On-sky performances of an optical phasing sensor based on a cylindrical lenslet array for segmented telescopes.
2011
New optical phasing sensor technologies have been studied with a test
bench experiment, called Active Phasing Experiment, on-sky at the European Southern
Observatory Very Large Telescope. One of the sensors was of the
Shack–Hartmann type using cylindrical lenslets across the segment borders
for the measurement of the phasing errors. With bright stars, the precision of the
measurement of piston steps at a single border was better than 9 nm wavefront RMS, and the precision of the closed-loop correction of the
piston errors of the segments across the whole mirror was better than 10 nm wavefront RMS. With dimmer stars of magnitude up to 14.5, precisions of
the order of 22 nm wavefront RMS were obtained.
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