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7 February 2003 Performance improvements of Shack-Hartmann sensors with keystone design lenslet arrays
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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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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