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Proceedings Article

MACAO-VLTI: an adaptive optics system for the ESO interferometer

[+] Author Affiliations
Robin Arsenault, Jaime Alonso, Henri Bonnet, Joar Brynnel, Bernard Delabre, Robert Donaldson, Christophe Dupuy, Enrico Fedrigo, Norbert N. Hubin, L. Ivanescu, Markus E. Kasper, J. Paufique, S. Rossi, Sebastien Tordo, Stefan Stroebele, Jean-Luis Lizon, Francoise Delplancke, A. Silber, Marco Quattri, Roland Reiss

European Southern Observatory (Germany)

Jacopo Farinato

Osservatorio Astronomico di Padova (Italy)

Pierre Gigan

Observatoire de Paris-Meudon/LESIA (France)

Proc. SPIE 4839, Adaptive Optical System Technologies II, 174 (February 1, 2003); doi:10.1117/12.458836
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From Conference Volume 4839

  • Adaptive Optical System Technologies II
  • Peter L. Wizinowich; Domenico Bonaccini
  • Waikoloa, Hawai'i, USA | August 22, 2002

abstract

MACAO stands for Multi Application Curvature Adaptive Optics. A similar concept is applied to fulfill the need for wavefront correction for several VLT instruments. MACAO-VLTI is one of these built in 4 copies in order to equip the Coude focii of the ESO VLT's. The optical beams will then be corrected before interferometric recombination in the VLTI (Very Large Telescope Interferometer) laboratory. MACAO-VLTI uses a 60 elements bimorph mirror and curvature wavefront sensor. A custom made board processes the signals provided by the wavefront detectors, 60 Avalanche Photo-diodes, and transfer them to a commercial Power PC CPU board for Real Time Calculation. Mirrors Commands are sent to a High Voltage amplifier unit through an optical fiber link. The tip-tilt correction is done by a dedicated Tip-tilt mount holding the deformable mirror. The whole wavefront is located at the Coude focus. Software is developed in house and is ESO compatible. Expected performance is a Strehl ratio sligthly under 60% at 2.2 micron for bright reference sources (star V<10) and a limiting magnitude of 17.5 (Strehl ~0.1). The four systems will be installed in Paranal successively, the first one being planned for June 2003 and the last one for June 2004.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Robin Arsenault ; Jaime Alonso ; Henri Bonnet ; Joar Brynnel ; Bernard Delabre, et al.
"MACAO-VLTI: an adaptive optics system for the ESO interferometer", Proc. SPIE 4839, Adaptive Optical System Technologies II, 174 (February 1, 2003); doi:10.1117/12.458836; http://dx.doi.org/10.1117/12.458836


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