On how to gain 60nm RMS (for the instrument METIS) in AO control

Andreas Obereder; Thomas Bertram; Carlos Correia; Markus Feldt; Stefan Raffetseder; Horst Steuer; Bernadett Stadler

doi:10.1117/12.3019620

28 August 2024 On how to gain 60nm RMS (for the instrument METIS) in AO control

Andreas Obereder, Thomas Bertram, Carlos Correia, Markus Feldt, Stefan Raffetseder, Horst Steuer, Bernadett Stadler

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130977V (2024) https://doi.org/10.1117/12.3019620
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

For the AO Control of the ELT instrument METIS a two-step method has been developed. First, we reconstruct the incoming wavefront from modulated Pyramid WFS measurements, second, we project this wavefront estimation on a set of modes defined on the M4 of the ELT. Here we focus on the second step, the stable fitting step of a wavefront on modes. We introduce a regularized fitting step on M4 (and subsequently all available modes without truncation) based on the same statistical information as the wavefront reconstructor. In the context of the instrument METIS we gain up to 60nm RMS and a stable performance of the AO system over all seeing and flux conditions studied.

Citation Download Citation

Andreas Obereder, Thomas Bertram, Carlos Correia, Markus Feldt, Stefan Raffetseder, Horst Steuer, and Bernadett Stadler "On how to gain 60nm RMS (for the instrument METIS) in AO control", Proc. SPIE 13097, Adaptive Optics Systems IX, 130977V (28 August 2024); https://doi.org/10.1117/12.3019620

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