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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 4, Iss. 10 — May. 10, 1999
  • pp: 411–419

Focal shift in vector beams

Pamela L. Greene and Dennis G. Hall  »View Author Affiliations

Optics Express, Vol. 4, Issue 10, pp. 411-419 (1999)

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We examine the three-dimensional intensity distribution of vector Bessel–Gauss beams with general polarization near the focus of a nonaperturing thin lens. Recently reported linearly and azimuthally polarized Bessel–Gauss beams are members of this family. We define the width and focal plane of such a vector beam using an encircled-energy criterion and calculate numerically that, as for scalar beams, the true focus occurs not at the geometric focus of the lens but rather somewhat closer to the lens. This focal shift depends on the mode number and system parameters and is largest for a narrow beam, long lens focal length, and large wavelength.

© Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(220.2560) Optical design and fabrication : Propagating methods

ToC Category:
Research Papers

Original Manuscript: March 8, 1999
Published: May 10, 1999

Pamela Greene and Dennis Hall, "Focal shift in vector beams," Opt. Express 4, 411-419 (1999)

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