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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 18, Iss. 11 — Nov. 1, 2001
  • pp: 2760–2766

Focal shifts in focused nonuniformly polarized beams

Jixiong Pu and Baida Lü  »View Author Affiliations

JOSA A, Vol. 18, Issue 11, pp. 2760-2766 (2001)

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We present a simple formula to evaluate the relative focal shift in a circular-aperture lens system illuminated by a nonuniformly polarized (NUP) light wave. Specifically, it is shown that the relative focal shift is determined by the effective Fresnel number. The effective Fresnel number is equal to the product of the Fresnel number of the lens aperture and the parameter σ, which describes the uniformity of the polarization distribution of the NUP beam across the lens aperture. Some examples are given to illustrate the use of this approach. The influence of the polarization distribution of the incident NUP light wave on the polarization distribution in the axial points of the focused field is also presented.

© 2001 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(260.5430) Physical optics : Polarization

Jixiong Pu and Baida Lü, "Focal shifts in focused nonuniformly polarized beams," J. Opt. Soc. Am. A 18, 2760-2766 (2001)

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