Static and predictive tomographic reconstruction for wide-field multi-object adaptive optics systems

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Correia, C (Author) FCUP; Jackson, K (Author) Other; Veran, JP (Author) Other; Andersen, D (Author) Other; Lardiere, O (Author) Other; Bradley, C (Author) Other

Journal

Title: Journal of the Optical Society of America A: Optics and Image Science, and Vision

Vol. 31

Pages: 101-113

ISSN: 1084-7529

Publisher: Optical Society of America

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 24 Citations

Other information

Authenticus ID: P-008-QK9

DOI: 10.1364/josaa.31.000101

Abstract (EN): Multi-object adaptive optics (MOAO) systems are still in their infancy: their complex optical designs for tomographic, wide-field wavefront sensing, coupled with open-loop (OL) correction, make their calibration a challenge. The correction of a discrete number of specific directions in the field allows for streamlined application of a general class of spatio-angular algorithms, initially proposed in Whiteley et al. [J. Opt. Soc. Am. A 15, 2097 (1998)], which is compatible with partial on-line calibration. The recent Learn & Apply algorithm from Vidal et al. [ J. Opt. Soc. Am. A 27, A253 (2010)] can then be reinterpreted in a broader framework of tomographic algorithms and is shown to be a special case that exploits the particulars of OL and aperture-plane phase conjugation. An extension to embed a temporal prediction step to tackle sky-coverage limitations is discussed. The trade-off between lengthening the camera integration period, therefore increasing system lag error, and the resulting improvement in SNR can be shifted to higher guide-star magnitudes by introducing temporal prediction. The derivation of the optimal predictor and a comparison to suboptimal autoregressive models is provided using temporal structure functions. It is shown using end-to-end simulations of Raven, the MOAO science, and technology demonstrator for the 8 m Subaru telescope that prediction allows by itself the use of 1-magnitude-fainter guide stars. (C) 2013 Optical Society of America

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13