Metrology of flat mirrors with a computer generated hologram

Giorgio Pariani; Daniela Tresoldi; Manuele Moschetti; Marco Riva; Andrea Bianco; Filippo Maria Zerbi

doi:10.1117/12.2055814

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18 July 2014 Metrology of flat mirrors with a computer generated hologram

Giorgio Pariani, Daniela Tresoldi, Manuele Moschetti, Marco Riva, Andrea Bianco, Filippo Maria Zerbi

Author Affiliations +

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91510Y (2014) https://doi.org/10.1117/12.2055814
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

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Giorgio Pariani, Daniela Tresoldi, Manuele Moschetti, Marco Riva, Andrea Bianco, and Filippo Maria Zerbi "Metrology of flat mirrors with a computer generated hologram", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91510Y (18 July 2014); https://doi.org/10.1117/12.2055814

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