Nearly wavelength-independent systems for broadband security applications

P. Andrés; E. Tajahuerce; G. Mínguez-Vega

doi:10.1117/12.627858

23 September 2005 Nearly wavelength-independent systems for broadband security applications

P. Andrés, E. Tajahuerce, G. Mínguez-Vega

Author Affiliations +

Proceedings Volume 5954, Optical Security Systems; 59540F (2005) https://doi.org/10.1117/12.627858
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

We describe the application of nearly wavelength-independent optical processors to develop several broadband security techniques. Our achromatic optical configurations, based in the appropriate combination of a small number of diffractive and refractive lenses, are designed to work under temporally incoherent illumination. In this way, we are able to develop a method to reconstruct color Fourier holograms, an optical system to perform color pattern recognition and a technique to encrypt and decrypt color input objects, in all cases under white-light illumination. Moreover, we extend these ideas to work under both spatially and temporally incoherent illumination. This allows us to perform color pattern recognition and optical encryption techniques under natural light.

Citation Download Citation

P. Andrés, E. Tajahuerce, and G. Mínguez-Vega "Nearly wavelength-independent systems for broadband security applications", Proc. SPIE 5954, Optical Security Systems, 59540F (23 September 2005); https://doi.org/10.1117/12.627858

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