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PIGS on sky - dream or reality?
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Paper Abstract

Since several problems of Laser Guide Stars, like conical anisoplanatism, perspective elongation, etc., scales with the telescope diameter, the use of artificial stars will become more difficult with apertures in the range of ELTs. Problems with Laser Guide Stars are reviewed and a way is shown how to overcome most of these difficulties with the concept of Pseudo Infinity Guide Stars (PIGS). A new kind of wavefront sensor is introduced taking advantage of the concept by the means of two optical devices, a reflecting rod and a mask. We explain this novel wavefront sensor, show results of a laboratory experiment, and conclude in further steps to apply the concept with full MCAO capability.

Paper Details

Date Published: 7 July 2004
PDF: 6 pages
Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); doi: 10.1117/12.566234
Show Author Affiliations
Stephan Kellner, Max-Planck-Institut fur Astronomie (Germany)
Roberto Ragazzoni, Max-Planck-Institut fur Astronomie (Germany)
INAF-Osservatorio Astrofisico di Arcetri (Italy)
Wolfgang Gassler, Max-Planck-Institut fur Astronomie (Germany)
Emiliano Diolaiti, Univ. degli Studi di Padova (Italy)
Jacopo Farinato, Max-Planck-Institut fur Astronomie (Germany)
INAF-Osservatorio Astrofisico di Arcetri (Italy)
Carmelo Arcidiacono, Univ. degli Studi di Firenze (Italy)
Richard M. Myers, Univ. of Durham (United Kingdom)
Tim J. Morris, Univ. of Durham (United Kingdom)
Adriano Ghedina, Telescopo Nazionale Galileo (Spain)

Published in SPIE Proceedings Vol. 5382:
Second Backaskog Workshop on Extremely Large Telescopes
Arne L. Ardeberg; Torben Andersen, Editor(s)

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