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Proceedings Paper

Digital controller applied to phase control in photorefractive crystals
Author(s): Héctor Lorduy G.; J. Albeiro Valencia
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Paper Abstract

The photorefractive crystals are electro-optic materials and photoconductors, have the property that the refractive index changes locally when is illuminated by a no uniform spatial light distribution. The non-uniformity is produced by the interference of two coherent beams, one known as signal beam and the other one as reference beam. The intensity pattern produces inside the sample a local redistribution of the electric field inducing a change in the refraction index by a linear electro-optic effect known as index grating, all the incidents beams on the grating are diffracted. The purpose of this study is evaluate the use of a digital controller for the improving of the system stability. It is then shown the dynamic simulation of the experimental scheme for the self-stabilized system using a PI controller tuned as an internal model controller IMC.

Paper Details

Date Published: 18 November 2013
PDF: 10 pages
Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785AX (18 November 2013); doi: 10.1117/12.2022206
Show Author Affiliations
Héctor Lorduy G., Univ. Pontificia Bolivariana (Colombia)
J. Albeiro Valencia, Servicio Nacional de Aprendizaje (Colombia)

Published in SPIE Proceedings Vol. 8785:
8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications
Manuel Filipe P. C. Martins Costa, Editor(s)

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