18 July 2014 Metrology of flat mirrors with a computer generated hologram
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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, Giorgio Pariani, Daniela Tresoldi, Daniela Tresoldi, Manuele Moschetti, Manuele Moschetti, Marco Riva, Marco Riva, Andrea Bianco, Andrea Bianco, Filippo Maria Zerbi, 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); doi: 10.1117/12.2055814; https://doi.org/10.1117/12.2055814
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