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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 13, Iss. 3 — Mar. 1, 1974
  • pp: 623–629

Method for Evaluating Lateral Shearing Interferograms

M. P. Rimmer  »View Author Affiliations


Applied Optics, Vol. 13, Issue 3, pp. 623-629 (1974)
http://dx.doi.org/10.1364/AO.13.000623


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Abstract

Wavefront shearing interferometers have inherent advantages over more conventional interferometers because they do not need a separate reference wavefront. However, the fringe patterns are less directly related to the wavefront shape. In this paper, a method is described that uses data obtained from two lateral shear interferograms sheared in orthogonal directions to describe a wavefront of any arbitrary shape. Analysis of the data defines the wavefront on a regular grid, using a least squares criterion to match the measured data to the reconstructed shear data. Because each point on the final wavefront is involved in at most four measurements, the matrices tend to have many zero elements, making them easily solvable by simple numerical techniques, even for several hundred points. An error analysis indicates that the accuracy of the final results can be as good as the accuracy of the measured data. The procedure is described, and results of a typical analysis are shown.

© 1974 Optical Society of America

History
Original Manuscript: October 18, 1972
Revised Manuscript: September 17, 1973
Published: March 1, 1974

Citation
M. P. Rimmer, "Method for Evaluating Lateral Shearing Interferograms," Appl. Opt. 13, 623-629 (1974)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-13-3-623

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