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Proceedings Paper

Shack-Hartmann sensor for the active phasing experiment
Author(s): F. Gonte; L. Noethe; C. Araujo; R. Brast; C. Dupuy; C. Frank; F. Derie
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Paper Abstract

The purpose of the Active Phasing Experiment, designed at ESO, is to validate wavefront control concepts for ELT class telescopes. This instrument includes an Active Segmented Mirror, located in a pupil image. It will be mounted at a Nasmyth focus of one of the unit telescopes of the ESO VLT. The Active Phasing Experiment will compare four types of phasing sensor. One of them is based on the Shack-Hartmann principle. The lenslets in the array will be placed on intersegment borders for the measurement of piston steps, as well and inside the subapertures defined by the segments for the measurement of local slopes generated by the segments and the telescope optics. The paper describes the design of the sensor optics and the lenslet array, and discusses the expected performance of the sensor under laboratory conditions and in the telescope.

Paper Details

Date Published: 23 June 2006
PDF: 9 pages
Proc. SPIE 6267, Ground-based and Airborne Telescopes, 626733 (23 June 2006); doi: 10.1117/12.672225
Show Author Affiliations
F. Gonte, European Southern Observatory (Germany)
L. Noethe, European Southern Observatory (Germany)
C. Araujo, European Southern Observatory (Germany)
R. Brast, European Southern Observatory (Germany)
C. Dupuy, European Southern Observatory (Germany)
C. Frank, European Southern Observatory (Germany)
F. Derie, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 6267:
Ground-based and Airborne Telescopes
Larry M. Stepp, Editor(s)

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