Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1996-08-07
1998-08-11
Nguyen, Thong
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 10, 359 3, 359 7, 359 28, 359 32, 359 24, 365125, 365216, 365124, G03H 110, G03H 112, G03H 102, G11C 1304
Patent
active
057935041
ABSTRACT:
A plurality of holograms are simultaneously angularly and spatially multiplexed within a storage medium by writing the holograms at different locations within the storage medium using reference and object beams directed thereto via cooperating reference beam and object beam scanners, respectively. The simultaneously angular and spatially multiplexed holograms are subsequently read-out by directing a reference beam through a desired location within the storage medium using the reference beam scanner. The reference beam is directed from the storage medium to a phase conjugator which conjugates the phase of the reference beam and directs the phase conjugated reference beam back to the same desired location within the storage medium so as to excite a corresponding conjugate object beam which is then directed onto a detector array.
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Anderson Terry J.
Chang Audrey
Hoch Jr. Karl J.
Nguyen Thong
Northrop Grumman Corporation
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