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Proceedings Paper

Development of high-index optical coating for security holograms
Author(s): Nadir A. G. Ahmed
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Paper Abstract

Over the past few years security holograms have grown into a complex business to prevent counterfeiting of security cards, banknotes and the like. Rapid advances in holographic technology have led to a growing requirement for optical materials and coating methods to produce such holograms at reasonable costs. These materials have specific refractive indices and are used to fabricate semi- transparent holograms. The present paper describes a coating process to deposit optical coating on flexible films inside a vacuum web metallizer for the production of high quality semi-transparent holograms.

Paper Details

Date Published: 3 October 2000
PDF: 6 pages
Proc. SPIE 4149, Holography 2000, (3 October 2000); doi: 10.1117/12.402508
Show Author Affiliations
Nadir A. G. Ahmed, Valmet General Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 4149:
Holography 2000
Tung H. Jeong; Werner K. Sobotka, Editor(s)

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