The active phasing experiment: Part II. Design and developments

F. Gonte; N. Yaitskova; F. Derie; C. Araujo; R. Brast; B. Delabre; P. Dierickx; C. Dupuy; C. Frank; S. Guisard; R. Karban; L. Noethe; B. Sedghi; I. Surdej; R. Wilhelm; M. Reyes; S. Esposito; M. Langlois

doi:10.1117/12.672057

26 June 2006 The active phasing experiment: Part II. Design and developments

F. Gonte, N. Yaitskova, F. Derie, C. Araujo, R. Brast, B. Delabre, P. Dierickx, C. Dupuy, C. Frank, S. Guisard, R. Karban, L. Noethe, B. Sedghi, I. Surdej, R. Wilhelm, M. Reyes, S. Esposito, M. Langlois

Author Affiliations +

Proceedings Volume 6267, Ground-based and Airborne Telescopes; 626730 (2006) https://doi.org/10.1117/12.672057
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

The purpose of the Active Phasing Experiment, designed under the lead of ESO, is to validate wavefront control concepts for ELT class telescopes. This instrument includes an Active Segmented Mirror, located in a pupil image. It will be mounted at a Nasmyth focus of one of the Unit Telescopes of the ESO VLT. APE contains four different types of phasing sensors, which are developed by Istituto Nazionale di Astrofisica in Arcetri, Instituto Astrofisica Canarias, Laboratoire d'Astrophysique de Marseille and ESO. These phasing sensors can be compared simultaneously under identical optical and environmental conditions. All sensors receive telecentric F/15 beams with identical optical quality and intensity. Each phasing sensor can measure segmentation errors of the active segmented mirror and correct them in closed loop. The phasing process is supervised by an Internal Metrology system developed by FOGALE Nanotech and capable of measuring piston steps with an accuracy of a few nanometers. The Active Phasing Experiment is equipped with a turbulence generator to simulate atmospheric seeing between 0.45 and 0.85 arcsec in the laboratory. In addition, the Active Phasing Experiment is designed to control simultaneously with the phasing corrections the guiding and the active optics of one of the VLT Unit Telescopes. This activity is supported by the European Community (Framework Programme 6, ELT Design Study, contract No 011863).

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F. Gonte, N. Yaitskova, F. Derie, C. Araujo, R. Brast, B. Delabre, P. Dierickx, C. Dupuy, C. Frank, S. Guisard, R. Karban, L. Noethe, B. Sedghi, I. Surdej, R. Wilhelm, M. Reyes, S. Esposito, and M. Langlois "The active phasing experiment: Part II. Design and developments", Proc. SPIE 6267, Ground-based and Airborne Telescopes, 626730 (26 June 2006); https://doi.org/10.1117/12.672057

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