Practical approach to modal basis selection and wavefront estimation

Details Practical approach to modal basis selection and wavefront estimation Practical approach to modal basis selection and wavefront estimation

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4007..592k&link_type=abstract

Proc. SPIE Vol. 4007, p. 592-599, Adaptive Optical Systems Technology, Peter L. Wizinowich; Ed.

Physics

Optics

1

Scientific paper

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.

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