22 July 2014 Approaches to the interferometric test of large flat mirrors: the case of the adaptive M4 for E-ELT
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A particular example of meter class flat mirrors is the adaptive M4 Unit of E-ELT, a deformable six petals mirror of 2.4m in diameter. We studied different approaches to the calibration and certification of M4, in a trade-off between stitching and full aperture measurements. Possibilities to test the mirror with a macro-stitching concept, both in normal and grazing incidence have been considered. Approaches reported in the literature, as the Ritchey-Common or the external Fizeau, and different beam expander setups, varying the collimating mirror and the nulling system, both on-axis and off-axis, have been deeply studied to understand performances and sensitivities to fabrication errors, alignment errors and environmental effects.
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Giorgio Pariani, Giorgio Pariani, Runa Briguglio, Runa Briguglio, Marco Xompero, Marco Xompero, Armando Riccardi, Armando Riccardi, Marco Riva, Marco Riva, Andrea Bianco, Andrea Bianco, Filippo M. Zerbi, Filippo M. Zerbi, Daniela Tresoldi, Daniela Tresoldi, Emilio Molinari, Emilio Molinari, Matteo Tintori, Matteo Tintori, Paolo Lazzarini, Paolo Lazzarini, Daniele Gallieni, Daniele Gallieni, Roberto Biasi, Roberto Biasi, Elise Vernet, Elise Vernet, Marc Cayrel, Marc Cayrel, } "Approaches to the interferometric test of large flat mirrors: the case of the adaptive M4 for E-ELT", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91453B (22 July 2014); doi: 10.1117/12.2055909; https://doi.org/10.1117/12.2055909

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