Physics – Optics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..337g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, p. 337-347
Physics
Optics
40
Adaptive Optics, Atmospheric Effects, Atmospheric Models, Wave Fronts, Signal To Noise Ratios, Spatial Resolution, Telescopes, Temporal Resolution
Scientific paper
The value of adaptive optics (AO) for astronomy no longer needs to be demonstrated. To match the extreme requirements of astromony in terms of resolution and sensitivity requires us to optimize an AO system to a great variety of situations. In particular, this paper addresses the case of low flux levels and shows that the final quality can be improved by adapting the spatial and temporal correction performance of the AO system. The wavefront is considered as a weighted sum of spatial modes. Each mode has an individual behavior characterized by its signal to noise ratio and correlation time. Taking this into account leads us to attribute a specific, optimized correction bandwidth to each mode. To apply this optimization method to a pratical use of adaptive optics, one proposes a scheme where all the required inputs are collected by the AO system itself. The method becomes entirely independent of theoretical assumptions about the turbulence. assumptions about the turbulence.
Gendron Eric
Léna Pierre
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