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Applied Optics

Applied Optics


  • Vol. 43, Iss. 16 — Jun. 1, 2004
  • pp: 3229–3234

Phase object data obtained from defocused laser speckle displacement

Eva-Lena Johansson, Lars Benckert, and Mikael Sjödahl  »View Author Affiliations

Applied Optics, Vol. 43, Issue 16, pp. 3229-3234 (2004)

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An optical technique that is based on defocused digital speckle photography is proposed for the evaluation of phase objects. Phase objects are different kinds of transparent or semi-transparent media that allow light to be transmitted. A phase object inserted in a laser speckle field introduces speckle displacement, from which information about the object may be extracted. It is shown that one may use speckle displacements to determine both the phase gradients and the positions of phase objects. As an illustration the positions and focal lengths of two weak lenses have been derived from defocused laser speckle displacement.

© 2004 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(110.6150) Imaging systems : Speckle imaging
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging

Original Manuscript: October 23, 2003
Revised Manuscript: March 9, 2004
Published: June 1, 2004

Eva-Lena Johansson, Lars Benckert, and Mikael Sjödahl, "Phase object data obtained from defocused laser speckle displacement," Appl. Opt. 43, 3229-3234 (2004)

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