Natural guide-star processing for wide-field laser-assisted AO systems

• Type: Article in International Conference Proceedings Book
• Date: 2016

Authors

Correia, CM (Author) Other; Neichel, B (Author) Other; Conan, JM (Author) Other; Petit, C (Author) Other; Sauvage, JF (Author) Other; Fusco, T (Author) Other; Vernet, JDR (Author) Other; Thatte, N (Author) Other

Conference proceedings International

Title: ADAPTIVE OPTICS SYSTEMS V

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-014-ZCR

DOI: 10.1117/12.2232918

Abstract (EN): Sky-coverage in laser-Assisted AO observations largely depends on the system's capability to guide on the faintest natural guide-stars possible. Here we give an up-To-date status of our natural guide-star processing tailored to the European-ELT's visible and near-infrared (0.47 to 2.45 ¿m) integral field spectrograph-Harmoni. We tour the processing of both the isoplanatic and anisoplanatic tilt modes using the spatio-Angular approach whereby the wavefront is estimated directly in the pupil plane avoiding a cumbersome explicit layered estimation on the 35-layer profiles we're currently using. Taking the case of Harmoni, we cover the choice of wave-front sensors, the number and field location of guide-stars, the optimised algorithms to beat down angular anisoplanatism and the performance obtained with different temporal controllers under split high-order/low-order tomography or joint tomography. We consider both atmospheric and far greater telescope wind buffeting disturbances. In addition we provide the sky-coverage estimates thus obtained.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13