Halographic process for the real-time storage and retrieval of h

Details Halographic process for the real-time storage and retrieval of h Halographic process for the real-time storage and retrieval of h

1974-12-16

1976-10-19

Hecker, Stuart N.

Communications: electrical

Digital comparator systems

350 35, G11C 800, G11C 1304, G11C 700

Patent

active

039874214

ABSTRACT:
The process consists in splitting the information into N groups of M bits, in recording the groups on N parallel tracks on the carrier, in the form of M holograms differentiated from each other by the pitch of the interference fringes constituent of each hologram. To this end, either a laser of variable wavelength is used, or a reference beam of variable direction. The M holograms are superimposed. At the play-back stage, a fixed coherent light beam projected onto one hologram generates NM beams of different directions. N rows of M photodiodes detect the beams and supply read-out means.

REFERENCES:
patent: 3657473 (1972-04-01), Corcoran
patent: 3812496 (1974-05-01), Brooks
patent: 3891976 (1975-06-01), Carlsen
B398,551 Jan. 1975, Fukuhara, 340/173 LM.
Roberts et al., High Speed Holographic Digital Recorder; Component Developments and System Experiments, Digest of Technical Papers of Topical Meeting on Optical Storage of Digital Data, 3/19-21/73, pp. WA3-1-4.

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