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Proceedings Paper

Multiconjugate adaptive optics: experiments in atmospheric tomography
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Paper Abstract

In 1987 I described a technique call Multi-Conjugate Adaptive Optics (MCAO) as a way of increasing the size of the area on the sky over which Adaptive Optics corrects for atmospheric wavefront distortions. An essential component of MCAO is the estimation of this wavefront distortion at different heights in the atmosphere. The technique proposed to do so was called 'Atmospheric Tomography,' or AT, since it uses tomographic techniques using the wavefront distortions at the telescope entrance pupil of objects observed in a number of different directions in the sky to infer the 3-D wavefront behavior. This paper describes a program to do so using the small scale structure on the solar surface (sunspots, pores and granulation). The Sun has the advantage of being an extended object on which the wavefront can be observed in a large number of directions using correlation Hartmann-Shack wavefront sensing. The AT experiment described in this paper uses the 76 cm Dunn Solar Telescope at NSO, 69 sub-apertures, a 2 X 2 arcmin2 field-of-view and a wavelength of 411 nm. The MCAO-AT system is being developed for the future 4 meter aperture Advanced Solar Telescope.

Paper Details

Date Published: 7 July 2000
PDF: 10 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390312
Show Author Affiliations
Jacques Maurice Beckers, National Solar Observatory (United States)

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

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