Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1994-06-29
1997-05-06
Dzierzynski, Paul M.
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 10, 359 22, 359 29, 369102, 369103, G03H 112
Patent
active
056276648
ABSTRACT:
A method and apparatus for holographic storage with combined orthogonal phase codes and random phase codes are provided in which a reference beam (18) is encoded with a combination orthogonal phase code and random phase code by a phase encoder (28). A data pattern is imposed on an object beam (20) by pattern encoder (38). Both the reference beam (18) and the object beam (20) are directed to a particular stack site on a storage medium (32).
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E. Lee Kral, John F. Walkup, and Marion O. Hagler, "Correlation Properties of Random Phase Diffusers for Multiplex Holography," Applied Optics, vol. 21, No. 7, Apr. 1, 1992, pp. 1281-1290.
C. Denz, G. Pauliat, G. Roosen, and T. Tschudi, "Volume Hologram Multiplexing Using a Deterministic Phase Encoding Method," Optics Communications, Copyright 1991, pp. 171-176.
Steve Redfield and Lambertus Hesselink, "Data Storage in Photorefractives Revisited," SPIE, vol. 953, Optical Computing 88 (1988), pp. 35-45.
Dzierzynski Paul M.
Schuberg Darren E.
Tamarack Storage Devices, Inc.
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