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