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Optical Engineering

Labeling technique for nonplanar surfaces based on the combination of a diffractive axilens with digital holography methods
Author(s): Pablo Marin; Angel Lizana; Alba Peinado; Miguel Mora-González; Juan Campos
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Paper Abstract

A technique based on a spatial light modulator is proposed for the labeling of nonplanar surfaces. This technique arises from the combination of a general method for generation of digital holograms with a diffractive axilens. Unlike existing methods in which hologram contrast critically decreases out of the focal plane, our proposed approach allows the system to increase the focus depth, resulting in enhanced hologram images out of the focal plane. Two existing methods for hologram generation are theoretically and experimentally compared in terms of efficiency and contrast: the iterative Fourier transform algorithm-based method and the random multiplexing of different lenses method. The most suitable one is selected for the implementation of the new axilens-based technique. Experimental results obtained with the axilens method provide a significant enhancement of the image quality of holograms obtained out of the focal plane when compared with an existing technique. The approach proposed in this manuscript may be of interest in industrial applications, where alphanumeric data must be registered on nonflat surfaces, as in the cases of beverage cans or bottles.

Paper Details

Date Published: 28 May 2015
PDF: 8 pages
Opt. Eng. 54(5) 054109 doi: 10.1117/1.OE.54.5.054109
Published in: Optical Engineering Volume 54, Issue 5
Show Author Affiliations
Pablo Marin, Univ. Autònoma de Barcelona (Spain)
Angel Lizana, Univ. Autònoma de Barcelona (Spain)
Alba Peinado, Univ. Autònoma de Barcelona (Spain)
Miguel Mora-González, Univ. de Guadalajara (Mexico)
Juan Campos, Univ. Autònoma de Barcelona (Spain)

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