incidence of the reference beam on the storage medium, which provides multiple angles required for angle multiplexing a plurality of superimposed holograms within a single storage location. A deflection of the reference beam by the spatial multiplexer specifies one of the plurality of reflectors, and thus selects one of the storage locations upon which the angle multiplexed reference beam is incident.
REFERENCES:
patent: 3703328 (1972-11-01), Glass et al.
patent: 3806897 (1974-04-01), Buchan et al.
patent: 4120569 (1978-10-01), Richards, Jr.
patent: 4449785 (1984-05-01), Huignard et al.
patent: 4636027 (1987-01-01), Dube
patent: 4883963 (1989-11-01), Kemeny et al.
patent: 4886341 (1989-12-01), Oishi et al.
patent: 5005946 (1991-04-01), Brandstetter
patent: 5007690 (1991-04-01), Chern et al.
patent: 5028102 (1991-07-01), Ogura et al.
D. von der Linde, Photorefractive effects for reversible holographic storage of information, Oct. 1975, Applied Physics, vol. 8, No. 2, pp. 85-100.
"Spatially--and Angle-multiplexed Holographic Random Access Memory," Fai Mok, Demetri Psaltis, and Geoffrey Burr, SPIE vol. 1773, Photonic Neural Networks (1992).
F. H. Mok et al., "Storage of 500 High-Resolution Holograms in a LiNbO.sub.3 Crystal", Optics Letters, Apr. 15, 1991, vol. 16, No. 8, pp. 605-607.
Anderson Terry J.
Hoang Huan
Hoch Jr. Karl J.
Northrop Grumman Corporation
Popek Joseph A.
LandOfFree
Holographic random access memory does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Holographic random access memory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Holographic random access memory will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-745038