Holographic method of recording and reading secret information

Details Holographic method of recording and reading secret information Holographic method of recording and reading secret information

G - Physics

03

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88/0.14

G03H 1/04 (2006.01) G03H 1/22 (2006.01) G06K 1/12 (2006.01) G06K 19/16 (2006.01) G07F 7/08 (2006.01) G07F 7/12 (2006.01) G09C 5/00 (2006.01) G11B 7/0065 (2006.01) G11C 13/04 (2006.01)

Patent

CA 1070996

ABSTRACT OF THE DISCLOSURE A method for establishing and reading secret information using holographic interference pattern techniques. A holographic plate is placed in a holder and exposed with a laser light reflected from an object and a reference laser light to create a hologram. The exposed hologram is removed and a second holographic plate is inserted into the holder. The object, which may be a matrix, is selectively deformed to provide letters or numbers in accordance with the secret information to be established. The second holographic plate is then exposed with a light reflected from the deformed object and with the reference laser light to create a second hologram. The information contained on each hologram, when viewed individually, appears to be substantially identical. However, when the two holograms are later combined and illuminated, the secret information in the form of a holographic interference pattern will be observed in the hologram.

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