17 November 2000 Content-addressable holographic databases
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Abstract
Holographic data storage allows the simultaneous search of an entire database by performing multiple optical correlations between stored data pages and a search argument. We have recently developed fuzzy encoding techniques for this fast parallel search and demonstrated a holographic data storage system that searches digital data records with high fidelity. This content-addressable retrieval is based on the ability to take the two-dimensional inner product between the search page and each stored data page. We show that this ability is lost when the correlator is defocussed to avoid material oversaturation, but can be regained by the combination of a random phase mask and beam confinement through total internal reflection. Finally, we propose an architecture in which spatially multiplexed holograms are distributed along the path of the search beam, allowing parallel search of large databases.
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Felix Grawert, Sebastian Kobras, Geoffrey W. Burr, Hans J. Coufal, Holger Hanssen, Marc Riedel, C. Michael Jefferson, Mark C. Jurich, "Content-addressable holographic databases", Proc. SPIE 4109, Critical Technologies for the Future of Computing, (17 November 2000); doi: 10.1117/12.409218; https://doi.org/10.1117/12.409218
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KEYWORDS
Fourier transforms

Spatial light modulators

Holography

Low-intensity laser therapy

Databases

Holograms

Tin

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