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Optimizing multi-LGS WFS AO performance in the context of sodium profile evolution and non-common path aberration

Wang, Lianqi and Ellerbroek, Brent and Herriot, Glen and Véran, Jean-Pierre and Boyer, Corinne (2018) Optimizing multi-LGS WFS AO performance in the context of sodium profile evolution and non-common path aberration. In: Adaptive Optics Systems VI. Proceedings of SPIE. No.10703. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107032B. ISBN 9781510619593. http://resolver.caltech.edu/CaltechAUTHORS:20190109-073239030

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Abstract

For Extremely Large Telescope (ELT) adaptive optics (AO) systems, multiple Sodium Laser Guide Star (LGS) wavefront sensors (WFSs) are required to achieve high sky coverage and diffraction limited performance. However, temporal and spatial variation of the sodium profile causes measurement biases that appear at all time scales and vary between LGS WFSs. To make things worse, optical design residuals, polishing and alignment errors also create non-common-path aberrations (NCPA) that vary between sub-apertures and different WFS, causing LGS WFS to work significantly off null with a nonlinear response. The induced aberrations are consequently non-radially symmetric, even for center launch laser beams with polar coordinate detectors. Natural guide star (NGS) based truth wavefront sensors are often suggested as a method of sensing these LGS WFS aberrations, but a single sensor will suffer strong anisoplanatism that may introduce additional errors. In this paper, we present mitigation strategies and performance estimations based on simulations for the Thirty Meter Telescope (TMT) Narrow Field Infrared AO system (NFIRAOS).


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2312873DOIArticle
Additional Information:© 2018 Society of Photo-optical Instrumentation Engineers (SPIE).
Group:Thirty Meter Telescope
Record Number:CaltechAUTHORS:20190109-073239030
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190109-073239030
Official Citation:Lianqi Wang, Brent Ellerbroek, Glen Herriot, Jean-Pierre Véran, Corinne Boyer, "Optimizing multi-LGS WFS AO performance in the context of sodium profile evolution and non-common path aberration," Proc. SPIE 10703, Adaptive Optics Systems VI, 107032B (10 July 2018); doi: 10.1117/12.2312873
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92151
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Jan 2019 18:22
Last Modified:09 Jan 2019 18:22

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