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Optics Letters

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  • Vol. 21, Iss. 18 — Sep. 15, 1996
  • pp: 1421–1423

Phase-stepped speckle shearing interferometer by source wavelength modulation

J.-R. Huang, H. D. Ford, and R. P. Tatam  »View Author Affiliations


Optics Letters, Vol. 21, Issue 18, pp. 1421-1423 (1996)
http://dx.doi.org/10.1364/OL.21.001421


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Abstract

Phase stepping by wavelength modulation of the optical source is demonstrated in a path-length unbalanced shearing interferometer. A magnification difference, which accompanies the path-length imbalance in the interferometer, introduces an unwanted radial shear, which is shown to be compensated by inclusion of a block of high-refractive-index material in the longer interferometer arm. The block also increases the phase shift obtained for a given wavelength change. The phase-stepping technique is demonstrated with a three-step algorithm to measure out-of-plane strain on a flat metal plate.

© 1996 Optical Society of America

History
Original Manuscript: April 8, 1996
Published: September 15, 1996

Citation
J.-R. Huang, H. D. Ford, and R. P. Tatam, "Phase-stepped speckle shearing interferometer by source wavelength modulation," Opt. Lett. 21, 1421-1423 (1996)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-21-18-1421


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