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Proceedings Paper

Metrology of flat mirrors with a computer generated hologram
Author(s): Giorgio Pariani; Daniela Tresoldi; Manuele Moschetti; Marco Riva; Andrea Bianco; Filippo Maria Zerbi
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Paper Abstract

We designed the interferometric test of a 300 mm flat mirror, based onto a spherical mirror and a dedicated CGH. The spherical beam of the interferometer is quasi collimated to the desired diameter by the spherical mirror, used slightly off-axis, and the CGH performs the residual wavefront correction. We performed tests on a 200 mm and 300 mm flat mirrors, and compared the results to the ones obtained by stitching, showing an accuracy well within the designed value. The possibility to calibrate the cavity by subtracting out the figure errors of the spherical mirror has also been evaluated.

Paper Details

Date Published: 18 July 2014
PDF: 11 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91510Y (18 July 2014); doi: 10.1117/12.2055814
Show Author Affiliations
Giorgio Pariani, INAF - Osservatorio Astronomico di Brera (Italy)
Daniela Tresoldi, INAF - IASF Milano (Italy)
Manuele Moschetti, INAF - Osservatorio Astronomico di Brera (Italy)
Marco Riva, INAF - Osservatorio Astronomico di Brera (Italy)
Andrea Bianco, INAF - Osservatorio Astronomico di Brera (Italy)
Filippo Maria Zerbi, INAF - Osservatorio Astronomico di Brera (Italy)


Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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