Granularité laser et interférences de speckles

Details Granularité laser et interférences de speckles Granularité laser et interférences de speckles

2009-06-19

arxiv.org/abs/0906.3612v1

Bulletin de l'Union des Physiciens 101, 899(1) (2007) 1101-1121

Physics

Data Analysis, Statistics and Probability

Scientific paper

In this paper we introduce experimentally the phenomenon of speckle and its interferometric applications. With the popularization of CCD sensors and webcams, it is now easy to acquire speckles patterns, to reduce them and exploit them. The material used here is what we could find easily in high schools. All Image processing mentioned in this article could be done using the free software called IRIS. Keywords are essentially diffraction, interference phenomena and Fourier optics. After presenting the characteristics of speckles we discuss the phenomenon of speckles interferences by analogy with the conventional 2 and N waves interferences. Finally, we apply interferometry to measure the angular separation between the components of a double star in drawing heavily on the historical experience of Antoine Labeyrie.

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