Holographic storage system with reduced noise

Details Holographic storage system with reduced noise Holographic storage system with reduced noise

2009-04-07

2011-11-29

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

C359S029000

Reexamination Certificate

active

08068263

ABSTRACT:
An apparatus for reading from and/or writing to transmission type holographic storage media is proposed, and more specifically a coaxial type apparatus for reading from and/or writing to transmission type holographic storage media with two or more reference beams, which has an improved Signal to Noise Ratio. The apparatus has a coaxial arrangement of two or more reference beams and an object beam or a reconstructed object beam. The reference beams are arranged on a circle around the object beam or the reconstructed object beam in a Fourier plane of the apparatus behind the holographic storage medium. A mirror is located in or close to this Fourier plane, which is designed such that it reflects the object beam or the reconstructed object beam without reflecting the reference beams.

REFERENCES:
patent: 6147782 (2000-11-01), Daiber et al.
patent: 6766958 (2004-07-01), Roh
patent: 7835048 (2010-11-01), Szarvas et al.
patent: 2007/0104069 (2007-05-01), Fukumoto et al.
patent: 1912212 (2008-04-01), None
patent: WO2006/003077 (2006-01-01), None
Search Report dated Sep. 24, 2008.

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