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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 2 — Jan. 15, 2010
  • pp: 202–204

Zonal wavefront sensing using an array of gratings

B. R. Boruah  »View Author Affiliations


Optics Letters, Vol. 35, Issue 2, pp. 202-204 (2010)
http://dx.doi.org/10.1364/OL.35.000202


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Abstract

We describe a zonal-wavefront-sensing technique using an array of plane diffraction gratings. A spatially coherent beam, whose wavefront is to be measured, is incident on the array of gratings. The direction of a diffracted beam of a certain diffraction order is a function of the orientation and periodicity of the corresponding grating. Thus, by choosing the orientation and periodicity of each grating appropriately and by having a lens immediately behind the grating array, it is possible to get an array of focal spots. The profile of the incident wavefront can be estimated from the displacements of these focal spots relative to those due to an unaberrated beam. The arrangement makes it possible to increase the separation between two adjacent focal spots corresponding to two nearby gratings without effecting the areas of the gratings. Consequently, a relatively large dynamic range in wavefront measurement can be achieved without compromising the accuracy. With the arrangement it is also possible to use a photodetector array whose outline is independent of the grating array outline. The proposed wavefront-sensing technique is implemented experimentally using a liquid-crystal spatial-light modulator in conjunction with a CCD camera, and the obtained results are presented.

© 2010 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:
Diffraction and Gratings

History
Original Manuscript: October 14, 2009
Revised Manuscript: December 7, 2009
Manuscript Accepted: December 8, 2009
Published: January 14, 2010

Citation
B. R. Boruah, "Zonal wavefront sensing using an array of gratings," Opt. Lett. 35, 202-204 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-2-202


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