caa a22 4500 445830158 CHVBK 20180317145312.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10686-010-9203-4 doi (NATIONALLICENCE)springer-10.1007/s10686-010-9203-4 Generation2 testbed of Fresnel imager: first results on the sky [Elektronische Daten] [Laurent Koechlin, Jean-Pierre Rivet, Paul Deba, Truswin Raksasataya, Thierry Gharsa, René Gili] We present and discuss the first sky images obtained with a second generation "Fresnel Diffractive Array Imager” (FDAI) prototype. These images have been made on high contrast multiple stars (STF-1273 and BU-893), and on Saturn. The focusing objective: a 200 × 200mm "Fresnel array”, is a 50μm-thick opaque foil featuring approximately 250,000specially shaped void apertures, corresponding to 696Fresnel zones. It focusses light by diffraction. This prototype has been installed in parallel to the 76cm "grand équatorial” (17.89m focal length) at the Observatoire de la Côte d'Azur, (Nice, France). The Fresnel array is attached close to the front end and on the side of the 19m long refractor's tube. The "receiver module” (field optics, chromatic corrector and cameras) is placed at prime focus of the Fresnel array, and attached to the refractor tube close to the rear end. The chromatic correction in the receiver module is adapted to 800 nm, but operates successfully in the two spectral bands used: 630-745nm and 750-950nm. This setup has been used to test the on-sky capabilities of the diffractive imaging system in angular resolution, limiting magnitude and contrast, and to experience some of the situations that will be encountered in a future space-borne formation flying configuration. We have obtained high contrast diffraction-limited images of various celestial sources, with a field of view larger than 500′′, a resolution of 0.8′′ at 800nm, and a dynamic range better than 10 − 5. Springer Science+Business Media B.V., 2011 Diffractive focusing nationallicence Formation flying nationallicence High angular resolution nationallicence High dynamic range nationallicence UV domain nationallicence Exoplanets nationallicence Koechlin Laurent Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut Rivet Jean-Pierre Université de Nice Sophia-Antipolis, CNRS, Observatoire de la cote d'Azur, UMR6202, B.P. 4229, 06304, NICE Cedex 4, France aut Deba Paul Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut Raksasataya Truswin Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut Gharsa Thierry Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut Gili René Université de Nice Sophia-Antipolis, CNRS, Observatoire de la cote d'Azur, UMR6202, B.P. 4229, 06304, NICE Cedex 4, France aut Experimental Astronomy Springer Netherlands 30/2-3(2011-06-01), 165-182 0922-6435 30:2-3<165 2011 30 10686 https://doi.org/10.1007/s10686-010-9203-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10686-010-9203-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Koechlin Laurent Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Rivet Jean-Pierre Université de Nice Sophia-Antipolis, CNRS, Observatoire de la cote d'Azur, UMR6202, B.P. 4229, 06304, NICE Cedex 4, France aut NATIONALLICENCE 700 1- Deba Paul Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Raksasataya Truswin Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Gharsa Thierry Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Gili René Université de Nice Sophia-Antipolis, CNRS, Observatoire de la cote d'Azur, UMR6202, B.P. 4229, 06304, NICE Cedex 4, France aut NATIONALLICENCE 773 0- Experimental Astronomy Springer Netherlands 30/2-3(2011-06-01), 165-182 0922-6435 30:2-3<165 2011 30 10686 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer