Share Email Print

Proceedings Paper

AOF LTAO mode: reconstruction strategy and first test results
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

GALACSI is the Adaptive Optics (AO) system serving the instrument MUSE in the framework of the Adaptive Optics Facility (AOF) project. Its Narrow Field Mode (NFM) is a Laser Tomography AO (LTAO) mode delivering high resolution in the visible across a small Field of View (FoV) of 7.5" diameter around the optical axis. From a reconstruction standpoint, GALACSI NFM intends to optimize the correction on axis by estimating the turbulence in volume via a tomographic process, then projecting the turbulence profile onto one single Deformable Mirror (DM) located in the pupil, close to the ground.

In this paper, the laser tomographic reconstruction process is described. Several methods (virtual DM, virtual layer projection) are studied, under the constraint of a single matrix vector multiplication. The pseudo-synthetic interaction matrix model and the LTAO reconstructor design are analysed. Moreover, the reconstruction parameter space is explored, in particular the regularization terms.

Furthermore, we present here the strategy to define the modal control basis and split the reconstruction between the Low Order (LO) loop and the High Order (HO) loop. Finally, closed loop performance obtained with a 3D turbulence generator will be analysed with respect to the most relevant system parameters to be tuned.

Paper Details

Date Published: 26 July 2016
PDF: 20 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99091U (26 July 2016); doi: 10.1117/12.2233396
Show Author Affiliations
Sylvain Oberti, European Southern Observatory (Germany)
Johann Kolb, European Southern Observatory (Germany)
Miska Le Louarn, European Southern Observatory (Germany)
Paolo La Penna, European Southern Observatory (Germany)
Pierre-Yves Madec, European Southern Observatory (Germany)
Benoit Neichel, Aix Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
Jean-François Sauvage, ONERA (France)
Thierry Fusco, Aix Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
ONERA (France)
Robert Donaldson, European Southern Observatory (Germany)
Christian Soenke, European Southern Observatory (Germany)
Marcos Suárez Valles, European Southern Observatory (Germany)
Robin Arsenault, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?