Abstract

We present the results of the co-phasing closed loop performed with a pyramid wavefront sensor for what we believe to be the first time in the presence of emulated atmospheric disturbance. The performance of the co-phasing loop is significantly improved by applying two spatial filters in the sensor signal space. The first is a zonal filter applied to the interaction matrix before the computation of the reconstructor; the second is a modal filter applied to the sensor signals before the correction command computation. The presented laboratory results demonstrate that, applying both filters, the time requested to average out the atmospheric disturbance in each loop step is reduced by 2 orders of magnitude, improving the loop stability and accuracy.

© 2007 Optical Society of America

Pyramid sensor for segmented mirror alignment

S. Esposito, E. Pinna, A. Puglisi, A. Tozzi, and P. Stefanini
Opt. Lett. 30(19) 2572-2574 (2005)

On-sky performance of the Zernike phase contrast sensor for the phasing of segmented telescopes

Isabelle Surdej, Natalia Yaitskova, and Frederic Gonte
Appl. Opt. 49(21) 4052-4062 (2010)

Comparison between a model-based and a conventional pyramid sensor reconstructor

Visa Korkiakoski, Christophe Vérinaud, Miska Le Louarn, and Rodolphe Conan
Appl. Opt. 46(24) 6176-6184 (2007)

On-sky multiwavelength phasing of segmented telescopes with the Zernike phase contrast sensor

Arthur Vigan, Kjetil Dohlen, and Silvio Mazzanti
Appl. Opt. 50(17) 2708-2718 (2011)

Performance study of Kalman filter controller for multiconjugate adaptive optics

Piotr Piatrou and Michael C. Roggemann
Appl. Opt. 46(9) 1446-1455 (2007)