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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 29, Iss. 9 — Sep. 1, 2012
  • pp: 2019–2027

Spatial correlation properties of twisted partially coherent light focused by diffractive axicons

Mohamed Ali Shukri, Abdu. Ahmed Alkelly, and Yaqoub Shamsaddeen Alarify  »View Author Affiliations


JOSA A, Vol. 29, Issue 9, pp. 2019-2027 (2012)
http://dx.doi.org/10.1364/JOSAA.29.002019


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Abstract

We investigate the spatial coherence properties of a twisted, partially coherent field in the focal region of diffractive axicons. We demonstrate that the focused field is a combination of an infinite number of weighted, mutually uncorrelated, helical components, whose weights depend on both the coherence width and the twist strength, and the total helicity of the field inverts its handedness depending on the twist handedness and vanishes at the nontwist limit. Depending on the variances of whichever the effective coherence width, the twist strength, the twist handedness of the illumination, or the shape of the axicon phase function, substantive changes will intervene on the distribution of the spatial coherence degree of the focused field. In particular, the twist strength of the illumination influences both the phase and amplitude of the spatial degree of coherence, while the twist handedness just inverts its phase. In addition, the spectral degree of coherence of the focused field possesses phase singularities, and their locations and shapes are affected by the coherence and twist properties of the illumination and the shape of the axicon phase function.

© 2012 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(030.6600) Coherence and statistical optics : Statistical optics
(050.1960) Diffraction and gratings : Diffraction theory
(260.1960) Physical optics : Diffraction theory
(350.5500) Other areas of optics : Propagation

ToC Category:
Propagation

History
Original Manuscript: June 26, 2012
Manuscript Accepted: July 18, 2012
Published: August 31, 2012

Citation
Mohamed Ali Shukri, Abdu. Ahmed Alkelly, and Yaqoub Shamsaddeen Alarify, "Spatial correlation properties of twisted partially coherent light focused by diffractive axicons," J. Opt. Soc. Am. A 29, 2019-2027 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-9-2019


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