This article is cited in 3 papers

Laser applications and other topics in quantum electronics

Focused Bessel beams

P. V. Adamson

Institute of Physics, University of Tartu, Estonia

Abstract: The diffraction broadening of a focused beam with a Bessel amplitude distribution is examined. Calculations are reported not only of the traditional differential characteristics (radial distributions of the electric-energy densities and of the axial total electromagnetic energy flux in the beam), but also of integral quantities characterising the degree of transverse localisation of the radiation in a tube of specified radius within the beam. It is shown that in a large-aperture Bessel beam only a very small fraction of the total beam power is concentrated in its central core and that a focal point is also observed on intense focusing of the Bessel beam. This spot is not in the geometric-optical focal plane but is displaced from the latter by a certain distance.

PACS: 42.25.Fx, 42.15.Dp

Received: 22.10.1999

 English version: Quantum Electronics, 2000, 30:4, 365–369

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