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Invariant grating pseudoimaging using polychromatic light and a finite extension source



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Sánchez Brea, Luis Miguel and Saez Landete, José and Alonso Fernández, José and Bernabeu Martínez, Eusebio (2008) Invariant grating pseudoimaging using polychromatic light and a finite extension source. Applied Optics, 47 (10). pp. 1470-1477. ISSN 1559-128X


Official URL: http://dx.doi.org/10.1364/AO.47.001470



The Talbot effect is a well studied phenomenon by which grating pseudoimages appear at certain periodic distances when monochromatic light is used. Recently, numerical simulations have shown a new phenomenon; when a polychromatic light beam is used in a double grating system, the intensity of the pseudoimages presents a transverse-profile that remains unaffected over a wide range of propagation distances. This effect can be used to increase the tolerances of gratings based optical devices, such as displacement measurement systems, interferometers, and spectrometers. The pseudoimages formation with a polychromatic and finite extension light source is analytically and experimentally demonstrated. Relatively simple analytical expressions for the intensity and the contrast allow us to predict when pseudoimages present a constant contrast and when they disappear. Furthermore, we experimentally obtain the pseudoimages using the proposed configuration, corroborating the theoretical predictions.

Item Type:Article
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© 2008 Optical Society of America.
This work has been supported by the “Codificación óptica de la posición a escala nanométrica: Nuevas tecnologías y dispositivos ópticos” project (DPI2005-02860) of the Ministerio de Educación y Ciencia of Spain and the “Tecnologías en ecología, alta precisión y productividad, multifuncionalidad, y tecnologías de la información y comunicaciones en Máquina Herramienta” CENIT project of the Ministerio de Industria, Turismo y Comercio. During the realization of this work, L. M. Sanchez-Brea was contracted by the Universidad Complutense de Madrid under the “Ramón y Cajal” research program of the Ministerio de Educación y Ciencia of Spain.

Uncontrolled Keywords:LAU, Illumination, Regime
Subjects:Sciences > Physics > Optics
ID Code:26259
Deposited On:17 Jul 2014 11:58
Last Modified:17 Jul 2014 11:58

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