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Optics Letters

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  • Vol. 36, Iss. 20 — Oct. 15, 2011
  • pp: 4071–4073

Differential focal anisoplanatism in laser guide star wavefront sensing on extremely large telescopes

Nicolas Muller, Vincent Michau, Clélia Robert, and Gérard Rousset  »View Author Affiliations


Optics Letters, Vol. 36, Issue 20, pp. 4071-4073 (2011)
http://dx.doi.org/10.1364/OL.36.004071


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Abstract

Laser guide stars (LGSs) aim at increasing the sky coverage of adaptive optics (AO) as this is highly restricted when using only natural guide stars. With such three-dimensional extended objects, spot elongation may limit the measurement accuracy of wavefronts. We evaluate the effect of differential focal anisoplanatism, induced solely by the longitudinal extension of a side-launched LGS, on the slope measurements performed by a Shack–Hartmann for a 40 m class telescope. We also take this effect into account in the wavefront reconstruction and derive estimations of the resulting wavefront error in a multi-LGS AO system. We find an error of 100 nm in the worst case at the subaperture level and a small error of the order of 10 nm for six LGSs after wavefront reconstruction.

© 2011 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(010.7350) Atmospheric and oceanic optics : Wave-front sensing

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: May 20, 2011
Revised Manuscript: September 16, 2011
Manuscript Accepted: September 16, 2011
Published: October 12, 2011

Citation
Nicolas Muller, Vincent Michau, Clélia Robert, and Gérard Rousset, "Differential focal anisoplanatism in laser guide star wavefront sensing on extremely large telescopes," Opt. Lett. 36, 4071-4073 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-20-4071


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