High areal density holographic data storage system
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United States of America Patent
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Jun 15, 2010
Grant Date -
Jul 13, 2006
app pub date -
Dec 6, 2005
filing date -
Jun 7, 2003
priority date (Note) -
Expired
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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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