Physics – Optics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6272e.166k&link_type=abstract
Advances in Adaptive Optics II. Edited by Ellerbroek, Brent L.; Bonaccini Calia, Domenico. Proceedings of the SPIE, Volume 6272
Physics
Optics
Scientific paper
In the framework of the MCAO Demonstrator MAD, ESO has developed a turbulence generator called MAPS to emulate a 3D evolving Paranal atmosphere. An all-optical solution has been chosen to produce the turbulence: a set of rotating refractive Phase Screens in which are imprinted patterns distorting the WF as the atmosphere would. In order to characterize the turbulence produced by MAPS, we have used several independent techniques (static WF measurements, long-exposure PSF, AO closed loop voltages) from the WF sensing wavelengths to the near-IR imaging ones. Such a characterization is essential to a further comparison between the lab results and the future on-sky measurements. This analysis required to study the link between the different parameters generally used to quantify the turbulence, in particular the Fried parameter r0, the seeing and the FWHM of long-exposure images. The conclusions are that the outer scale L0 has a preponderant influence on those values. This study will be completed by future on-sky measurements allowing to establish how realistic is the turbulence produced by the Phase Screens in MAPS.
Kolb Johann
Marchetti Enrico
Oberti Sylvain
Quiros-Pacheco Fernando
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