Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000exa....10...49k&link_type=abstract
Experimental Astronomy, v. 10, Issue 1, p. 49-73 (2000).
Astronomy and Astrophysics
Astronomy
15
Scientific paper
The adaptive optics system ALFA differs in some aspects from systems like ADONIS and PUEO which have delivered scientific results since years. Interchangeable lenslet arrays with different numbers of subapertures and a deformable mirror with many more actuators than the number of corrected modes result in some peculiarities in the calibration of the system and the reconstruction of incident wavefronts. We describe the design of ALFA's optics and its modal control architecture with a focus on a comparative study of the performance of different mode sets used to correct the wavefront aberrations. An outlook on our plans to improve and simplify the use of ALFA is given. The last section is dedicated to issues related to observing with ALFA in its present state. Expected Strehl ratios for different seeing conditions and guide star magnitudes are summarized in a table. AO observations in general, direct imaging and doing spectroscopy with ALFA in particular are discussed.
Glindemann Andreas
Herbst Tom
Hippler Stefan
Kasper Marcus
Looze Douglas P.
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