Volume 399, Number 1, February III 2003
|Page(s)||373 - 383|
|Published online||05 February 2003|
Calibration of NAOS and CONICA static aberrations
Application of the phase diversity technique
Office National d'Études et de Recherches Aérospatiales, Département d'Optique Théorique et Appliquée, BP 72, 92322 Châtillon Cedex, France e-mail: email@example.com
2 Laboratoire des Signaux et Systèmes, École Supérieure d'Électricité, Plateau de Moulon, 91192 Gif-sur-Yvette, France
3 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
Corresponding author: T. Fusco, firstname.lastname@example.org
Accepted: 25 October 2002
We describe and evaluate the performance of a phase diversity wavefront sensor used to measure the static aberrations of the VLT instrument NAOS–CONICA. The main limitations of this phase diversity technique are compiled. We investigate the systematic errors due to the experimental implementation and the design restrictions. Further error sources stem from the imperfect knowledge of the system, and from limitations of the algorithm. The influence of these errors on the wavefront estimation is evaluated on numerical and experimental data. This study highlights the essential verifications and calibrations needed to obtain accurate results and gives a practical guideline for the application of a phase diversity wavefront sensor. The comprehensive calibration results and the final gain in optical performance are presented and discussed in a complementary paper ([CITE]).
Key words: instrumentation: adaptive optics
© ESO, 2003
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