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Proceedings Paper

Layer oriented adaptive optics: from drawings to metal
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Paper Abstract

In order to get first-hand results in the laboratory and possibly on the sky with the Layer-Oriented approach we designed, built, and tested a bread-board for this type of wavefront sensor. This device consists of a single wavefront sensor able to look simultaneously at four references. The positioning of three of the four reference stars with respect to the central one is made by the means of manually adjustable positioning units. A few additional degrees of freedom have been intentionally placed in the system in a way to test the sensitivity of the unit to misplacement and/or misalignment of some optical components. The laboratory set-up includes a crude system to mimic a telecentric F/32 focal plane illuminated by a number of fiber sources that can be placed in several different configurations. Wavefront deformation can be accomplished by placing some fixed deformating plates optically conjugated to several altitudes on the atmosphere. The system is designed in a way to be easily fitted to the existing AdOpt@TNG system, allowing for multiple references, one DM, closed loop operations. Any preliminar result from this activity will be reported. Laboratory experiments includes checking of the theoretical predictions, especially the effectiveness in sensing up to a certain spatial frequency the layers not specifically conjugated to the detector. The results of a demonstrative experiment, showing how the wavefront sensor is able to disentangle layers contribution, are also reported.

Paper Details

Date Published: 7 February 2003
PDF: 12 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.459031
Show Author Affiliations
Jacopo Farinato, Osservatorio Astrofisico di Arcetri (Italy)
Roberto Ragazzoni, Osservatorio Astrofisico di Arcetri and Max-Planck-Institut fur Astronomie (Italy)
Emiliano Diolaiti, Osservatorio Astronomico di Padova (Italy)
Elise Vernet-Viard, Osservatorio Astrofisico di Arcetri (Italy)
Andrea Baruffolo, Osservatorio Astronomico di Padova (Italy)
Carmelo Arcidiacono, Univ. degli Studi di Firenze (Italy)
Adriano Ghedina, Ctr. Galileo Galilei (Spain)
Massimo Cecconi, Ctr. Galileo Galilei (Spain)
Pierfrancesco Rossettini, Studio Tecnico Tomelleri s.a.s. (Italy)
Raffaele Tomelleri, Studio Tecnico Tomelleri s.a.s. (Italy)
Giuseppe Crimi, Osservatorio Astronomico di Brera (Italy)
Mauro Ghigo, Osservatorio Astronomico di Brera (Italy)

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

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