Beam width of highly-focused radially-polarized fields.

Opt Express

Departamento de Óptica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040-Madrid, Spain.

Published: September 2010

On the basis of a formal analogy with the irradiance moments, analytical definitions are proposed for the width of both the transverse and the longitudinal component of rotationally-symmetric radially-polarized fields at the focal plane of a high-focusing optical system. The beam width of the whole field is also introduced. The transverse beam size is thus associated with the overall spatial structure of the field. The beam-width definitions are applied to an illustrative example, which enables us to show that, at the focal plane, the power contained within a circle whose radius is given by the proposed beam widths represents the main part of the total power.

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Source
http://dx.doi.org/10.1364/OE.18.020817DOI Listing

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