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Proceedings Paper

Characterization of laser beams using concentric transmission rings
Author(s): Brigitte Belanger; Reza Massudi; Michel Piche
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Paper Abstract

It is known that the Fourier transform of an infinitesimally thin circular ring is a Bessel function. By fabricating a mask with zero transmittance except at a given number of concentric thin rings, we have generated a series of Bessel beams, each of which constitutes a diffraction-free beam. We show theoretically and experimentally that a proper selection of Bessel beams leads to a periodic pattern along the propagation axis, e.g. a self-imaging field is produced. The on-axis profile of the field is then expressed as the discrete Fourier transform of the beam incident on the mask. The position of the intensity maxima along the propagation axis provides a direct measurement of the curvature of the wavefront of the incident laser beam. We further propose to use a transmission mask with a specific distribution of thin rings as a method to measure the second-order moment of laser beams.

Paper Details

Date Published: 20 November 1996
PDF: 7 pages
Proc. SPIE 2870, Third International Workshop on Laser Beam and Optics Characterization, (20 November 1996); doi: 10.1117/12.259885
Show Author Affiliations
Brigitte Belanger, Centre d'Optique, Photonique et Laser/Univ. Laval (Canada)
Reza Massudi, Centre d'Optique, Photonique et Laser/Univ. Laval (Canada)
Michel Piche, Centre d'Optique, Photonique et Laser/Univ. Laval (Canada)


Published in SPIE Proceedings Vol. 2870:
Third International Workshop on Laser Beam and Optics Characterization
Michel Morin; Adolf Giesen, Editor(s)

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