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Spatial frequency domain model for adaptive optics compensation of segmented mirror misalignments and figure errors

Ellerbroek, Brent L. (2006) Spatial frequency domain model for adaptive optics compensation of segmented mirror misalignments and figure errors. In: Advances in Adaptive Optics II. Proceedings of SPIE. No.6272. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 62724K. ISBN 9780819463371. http://resolver.caltech.edu/CaltechAUTHORS:20190521-093547162

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Abstract

In addition to their essential function of providing atmospheric turbulence compensation, astronomical Adaptive Optical (AO) systems also supplement the role of active optics (aO) by providing some additional correction of the wavefront aberrations introduced by mirror mounting, alignment, thermal distortion and/or fabrication errors. This feature is particularly desirable for segmented mirror telescopes such as the Thirty Meter Telescope (TMT), but wavefront discontinuities across segment boundaries are challenging to properly sense and correct. In this paper we describe a fast, analytical, frequency domain model which may be used to study and quantify the above effects, and discuss a range of sample results obtained to support the development of the top-level requirements for the TMT primary mirror. In general, AO compensation of mirror segment piston errors is not particulary useful unless the deformable mirror (DM) interactuator spacing is equivalent to no more than one-half of a mirror segment diameter (when both of these dimensions are expressed in the same pupil plane). Effective AO compensation of mirror segment tip/tilt errors, or low order segment figure errors such as astigmatism, typically requires 3-4 DM actuators per mirror segment. These results illustrate the importance of quantifying and minimizing uncorrectable telescope wavefront errors when developing performance predictions for adaptive optical systems.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.669312DOIArticle
Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). The author gratefully acknowledges the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the Association of Universities for Research in Astronomy (AURA), the California Institute of Technology and the University of California. This work was supported, as well, by the Canada Foundation for Innovation, the Gordon and Betty Moore Foundation, the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation, the Ontario Ministry of Research and Innovation, and the National Research Council of Canada.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
CaltechUNSPECIFIED
University of CaliforniaUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
National Optical Astronomy Observatory (NOAO)UNSPECIFIED
NSFUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Subject Keywords:Adaptive Optics, Extremely Large Telescopes, Segmented Mirrors
Record Number:CaltechAUTHORS:20190521-093547162
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190521-093547162
Official Citation:Brent L. Ellerbroek "Spatial frequency domain model for adaptive optics compensation of segmented mirror misalignments and figure errors", Proc. SPIE 6272, Advances in Adaptive Optics II, 62724K (27 June 2006); doi: 10.1117/12.669312; https://doi.org/10.1117/12.669312
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95634
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 May 2019 17:45
Last Modified:21 May 2019 17:45

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