Digital controller applied to phase control in photorefractive crystals

Héctor Lorduy G.; J. Albeiro Valencia

doi:10.1117/12.2022206

18 November 2013 Digital controller applied to phase control in photorefractive crystals

Héctor Lorduy G., J. Albeiro Valencia

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 8785AX (2013) https://doi.org/10.1117/12.2022206
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

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.

Citation Download Citation

Héctor Lorduy G. and J. Albeiro Valencia "Digital controller applied to phase control in photorefractive crystals", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785AX (18 November 2013); https://doi.org/10.1117/12.2022206

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