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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 20 — Jul. 10, 2011
  • pp: 3598–3603

Zonal wavefront sensor with reduced number of rows in the detector array

Bosanta R. Boruah and Abhijit Das  »View Author Affiliations

Applied Optics, Vol. 50, Issue 20, pp. 3598-3603 (2011)

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In this paper, we describe a zonal wavefront sensor in which the photodetector array can have a smaller number of rows. The test wavefront is incident on a two-dimensional array of diffraction gratings followed by a single focusing lens. The periodicity and the orientation of the grating rulings of each grating can be chosen such that the + 1 order beam from the gratings forms an array of focal spots in the detector plane. We show that by using a square array of zones, it is possible to generate an array of + 1 order focal spots having a smaller number of rows, thus reducing the height of the required detector array. The phase profile of the test wavefront can be estimated by measuring the displacements of the + 1 order focal spots for the test wavefront relative to the + 1 order focal spots for a plane reference wavefront. The narrower width of the photodetector array can offer several advantages, such as a faster frame rate of the wavefront sensor, a reduced amount of cross talk between the nearby detector zones, and a decrease in the maximum thermal noise. We also present experimental results of a proof-of-concept experimental arrangement using the proposed wavefront sensing scheme.

© 2011 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(050.1950) Diffraction and gratings : Diffraction gratings
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(070.6120) Fourier optics and signal processing : Spatial light modulators

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: March 28, 2011
Revised Manuscript: May 28, 2011
Manuscript Accepted: May 30, 2011
Published: July 7, 2011

Bosanta R. Boruah and Abhijit Das, "Zonal wavefront sensor with reduced number of rows in the detector array," Appl. Opt. 50, 3598-3603 (2011)

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