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Proceedings Paper

Beam focusing of a laser guide star
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Paper Abstract

It is foreseen that Extremly large telescope (ELT) will include Adaptive Optics Systems to provide diffraction-limited images in the near infrared. The preliminary atmospheric turbulence properties which affects laser guide star (LGS) generation are presented here. The results of modern model developed in optical communication through atmosphere is used to evaluate LGS size for many different atmospheric situation, with the turbulence intensity concentrate to different heights. This introduce the focusing problem and requirements above the observatory where the adaptive optics system with a reference source will be install. In other case, focus a laser in the mesosphere is impossible in a generic place. In high altitude observatories this is possible, like in canarian observatories. We took 6 experimental turbulence profile to evaluate the beam radius with altitude. A mean value of 0.2 m are found for the diameter of mesospheric volume illuminated by the laser. This is small enough to create an useful LGS for adaptive optics proposes.

Paper Details

Date Published: 7 February 2003
PDF: 9 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.459035
Show Author Affiliations
Sergio Chueca, Instituto de Astrofisica de Canarias (Spain)
Jesus Jimenez Fuensalida, Instituto de Astrofisica de Canarias (Spain)
Marcos Reyes, Instituto de Astrofisica de Canarias (Spain)
Angel Alonso, Instituto de Astrofisica de Canarias (Spain)
Lotti Jochum, Instituto de Astrofisica de Canarias (Spain)

Published in SPIE Proceedings Vol. 4839:
Adaptive Optical System Technologies II
Peter L. Wizinowich; Domenico Bonaccini, Editor(s)

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