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Proceedings Paper

An active wavefront sensor to make feasible adaptive optics on 100-m class telescopes
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Paper Abstract

Layer Oriented wavefront sensors can be made with a reasonable compact detector by the adoption of several stars enlargers, increasing only locally the focal ratio on the reference stars. The main opto-mechanical requirement in this kind of device is represented by the tolerances in tip and tilt of these star enlargers, which have to be moved over the Field Of View and aligned with the reference stars. A differential tip-tilt among the star enlargers leads to a mismatch between the different pupil images related to the reference stars. This misalignment eventually translates into a blurring of the measured wavefront, reducing the sensing quality. We describe a conceptual layout for an active control of the wavefront sensor, in order to reach the best mechanical positioning of these stars enlargers. In particular we discuss an algorithm to determine the effective pupils positions by simple movements and apply the requested displacement through commercially available piezoelectric actuators, shown in a preliminary opto-mechancial design of such wavefront sensor.

Paper Details

Date Published: 7 July 2004
PDF: 7 pages
Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); doi: 10.1117/12.566271
Show Author Affiliations
Marco Xompero, Univ. degli Studi di Padova (Italy)
Carmelo Arcidiacono, Univ. degli Studi di Firenze (Italy)
Roberto Ragazzoni, Osservatorio Astrofisico di Arcetri (Italy)
Max-Planck-Institut für Astronomie (Germany)
Elise Vernet, Osservatorio Astrofisico di Arcetri (Italy)

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

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