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Increased sky coverage with optimal correction of tilt and tilt-anisoplanatism modes in laser-guide-star multiconjugate adaptive optics

Correia, Carlos and Véran, Jean-Pierre and Herriot, Glen and Ellerbroek, Brent and Wang, Lianqi and Gilles, Luc (2013) Increased sky coverage with optimal correction of tilt and tilt-anisoplanatism modes in laser-guide-star multiconjugate adaptive optics. Journal of the Optical Society of America A, 30 (4). pp. 604-615. ISSN 1084-7529. https://resolver.caltech.edu/CaltechAUTHORS:20130607-095310325

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Abstract

Laser-guide-star multiconjugate adaptive optics (MCAO) systems require natural guide stars (NGS) to measure tilt and tilt-anisoplanatism modes. Making optimal use of the limited number of photons coming from such, generally dim, sources is mandatory to obtain reasonable sky coverage, i.e., the probability of finding asterisms amenable to NGS wavefront (WF) sensing for a predefined WF error budget. This paper presents a Strehl-optimal (minimum residual variance) spatiotemporal reconstructor merging principles of modal atmospheric tomography and optimal stochastic control theory. Simulations of NFIRAOS, the first light MCAO system for the thirty-meter telescope, using ∼500 typical NGS asterisms, show that the minimum-variance (MV) controller delivers outstanding results, in particular for cases with relatively dim stars (down to magnitude 22 in the H-band), for which low-temporal frame rates (as low as 16 Hz) are required to integrate enough flux. Over all the cases tested ∼21  nm  rms median improvement in WF error can be achieved with the MV compared to the current baseline, a type-II controller based on a double integrator. This means that for a given level of tolerable residual WF error, the sky coverage is increased by roughly 10%, a quite significant figure. The improvement goes up to more than 20% when compared with a traditional single-integrator controller.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1364/JOSAA.30.000604DOIUNSPECIFIED
http://www.opticsinfobase.org/josaa/abstract.cfm?uri=josaa-30-4-604PublisherUNSPECIFIED
ORCID:
AuthorORCID
Wang, Lianqi0000-0002-9803-166X
Additional Information:© 2013 Optical Society of America. Received December 6, 2012; revised January 25, 2013; accepted January 25, 2013; posted January 29, 2013 (Doc. ID 181273); published March 11, 2013. The authors thank Caroline Kulcsár and Henri-François Raynaud for fruitful discussions regarding the upsampled MV controller.
Issue or Number:4
Classification Code:OCIS codes: 010.1080, 000.5490, 110.6960
Record Number:CaltechAUTHORS:20130607-095310325
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130607-095310325
Official Citation:Carlos Correia, Jean-Pierre Véran, Glen Herriot, Brent Ellerbroek, Lianqi Wang, and Luc Gilles, "Increased sky coverage with optimal correction of tilt and tilt-anisoplanatism modes in laser-guide-star multiconjugate adaptive optics," J. Opt. Soc. Am. A 30, 604-615 (2013) http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-30-4-604
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38852
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:25 Jun 2013 19:50
Last Modified:09 Mar 2020 13:19

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