Active Phasing Experiment: preliminary results and prospects

F. Gonte; C. Araujo; R. Bourtembourg; R. Brast; F. Derie; P. Duhoux; C. Dupuy; C. Frank; R. Karban; R. Mazzoleni; L. Noethe; I. Surdej; N. Yaitskova; R. Wilhelm; B. Luong; E, Pinna; S. Chueca; A. Vigan

doi:10.1117/12.790342

17 July 2008 Active Phasing Experiment: preliminary results and prospects

F. Gonte, C. Araujo, R. Bourtembourg, R. Brast, F. Derie, P. Duhoux, C. Dupuy, C. Frank, R. Karban, R. Mazzoleni, L. Noethe, I. Surdej, N. Yaitskova, R. Wilhelm, B. Luong, E, Pinna, S. Chueca, A. Vigan

Author Affiliations +

Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70120Z (2008) https://doi.org/10.1117/12.790342
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The purpose of the Active Phasing Experiment, designed under the lead of ESO, is to study new phasing technologies and to validate wavefront control concepts for Extremely Large Telescopes. The Active Phasing Experiment is currently tested in the laboratory at the ESO headquarters and will be tested on sky at a Nasmyth focus of a VLT unit telescope at the end of 2008. The test bench contains four different phasing sensors which are tested in parallel to compare them under the same conditions. They have been developed by Istituto Nazionale di Astrofisica in Florenze, Instituto Astrofisica Canarias in Tenerife, Laboratoire d'Astrophysique de Marseille and ESO. It includes also an Active Segmented Mirror which simulates the segmentation of a primary mirror. A non-contact optical metrology has been developed by Fogale Nanotech to control it. The VLT focus and the VLT atmospheric conditions are simulated in the laboratory with a turbulence generator producing a seeing between 0.45 and 0.85 arcsec. Once installed on a VLT unit telescope, the control system of the Active Phasing Experiment will be able to control the phasing of the ASM, but also the guiding and the active optics of the VLT. This proceeding gives a brief summary of the opto-mechanical aspects of the Active Phasing experiment, describes its control system and gives an analysis of the preliminary results obtained in the laboratory.

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F. Gonte, C. Araujo, R. Bourtembourg, R. Brast, F. Derie, P. Duhoux, C. Dupuy, C. Frank, R. Karban, R. Mazzoleni, L. Noethe, I. Surdej, N. Yaitskova, R. Wilhelm, B. Luong, E, Pinna, S. Chueca, and A. Vigan "Active Phasing Experiment: preliminary results and prospects", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70120Z (17 July 2008); https://doi.org/10.1117/12.790342

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