Generalized method for sorting shack-hartmann spot patterns using local similarity

Daniel G. Smith, John E. Greivenkamp

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


The sensitivity and dynamic range of a Shack-Hartmann wavefront sensor is enhanced when the spots produced by the lenslet array are allowed to shift more than one lenslet radius from their on-axis positions. However, this presents the problem of accurately and robustly associating the spots with their respective subapertures. This paper describes a method for sorting spots that takes advantage of the local spot position distortions to unwrap the spot pattern. The described algorithm is both simple and robust and also applicable to any lenslet array geometry that can be described as a two-dimensional lattice, including hexagonal arrays, which are shown here to be more efficient than square arrays.

Original languageEnglish (US)
Pages (from-to)4548-4554
Number of pages7
JournalApplied optics
Issue number25
StatePublished - Sep 1 2008

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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