Practical approach to modal basis selection and wavefront estimation

Markus E. Kasper; Douglas P. Looze; Stefan Hippler; Markus Feldt; Robert Weiss; Andreas Glindemann; Richard I. Davies

doi:10.1117/12.390345

7 March 2000 Practical approach to modal basis selection and wavefront estimation

Markus E. Kasper, Douglas P. Looze, Stefan Hippler, Markus Feldt, Robert Weiss, Andreas Glindemann, Richard I. Davies

Proceedings Volume 4007, Adaptive Optical Systems Technology; (2000) https://doi.org/10.1117/12.390345
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

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.

Citation Download Citation

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); https://doi.org/10.1117/12.390345

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