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

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