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Proceedings Paper

Radetzky: a new, large grazing incidence interferometer for large plane surface testing
Author(s): Emilio Molinari; Paolo Spanò; Giorgio Toso; Daniela Tresoldi; Roberto Biasi; Jean-Louis Carel; Daniele Gallieni
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Paper Abstract

The ability to manufacture larger adaptive optics mirror rely also on the availability of metrology tools suitable for the purpose to validate the mirrors. In the framework of the ELT M4 adaptive, 2.5 m diameter, plane mirror we devised a series of tools able to certify that the plane wavefront is achieved and kept in place. A stitching series of small beams is conjugated with a whole image of the mirror thanks to a big, grazing incidence interferometric cavity. The set is completed by a novel piston sensing device which collate different segments of the (possibly) multiple mirror. We describe here the foreseen procedure and the status of the prototype realization.

Paper Details

Date Published: 14 July 2008
PDF: 9 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70153O (14 July 2008); doi: 10.1117/12.788835
Show Author Affiliations
Emilio Molinari, INAF – Osservatorio di Brera (Italy)
Paolo Spanò, INAF – Osservatorio di Brera (Italy)
Giorgio Toso, INAF – Osservatorio di Brera (Italy)
Daniela Tresoldi, INAF – Osservatorio di Brera (Italy)
Roberto Biasi, Microgate (Italy)
Jean-Louis Carel, Sagem (France)
Daniele Gallieni, ADS International (Italy)


Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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