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Proceedings Paper

Performance improvements of Shack-Hartmann sensors with keystone design lenslet arrays
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Paper Abstract

Shack-Hartmann based wavefront sensors, used to compensate atmospheric turbulence, appear to be less sensitive than cur-vature based wavefront sensors by more than a magnitude. Besides their read noise free APD detectors and different meas-urement principle, the sensitivity of curvature sensors may benefit from the keystone shaped lenslet geometry which opti-mally balances aperture coverage and illumination of individual subapertures. This paper describes the implementation of a keystone shaped lenslet array for the ALFA Shack-Hartmann based AO system. We compare the novel design with hexago-nal shaped lenslets under different operating conditions such as selected modal basis set and number of compensated modes theoretically and in practice.

Paper Details

Date Published: 7 February 2003
PDF: 6 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.457115
Show Author Affiliations
Markus E. Kasper, Max-Planck-Institut fur Astronomie and European Southern Observatory (Germany)
Stefan Hippler, Max-Planck-Institut fur Astronomie (Germany)

Published in SPIE Proceedings Vol. 4839:
Adaptive Optical System Technologies II
Peter L. Wizinowich; Domenico Bonaccini, Editor(s)

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