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Nonparaxial propagation of a Gaussian optical vortex with initial radial polarization

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Abstract

We study the nonparaxial diffraction of a Gaussian vortex beam with initial radial polarization and an arbitrary integer topological charge n. Analytical relationships for the radial, azimuthal, and longitudinal components of the E-vector are deduced. At n=0, the azimuthal component of the field equals zero, with the radial and axial components becoming coincident with the relationships reported in [J. Opt. Soc. Am. A 26, 1366 (2009) ]. At any n>1, the vortex beam intensity on the optical axis equals zero, whereas at n=1 (1) an intensity peak is found in the focus. Explicit analytical relationships for a Gaussian vortex beam with initial elliptical polarization are also derived. Relationships that describe the nonparaxial radially polarized Gaussian beam are deduced as a linear combination of the Gaussian vortex beams with n=1 (1) and left- and right-hand circular polarization.

© 2010 Optical Society of America

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