$Photorefractive device for controlling information flow$

Photorefractive device for controlling information flow

Three separate input beams of light can be combined in a photorefractive material and outputs one signal. Each of the three input beams can carry information, for example, by passing each input beam through a glass slide with opaque lettering. The message may be segmented and a portion of it placed...

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Bibliographische Detailangaben
1. Verfasser:	FISCHER GEORGE L
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	Three separate input beams of light can be combined in a photorefractive material and outputs one signal. Each of the three input beams can carry information, for example, by passing each input beam through a glass slide with opaque lettering. The message may be segmented and a portion of it placed in each input beam for security reasons. Only the output beam contains the full message. Further, the invention can be used as an all-optical three-input AND gate. A signal is only produced when all three beams of light are present.