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7 March 2000 Practical approach to modal basis selection and wavefront estimation
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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.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Markus E. Kasper, Douglas P. Looze, Stefan Hippler, Markus Feldt, Robert Weiss, Andreas Glindemann, and Richard I. Davies "Practical approach to modal basis selection and wavefront estimation", Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 March 2000);


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