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Proceedings Paper

Practical approach to modal basis selection and wavefront estimation
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Paper Abstract

The MPIA/MPE adaptive optics with a laser guide star system ALFA works excellent with natural guide stars up to 13th magnitude in R-band. Using fainter natural guide stars or the extended laser guide star, ALFA's performance does not entirely satisfy our expectations. We describe our efforts in optimizing the wavefront estimation process. Starting with a detailed system analysis, this paper will show how to construct a modal basis set which efficiently uses Shack- Hartmann measurements while keeping a certain number of low order modes close to analytical basis sets like Zernikes or Karhunen-Loeve functions. We will also introduce various phase estimators (least squares, weighted least squares, maximum a posteriori) and show how these can be applied to the ALFA AO. A first test done at the Calar Alto 3.5-m-telescope will be discussed.

Paper Details

Date Published: 7 March 2000
PDF: 8 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 March 2000); doi: 10.1117/12.390345
Show Author Affiliations
Markus E. Kasper, Max-Planck-Institut fuer Astronomie (Germany)
Douglas P. Looze, Univ. of Massachusetts/Amherst (United States)
Stefan Hippler, Max-Planck-Institut fuer Astronomie (Germany)
Markus Feldt, Max-Planck-Institut fuer Astronomie (Germany)
Robert Weiss, Max-Planck-Institut fuer Astronomie (Germany)
Andreas Glindemann, European Southern Observatory (Germany)
Richard I. Davies, Max-Planck-Institut fuer Extraterrestriche Physik (Germany)

Published in SPIE Proceedings Vol. 4007:
Adaptive Optical Systems Technology
Peter L. Wizinowich, Editor(s)

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