Contact copying of reflection or volume holograms

Details Contact copying of reflection or volume holograms Contact copying of reflection or volume holograms

1989-02-10

1990-01-23

Arnold, Bruce Y.

350 371, G03H 120

Patent

active

048954195

ABSTRACT:
A method of preparing a reflection hologram which includes mounting a transmission hologram in register with a portion of transparent photosensitive holographic material there being present there between a filter to cut out zero order light transmitted through the transmission hologram, there being present on each side of an assembly which includes the hologram and the holographic material a light reflecting surface then causing a beam of light from a laser source to pass through a holographic optical element (H.O.E.) which splits the beam into two beams and causes both beams to scan in register over both the whole surface of the transmission hologram and the holographic material by directing the beams onto both reflecting surfaces so that one beam is reflected from one said reflecting surface and on passing through the transmission hologram takes-up the image information and passes through the filter to cut out the zero order light to the portion of transparent photosensitive holographic material where it interferes with the other beam which is reflected from the other reflecting surface into the holographic material then processing the holographic material to fix the holographic image therein.

REFERENCES:
patent: 3600056 (1971-08-01), King, Jr.
patent: 3647289 (1972-03-01), Weber
patent: 4235505 (1980-11-01), Hariharan et al.
patent: 4378142 (1983-03-01), Ono
patent: 4610499 (1986-09-01), Chern et al.
patent: 4712852 (1987-12-01), Funato et al.
Von A. W. Pressdee, "Holografische Kopien sind falschungssicher", 2253 Laser und Optoelektronik, 18 (1986) Mar., No. 1.
Ser. No. 697,792, filed 04/15/1969, Harper et al., Defensive Publication.
Par Y. Belvaux, "Duplication des Hologrammes", Annales De Radioelectricite, T. XXII., No. 88, Apr. 22, 1967.
"Preparation of Reflection Holograms by Interference Copying of Transmission Holograms", V. A. Vanin, 2287 Soviet J of Quantum Electronics, vol. 8, No. 7 (1978.07) New York.
Patent Abstract of Japan, vol 8, No. 31, Feb. 9, 1984.
Patent Abstract of Japan, vol. 10, No. 19, Jan. 24, 1986.

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