13 September 2012 LBT adaptive secondary mirrors: chopping procedures and optical calibration on the test bench
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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.
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Runa Briguglio, Runa Briguglio, Marco Xompero, Marco Xompero, Armando Riccardi, Armando Riccardi, } "LBT adaptive secondary mirrors: chopping procedures and optical calibration on the test bench", Proc. SPIE 8447, Adaptive Optics Systems III, 844763 (13 September 2012); doi: 10.1117/12.926818; https://doi.org/10.1117/12.926818
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