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Proceedings Paper

Testing large flats with computer generated holograms
Author(s): Giorgio Pariani; Daniela Tresoldi; Paolo Spanò; Andrea Bianco
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Paper Abstract

We describe the optical test of a large flat based on a spherical mirror and a dedicated CGH. The spherical mirror, which can be accurately manufactured and tested in absolute way, allows to obtain a quasi collimated light beam, and the hologram performs the residual wavefront correction. Alignment tools for the spherical mirror and the hologram itself are encoded in the CGH. Sensitivity to fabrication errors and alignment has been evaluated. Tests to verify the effectiveness of our approach are now under execution.

Paper Details

Date Published: 13 September 2012
PDF: 8 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84500Z (13 September 2012); doi: 10.1117/12.927064
Show Author Affiliations
Giorgio Pariani, Politecnico di Milano (Italy)
INAF - Osservatorio Astronomico di Brera (Italy)
Daniela Tresoldi, INAF - Osservatorio Astronomico di Brera (Italy)
Paolo Spanò, INAF - Osservatorio Astronomico di Brera (Italy)
NRC-Herzberg Institute of Astrophysics (Canada)
Andrea Bianco, INAF - Osservatorio Astronomico di Brera (Italy)


Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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