Focused Bessel beams
- Institute of Physics, Tartu (Estonia)
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. (laser applications and other topics in quantum electronics)
- OSTI ID:
- 21448359
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Vol. 30, Issue 4; Other Information: DOI: 10.1070/QE2000v030n04ABEH001726; ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
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