A method of preparing a hologram having an increased replay wave

Radiation imagery chemistry: process – composition – or product th – Holographic process – composition – or product – Composition or product or process of making the same

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430 1, 430401, 430642, G03C 524, G03C 102, G03H 104

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047693002

ABSTRACT:
Holograms which contain gelatin as the binder are prepared by holographically exposing the holographic material by use of coherent light, developing the holographic image by a chemical or physical process and before processing, simultaneously or subsequently, treating the material with a solution of an onium compound which comprises at least one alkyl group having from 10 to 18 carbon atoms or in which the total number of carbon atoms in the substituent group is at least 15 or a polymeric compound which comprises at least one onium group in the repeating unit.

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J. W. Gladden, Review of Photosensitive Materials for Halographic Recordings, Technical Report, U.S. Army Engineer Topographic Laboratories, Fort Belvoir, VA, 22060, #ETL-0128, Apr. 1978.
L. H. Lin, Halogen Formation in Hardened Dichramated Gelatin Films, Applied Optics, vol. 8, No. 5, pp. 963-966, May 1969.

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