Static information storage and retrieval – Information masking – Polarization
Patent
1974-10-09
1979-12-11
Stern, Ronald J.
Static information storage and retrieval
Information masking
Polarization
250550, 250199, 350 362, 350 378, 350 386, 365125, 365216, G11C 1102, G03H 130, G03H 122
Patent
active
RE0301663
ABSTRACT:
A holographic optical memory utilizes an optical heterodyne technique to significantly increase the signal-to-noise ratio during the readout stage of operation. A light source provides a coherent light beam which is split into a readout beam and a local oscillator beam. The readout beam is directed to one of the holograms stored in the memory medium and a portion of the readout beam is diffracted by the hologram to form a reconstructed image of the bit pattern stored in the hologram at the reconstructed image plane. The local oscillator beam is superimposed with the diffracted portion of the readout beam. An optical frequency translator is positioned in either the readout beam or the local oscillator beam to cause the beams to have different optical frequencies. Therefore, when the two beams are superimposed, a beat frequency signal is produced. An array of detectors is positioned at the reconstructed image plane to receive the superimposed beams. Each detector of the array is positioned to receive the light representing one bit of the bit pattern and to provide an output signal indicative of the intensity of the beat frequency signal received.
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Dahle Omund R.
Hanson Henry L.
Honeywell Inc.
Stern Ronald J.
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