Concept for a laser guide beacon Shack-Hartmann wave-front sensor with dynamically steered subapertures |
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Authors: | Baranec Christoph J Bauman Brian J Lloyd-Hart Michael |
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Institution: | Center for Astronomical Adaptive Optics, University of Arizona, Tucson, Arizona 85721, USA. baranec@as.arizona.edu |
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Abstract: | We describe an innovative implementation of the Shack-Hartmann wave-front sensor that is designed to correct the perspective elongation of a laser guide beacon in adaptive optics. Subapertures are defined by the segments of a deformable mirror rather than by a conventional lenslet array. A bias tilt on each segment separates the beacon images on the sensor's detector. One removes the perspective elongation by dynamically driving each segment with a predetermined open-loop signal that would, in the absence of atmospheric wave-front aberration, keep the corresponding beacon image centered on the subaperture's optical axis. |
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