Method and apparatus for copying holographic disks

A multi-faceted holographic disk can be copied in a one-step process by using a source disk (18), actually a sandwich of two thin film layers (28, 44) of photosensitive material. The first thin film layer (28) is capable of producing multiple reference beams simultaneously. The second thin film laye...

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Bibliographische Detailangaben
1. Verfasser:	DICKSON, LEROY DAVID
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHIC PROCESSES OR APPARATUS HOLOGRAPHY INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS
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Beschreibung
Zusammenfassung:	A multi-faceted holographic disk can be copied in a one-step process by using a source disk (18), actually a sandwich of two thin film layers (28, 44) of photosensitive material. The first thin film layer (28) is capable of producing multiple reference beams simultaneously. The second thin film layer (44) is a "master" copy of the disk to be copied. Both layers are produced using known off-axis holographic techniques. A target disk (20), having an unexposed film (54) of photosensitive material is located adjacent the second thin film layer (44). The source disk (18) is illuminated with coherent light (58), preferably in the form of a conical beam with an apparent point of origin on an axis through the common centers of the source and target disks.