Optical: systems and elements – Holographic system or element – For producing or reconstructing images from multiple holograms
Patent
1998-11-13
2000-02-01
Henry, Jon
Optical: systems and elements
Holographic system or element
For producing or reconstructing images from multiple holograms
359 3, 359 35, 369103, 369109, 369122, 369112, 369 4423, G03H 126, G11B 700
Patent
active
060209852
ABSTRACT:
Digital data bits are stored as discrete-level reflection microholograms in a multi-depth digital optical data storage system. Reference and signal beams are incident in a counterpropagating geometry on opposite faces of a tape. The reflection microholograms are stored at the coinciding focus of the reference and signal beams. The holograms are stored at the diffraction limit of high-N.A. optics, and have relatively high grating frequencies and small sizes. Dynamic aberration compensators correct for the depth-varying spherical aberration imparted to the beams by the medium. Multiple mutually-incoherent lasers are used for parallel storage and retrieval to increase data transfer rates. Achievable densities and signal-to-noise ratios are substantially higher than for index-perturbation or transmission hologram storage methods.
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Daiber Andrew J.
Hesselink Lambertus
McDonald Mark E.
McLeod Robert R.
Sander Ingolf
Henry Jon
Siros Technologies, Inc.
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