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Optics Letters

Optics Letters


  • Vol. 29, Iss. 11 — Jun. 1, 2004
  • pp: 1257–1258

Comment on ''Phase-shift extraction and wave-front reconstruction in phase-shifting interferometry with arbitrary phase steps''

José A. Ferrari and Eugenio Garbusi  »View Author Affiliations

Optics Letters, Vol. 29, Issue 11, pp. 1257-1258 (2004)

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We comment on the recent Letter by Cai et al. [Opt. Lett. 28, 1808 (2003)] in which an approach to phase-shifting interferometry with arbitrary phase steps was proposed. Cai et al. based their method of phase shifting on the idea that the intensities of the reference and object beams can be measured previously, which actually makes the whole posterior phase-shifting procedure absolutely unnecessary. Their method is also based on the statement that the phase of the Fresnel diffraction pattern of a test object if generally a spatially random distribution, which in most situations is wrong.

© 2004 Optical Society of America

OCIS Codes
(090.2880) Holography : Holographic interferometry
(100.3010) Image processing : Image reconstruction techniques
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

José A. Ferrari and Eugenio Garbusi, "Comment on ''Phase-shift extraction and wave-front reconstruction in phase-shifting interferometry with arbitrary phase steps''," Opt. Lett. 29, 1257-1258 (2004)

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  1. L. Z. Cai, Q. Liu, and X. L. Yang, Opt. Lett. 28, 1808 (2003).
  2. E. Greivenkamp and J. H. Bruning, in Optical Shop Testing, D. Malacara, ed. (Wiley, New York, 1992), pp. 501–598.

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