Open AccessShack-Hartmann wavefront sensing based on binary-aberration-mode filtering
Author(s) -
Shuai Wang,
Ping Yang,
Bing Xu,
Lizhi Dong,
Mingwu Ao
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.005052
Subject(s) - wavefront sensor , wavefront , optics , centroid , adaptive optics , physics , detector , binary number , pixel , noise (video) , microlens , computer science , artificial intelligence , lens (geology) , image (mathematics) , mathematics , arithmetic
Spot centroid detection is required by Shack-Hartmann wavefront sensing since the technique was first proposed. For a Shack-Hartmann wavefront sensor, the standard structure is to place a camera behind a lenslet array to record the image of spots. We proposed a new Shack-Hartmann wavefront sensing technique without using spot centroid detection. Based on the principle of binary-aberration-mode filtering, for each subaperture, only one light-detecting unit is used to measure the local wavefront slopes. It is possible to adopt single detectors in Shack-Hartmann wavefront sensor. Thereby, the method is able to gain noise benefits from using singe detectors behind each subaperture when used for sensing rapid varying wavefront in weak light. Moreover, due to non-discrete pixel imaging, this method is a potential solution for high measurement precision with fewer detecting units. Our simulations demonstrate the validity of the theoretical model. In addition, the results also indicate the advantage in measurement accuracy.