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Opt Lett. 2004 Sep 1;29(17):1968-70.

Toward a spherical spot distribution with 4pi focusing of radially polarized light.

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1
Department of Physics, Budapest University of Technology and Economics, Budapest 1111, Hungary. nandor.bokor@weizmann.ac.il

Abstract

The properties of the focal spot for 4pi focusing with radially polarized light are presented for various apodization factors. With a focusing system satisfying the Herschel condition, sharp focal spots with almost-perfect spherical symmetry (leading to equal axial and transverse resolution) and extremely low sidelobes are achieved.

PMID:
15455749
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