13 September 2012 Optical calibration and testing of the E-ELT M4 adaptive mirror
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Abstract
Innovative optical interferometry test setups and control software techniques have been proposed for the E-ELT M4 adaptive optics mirror. The system is composed of three sub-systems: a CGH-based optical test tower, delivering a 1.5- m collimated beam, for fast simultaneous acquisition of large areas; a stitching interferometer, to calibrate at higher spatial frequencies, on smaller areas; and an optical piston sensor to remove differential piston and tilt between adjacent mirror segments.
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P. Spanò, P. Spanò, A. Bianco, A. Bianco, R. Briguglio, R. Briguglio, M. Cecconi, M. Cecconi, L. Miglietta, L. Miglietta, E. Molinari, E. Molinari, G. Pariani, G. Pariani, A. Riccardi, A. Riccardi, M. Riva, M. Riva, D. Tresoldi, D. Tresoldi, M. Xompero, M. Xompero, F. Zerbi, F. Zerbi, } "Optical calibration and testing of the E-ELT M4 adaptive mirror", Proc. SPIE 8447, Adaptive Optics Systems III, 84473O (13 September 2012); doi: 10.1117/12.926008; https://doi.org/10.1117/12.926008
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