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Proceedings Paper

LBT adaptive secondary mirrors: chopping procedures and optical calibration on the test bench
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Paper Abstract

In this paper we will describe the chopping capabilities of the Large Binocular Telescope adaptive secondary mirrors. The chopping testing procedure has been implemented at the Arcetri Test Tower in Florence, Italy, together with the optical testing set-up. The deformable mirror static figuring error, after the flattening calibration at both chopping positions (± 25 μm tilt with respect to the nominal position), is measured to be compatible to the figuring at the zero tilt position, i.e. 30 nm RMS. The figuring error measured at a +25 μm tilted position, while the mirror was chopping at 10Hz, is within requirements for seeing limited mode observations.

Paper Details

Date Published: 13 September 2012
PDF: 7 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 844763 (13 September 2012); doi: 10.1117/12.926818
Show Author Affiliations
Runa Briguglio, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Marco Xompero, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Armando Riccardi, INAF - Osservatorio Astrofisico di Arcetri (Italy)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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