Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1996-05-10
1998-07-07
Henry, Jon W.
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 24, 365125, 369103, G03H 102, G03H 128, G11C 1304, G11B 724
Patent
active
057777608
ABSTRACT:
A method of holographic recording in a photorefractive medium wherein stored holograms may be retrieved with maximum signal-to noise ratio (SNR) is disclosed. A plurality of servo blocks containing position feedback information is recorded in the crystal and made non-erasable by heating the crystal. The servo blocks are recorded at specific increments, either angular or frequency, depending whether wavelength or angular multiplexing is applied, and each servo block is defined by one of five patterns. Data pages are then recorded at positions or wavelengths enabling each data page to be subsequently reconstructed with servo patterns which provide position feedback information. The method of recording data pages and servo blocks is consistent with conventional practices. In addition, the recording system also includes components (e.g. voice coil motor) which respond to position feedback information and adjust the angular position of the reference angle of a reference beam to maximize SNR by reducing crosstalk, thereby improving storage capacity.
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Akin, Jr. William R.
Beazley Lance D.
Carpenter Christopher M.
Ehrlich Richard M.
Hays Nathan J.
Chen John C.
Harrison David B.
Henry Jon W.
Quantum Corporation
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