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Proceedings Paper

Concept and performance of multiple laser guide stars for 8-m-class telescopes
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Paper Abstract

In this paper, we describe a concept of multiple laser guide stars system based on tomographic reconstruction and multi- conjugate correction for 8-m class telescopes. We show that this type of adaptive optics (AO) systems can be considered as the next generation of AO systems for 8-m telescopes and represents a necessary intermediate step toward AO systems for Extremely Large Telescopes. Multiple guide stars allow to correct the cone effect which affects single LGS systems and prevents from going to wavelengths shorter than approximately 1 micrometer. With 4 LGS plus 1 NGS, it is expected that correction with a high Strehl can be obtained at least in the R and I bands, with an extended corrected field of view (FOV). An analytic AO model is used to assess the expected on-axis performance. Using recent results on 3D mapping of turbulence (i.e. tomography), we estimate the sky coverage of such a system. We also discuss the implications of a large corrected field of view on the system design: large wavefront sensor field, constrains on the optics and deformable mirrors, and size of the science detector. With an MCAO system, large telescopes would be able to observe faint extragalactic objects and wide crowded fields (2 arcmin) at the diffraction limit.

Paper Details

Date Published: 7 July 2000
PDF: 12 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390328
Show Author Affiliations
Elise Vernet-Viard, European Southern Observatory (Italy)
Norbert N. Hubin, European Southern Observatory (Germany)
Miska Le Louarn, European Southern Observatory (Germany)
Bernard Delabre, European Southern Observatory (Germany)
Guy J. Monnet, European Southern Observatory (Germany)
Andrei A. Tokovinin, European Southern Observatory (Chile)

Published in SPIE Proceedings Vol. 4007:
Adaptive Optical Systems Technology
Peter L. Wizinowich, Editor(s)

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