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Nouveaux interféromètres large bande pour l'imagerie
haute résolution : interféromètre fibré hectométrique ;
utilisation des Fibres à Cristaux Photoniques

Abstract : High resolution imaging has reached a high reliability and currently gives a lot of scientific results. Nowadays, we may develop this technique by using very long baselines and/or new optical waveguides. Moreover, astronomers are working with wide band spectra to get more light. Thus, the study of wide band interferometers is essential. This manuscript reports the development and the characterization of wide band fiber interferometers.
The first part deals with some theoretical notions. The second part is dedicated to the study of silica optical fibers in the frame of the `OHANA project. The aim of this project driven by Paris Observatory is to coherently link the telescopes of the Mauna Kea in Hawaii thanks to optical fibers. The differential chromatic dispersion of the 300-m long fibers dedicated to link CFHT and Gemini telescopes has been characterized and minimized. The effect of the temperature variation has been also studied. Solutions using an optical fiber delay line or CaF2 glasses plates have been proposed and implemented to compensate the additional chromatic dispersion due to temperature effects. The last part of this manuscript is devoted to the study of Photonic Crystal Fibers (PCFs) for wide band interferometry. A two-beam and a three-beam interferometers have been implemented to test the properties of PCFs. It has been shown that the microstructured fibers used in our experiment are able to coherently propagate light over a wide spectral domain from 670 nm to 1550 nm. This wide domain is impossible to reach with "conventional" fibers. At last, closure phase measurements have been carried out showing that these PCFs do not bring additional efects on these measurements.
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Submitted on : Wednesday, March 22, 2006 - 1:12:54 AM
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Sébastien Vergnole. Nouveaux interféromètres large bande pour l'imagerie
haute résolution : interféromètre fibré hectométrique ;
utilisation des Fibres à Cristaux Photoniques. Optique / photonique. Université de Limoges, 2005. Français. ⟨tel-00012003⟩

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