New combined embossed hologram originating technique was developed by the international team of holography experts. The technique merges deep 3D holographic images with commonly used hologram security features. Deep 3D images were first recorded on photoresist with Geola's holographic printer containing their proprietary pulsed laser. Optical security features were then overexposed onto the photoresist plates containing latent images of deep 3D scenes. The photoresist plates with several exposures (containing optical security features and deep 3D images) were developed. Embossed holograms, containing such effective public security features as full colour 3D images, guilloches, rainbow patterns were manufactured. Manufactured embossed holograms also contained such optical security features as microtext and laser readable hidden image.
Stanislovas Zacharovas, Ramūnas Bakanas, Andrejs Bulanovs, and Vadivelan Varadarajan, "Effective public security features for embossed holograms," Proc. SPIE 10127, Practical Holography XXXI: Materials and Applications, 1012702 (Presented at SPIE OPTO: January 30, 2017; Published: 6 April 2017); https://doi.org/10.1117/12.2248904.
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