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Proceedings Paper

Approaches to the interferometric test of large flat mirrors: the case of the adaptive M4 for E-ELT
Author(s): Giorgio Pariani; Runa Briguglio; Marco Xompero; Armando Riccardi; Marco Riva; Andrea Bianco; Filippo M. Zerbi; Daniela Tresoldi; Emilio Molinari; Matteo Tintori; Paolo Lazzarini; Daniele Gallieni; Roberto Biasi; Elise Vernet; Marc Cayrel
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Paper Abstract

A particular example of meter class flat mirrors is the adaptive M4 Unit of E-ELT, a deformable six petals mirror of 2.4m in diameter. We studied different approaches to the calibration and certification of M4, in a trade-off between stitching and full aperture measurements. Possibilities to test the mirror with a macro-stitching concept, both in normal and grazing incidence have been considered. Approaches reported in the literature, as the Ritchey-Common or the external Fizeau, and different beam expander setups, varying the collimating mirror and the nulling system, both on-axis and off-axis, have been deeply studied to understand performances and sensitivities to fabrication errors, alignment errors and environmental effects.

Paper Details

Date Published: 22 July 2014
PDF: 8 pages
Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91453B (22 July 2014); doi: 10.1117/12.2055909
Show Author Affiliations
Giorgio Pariani, INAF - Osservatorio Astronomico di Brera (Italy)
Runa Briguglio, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Marco Xompero, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Armando Riccardi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Marco Riva, INAF - Osservatorio Astronomico di Brera (Italy)
Andrea Bianco, INAF - Osservatorio Astronomico di Brera (Italy)
Filippo M. Zerbi, INAF - Osservatorio Astronomico di Brera (Italy)
Daniela Tresoldi, INAF - IASF Milano (Italy)
Emilio Molinari, INAF - Fundación Galileo Galilei (Spain)
Matteo Tintori, A.D.S. International S.r.l. (Italy)
Paolo Lazzarini, A.D.S. International S.r.l. (Italy)
Daniele Gallieni, A.D.S. International S.r.l. (Italy)
Roberto Biasi, Microgate (Italy)
Elise Vernet, European Southern Observatory (Germany)
Marc Cayrel, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 9145:
Ground-based and Airborne Telescopes V
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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