AOF LTAO mode: reconstruction strategy and first test results

Sylvain Oberti; Johann Kolb; Miska Le Louarn; Paolo La Penna; Pierre-Yves Madec; Benoit Neichel; Jean-François Sauvage; Thierry Fusco; Robert Donaldson; Christian Soenke; Marcos Suárez Valles; Robin Arsenault

doi:10.1117/12.2233396

26 July 2016 AOF LTAO mode: reconstruction strategy and first test results

Sylvain Oberti, Johann Kolb, Miska Le Louarn, Paolo La Penna, Pierre-Yves Madec, Benoit Neichel, Jean-François Sauvage, Thierry Fusco, Robert Donaldson, Christian Soenke, Marcos Suárez Valles, Robin Arsenault

Author Affiliations +

Proceedings Volume 9909, Adaptive Optics Systems V; 99091U (2016) https://doi.org/10.1117/12.2233396
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

Citation Download Citation

Sylvain Oberti, Johann Kolb, Miska Le Louarn, Paolo La Penna, Pierre-Yves Madec, Benoit Neichel, Jean-François Sauvage, Thierry Fusco, Robert Donaldson, Christian Soenke, Marcos Suárez Valles, and Robin Arsenault "AOF LTAO mode: reconstruction strategy and first test results", Proc. SPIE 9909, Adaptive Optics Systems V, 99091U (26 July 2016); https://doi.org/10.1117/12.2233396

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available