title: Concept for a laser guide beacon Shack-Hartmann wave-front sensor with dynamically steered subapertures.
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.
authors.affiliation: Center for Astronomical Adaptive Optics, University of Arizona, Tucson, Arizona 85721, USA. baranec@as.arizona.edu
authors.forename: Christoph J
authors.initials: CJ
authors.lastname: Baranec
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Bauman
authors.forename: Michael
authors.initials: M
authors.lastname: Lloyd-Hart