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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: Stephen A. Burns
  • Vol. 25, Iss. 11 — Nov. 1, 2008
  • pp: 2659–2669

Fresnel and Fraunhofer diffraction of a Gaussian laser beam by fork-shaped gratings

Ljiljana Janicijevic and Suzana Topuzoski  »View Author Affiliations


JOSA A, Vol. 25, Issue 11, pp. 2659-2669 (2008)
http://dx.doi.org/10.1364/JOSAA.25.002659


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Abstract

Expressions describing the vortex beams that are generated by the process of Fresnel diffraction of a Gaussian beam incident out of waist on fork-shaped gratings of arbitrary integer charge p, and vortex spots in the case of Fraunhofer diffraction by these gratings, are deduced. The common general transmission function of the gratings is defined and specialized for the cases of amplitude holograms, binary amplitude gratings, and their phase versions. Optical vortex beams, or carriers of phase singularity with charges m p and m p , are the higher negative and positive diffraction-order beams. The radial part of their wave amplitudes is described by the product of the m p th -order Gauss-doughnut function and a Kummer function, or by the first-order Gauss-doughnut function and the difference of two modified Bessel functions whose orders do not match the singularity charge value. The wave amplitude and the intensity distributions are discussed for the near and far fields in the focal plane of a convergent lens, as well as the specialization of the results when the grating charge p = 0 ; i.e., the grating turns from forked into rectilinear. The analytical expressions for the vortex radii are also discussed.

© 2008 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1970) Diffraction and gratings : Diffractive optics
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Physical Optics

History
Original Manuscript: June 25, 2008
Manuscript Accepted: August 24, 2008
Published: October 10, 2008

Citation
Ljiljana Janicijevic and Suzana Topuzoski, "Fresnel and Fraunhofer diffraction of a Gaussian laser beam by fork-shaped gratings," J. Opt. Soc. Am. A 25, 2659-2669 (2008)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-25-11-2659

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