Physics – Optics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..280r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 280-290. Research supported by European Southern Obs
Physics
Optics
72
Adaptive Optics, Seeing (Astronomy), Telescopes, Atmospheric Turbulence, Image Processing, Infrared Radiation, Interferometry, Optical Properties
Scientific paper
This paper reports the results of the first observations made on a large (3.6-m) telescope with the adapative optics prototype, named COME-ON, conceived to explore the application of this technique for the European Very Large Telescope. The wavefront is studied, after its correction by the servo-system, using a Zernike polynomial expansion. The analysis of uncorrected and corrected images in the near-infrared (equal to or less than 5 microns) leads to a detailed evaluation of the system performance in terms of improvement of angular resolution (reaching nearly the ideal diffraction profiles down to 2.2 microns), and Strehl ratio (approaching 0.6 to 0.8 at 3.8 microns). Sets of short-exposure images allow to deduce some important parameters on the temporal effects of the correction, such as an enhancement of the speckel modulation transfer function.
Fontanella Jean-Claude
Gaffard Jean-Paul
Kern Peter
Léna Pierre
Merkle Fritz
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