Method and apparatus for holographically recording and reproduci

Details Method and apparatus for holographically recording and reproduci Method and apparatus for holographically recording and reproduci

1993-08-20

1996-05-21

Turner, Samuel A.

Optical: systems and elements

Holographic system or element

For producing or reconstructing images from multiple holograms

359 29, 365125, 369103, G11C 1304

Patent

active

055195172

ABSTRACT:
A tape cartridge (12) is provided for storing holographic recordings in a longitudinal holographic storage media tape (14). The tape (14) is comprised of a thin holographic storage media such as a photopolymer. A laser (54) is operable to generate a coherent light beam, which is then positioned on a given row of storage regions (42) on the surface of the tape (14). A positioning/angle multiplexing device (90) is operable to both position a reference beam (60) and a data beam (62) onto a select one of the storage regions in a given row on the surface of the tape (14). The tape (14) is incremented a row at a time for each scan operation wherein both the reference and the data beams during a Write operation, and only the reference beam during the playback operation, are moved along a given row. The spinning polygon mirror (56) is utilized to provide both positioning along a given row and angle multiplexing in a select storage region, with the optic system removing the angular information from the data beam (62). Data is superimposed on the data beam by an SLM (76).

REFERENCES:
patent: 3657473 (1972-04-01), Corcoran
patent: 3758187 (1973-09-01), Thomas et al.
patent: 3947640 (1976-03-01), Ruell et al.
patent: 4094011 (1978-06-01), Nagao
"Gigabit/Second Recording with Holography", Bardos et al, Electro-Optical Systems Design Confrence, Sep. 1973, 90-101.

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