title: Sorting method to extend the dynamic range of the Shack-Hartmann wave-front sensor.
abstract: We propose a simple and powerful algorithm to extend the dynamic range of a Shack-Hartmann wave-front sensor. In a conventional Shack-Hartmann wave-front sensor the dynamic range is limited by the f-number of a lenslet, because the focal spot is required to remain in the area confined by the single lenslet. The sorting method proposed here eliminates such a limitation and extends the dynamic range by tagging each spot in a special sequence. Since the sorting method is a simple algorithm that does not change the measurement configuration, there is no requirement for extra hardware, multiple measurements, or complicated algorithms. We not only present the theory and a calculation example of the sorting method but also actually implement measurement of a highly aberrated wave front from nonrotational symmetric optics.
authors.affiliation: Display Science and Technology Center, Eastman Kodak Company, 1700 Dewey Avenue, Rochester, New York 14650, USA. junwon.lee@kodak.com
authors.forename: Junwon
authors.initials: J
authors.lastname: Lee
authors.forename: Roland V
authors.initials: RV
authors.lastname: Shack
authors.forename: Michael R
authors.initials: MR
authors.lastname: Descour
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation* / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D019721:Ophthalmoscopes; D009887:Ophthalmoscopy / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D014159:Transducers