High areal density holographic data storage system

Details High areal density holographic data storage system High areal density holographic data storage system

2005-12-06

2010-06-15

Allen, Stephone B (Department: 2872)

Optical: systems and elements

Holographic system or element

Having optical element between object and recording medium

C359S032000, C359S029000

Reexamination Certificate

active

07738152

ABSTRACT:
An apparatus for recording or reading high areal density holographically stored information with high signal-to-noise ratio. The apparatus comprises a holographic imaging system for recording or reconstructing a holographic image, having a first numerical aperture and a first focal length and an additional optical system for filtering the signal beam, having a second numerical aperture and a second focal length, wherein the numerical aperture of the additional optical system is less than the numerical aperture of the holographic imaging system and/or the focal length of the additional optical system is greater than the optical length of the holographic imaging system.

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