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Qualification de IONIC, instrument de recombinaison interferometrique base sur des composants d'optique planaire dedie a l'astronomie

Abstract : Astronomical interferometry is an instrumental solution that benefit today by great developments in order to increase the angular resolution for astrophysical observations. However, some difficulties remains in the case of large ground based teslescope arrays, in particular the combination of an important number of telescopes. The work presented here is based on the development of the technologies of integrated optics for the interferometric combination of the telescope beams. I will show that this technology, first developed in the telecommunication field, also responds to astronomical requirements, particularly in terms of operation through wide wavelength ranges. Integrated optics give easy acces to spatial filtering and photometric calibration, two functions that have proved their efficiency for increasing the measurements quality. After the description of astronomical interferometry and its specific instrumental needs, I will present the general concept of planar integrated optics and the available functionalities. The laboratory tests of different beam combiners have led to the identification of key points for the realization of instruments based on this technology. The high contrast levels obtained validate the use of these functions for our astronomical applications. First on-sky fringes on the IOTA interferometer (Arizona, USA) with two telescopes have led to astronomical measurements compatible with previously published results. Thanks to the acquired experience, we have developed a second instrument combining three telescope beams for closure phase measurements. This instrument, under test nowaday, will give access to imaging thanks to the combination of visibilities and phases informations on the observed astrophysical object. Our development are now mature enough to emphasize the use of this technology for complex instrumental projects. This way, integrated optics has been chosen in the study of technological solutions for the IRSI-DARWIN spatial interferometer.
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Contributor : Pierre Haguenauer <>
Submitted on : Tuesday, October 4, 2005 - 6:29:14 PM
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  • HAL Id : tel-00010396, version 1




Pierre Haguenauer. Qualification de IONIC, instrument de recombinaison interferometrique base sur des composants d'optique planaire dedie a l'astronomie. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2001. Français. ⟨tel-00010396⟩



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