Optical system for the storage of selectively erasable binary da

Details Optical system for the storage of selectively erasable binary da Optical system for the storage of selectively erasable binary da

1975-06-26

1977-05-17

Stern, Ronald J.

Communications: electrical

Digital comparator systems

340173LM, 350 35, G03H 126, G03H 114

Patent

active

040245136

ABSTRACT:
The present invention relates to optical systems for the storage in the form of elementary holograms, of pages of binary data, said elementary hologram being stored in a two-dimensional or three-dimensional photosensitive medium. The system in accordance with the invention makes use of a photosensitive storage medium lending itself to the selective erasure of binary data, and which contains optical phase-shift devices which enable a phase-shift of 0.degree. or 180.degree. to be produced between the object beam and the reference beam depending upon whether it is desired to record or to erase the data.

REFERENCES:
patent: 3915549 (1975-10-01), Amodei
patent: 3924924 (1975-12-01), Fukuhara
Stroke, "Introduction to Coherent Optics and Holography," 2nd Ed., Academic Press, New York, 1969, pp. 90-96.
Collins, Applied Optics, vol. 7, No. 1, Jan. 1968, pp. 203-204.
Bromley, et al., Applied Optics, vol. 10, No. 1, Jan. 1971, pp. 174-181.

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