El procesador opera en tiempo real. We use four-wave mixing to record encrypted image into a photorefractive crystal BSO and decode it by phase conjugation. In each image encrypted only use a key. We characterize the processor in terms of the phase values of the key, and determine the lower limit of the average value of the phase in which we obtained a full encryption.
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File:Difracción de fresnel en forma de cuadro.jpg
In optics , the Fresnel diffraction equation for near-field diffraction is an approximation of the Kirchhoff—Fresnel diffraction that can be applied to the propagation of waves in the near field. In contrast the diffraction pattern in the far field region is given by the Fraunhofer diffraction equation. The near field can be specified by the Fresnel number , F of the optical arrangement. However, the validity of the Fresnel diffraction integral is deduced by the approximations derived below. Specifically, the phase terms of third order and higher must be negligible, a condition that may be written as. The multiple Fresnel diffraction at closely spaced periodical ridges ridged mirror causes the specular reflection ; this effect can be used for atomic mirrors. Some of the earliest work on what would become known as Fresnel diffraction was carried out by Francesco Maria Grimaldi in Italy in the 17th century.