Development of high-index optical coating for security holograms

Nadir A. G. Ahmed

doi:10.1117/12.402508

3 October 2000 Development of high-index optical coating for security holograms

Nadir A. G. Ahmed

Proceedings Volume 4149, Holography 2000; (2000) https://doi.org/10.1117/12.402508
Event: Holography 2000, 2000, St. Poelton, Austria

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.

Citation Download Citation

Nadir A. G. Ahmed "Development of high-index optical coating for security holograms", Proc. SPIE 4149, Holography 2000, (3 October 2000); https://doi.org/10.1117/12.402508

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