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

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Abstract

The properties of the focal spot for 4π 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.

© 2004 Optical Society of America

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