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

Markus E. Kasper; Stefan Hippler

doi:10.1117/12.457115

7 February 2003 Performance improvements of Shack-Hartmann sensors with keystone design lenslet arrays

Markus E. Kasper, Stefan Hippler

Proceedings Volume 4839, Adaptive Optical System Technologies II; (2003) https://doi.org/10.1117/12.457115
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

Citation Download Citation

Markus E. Kasper and Stefan Hippler "Performance improvements of Shack-Hartmann sensors with keystone design lenslet arrays", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); https://doi.org/10.1117/12.457115

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