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Proceedings Paper

Optically tunable hollow Gaussian beams using thin metal films
Author(s): Irina Gerdova; Xinhui Zhang; Alain Hache
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Paper Abstract

We report the formation of optically tunable, smooth, hollow beams by reflection of a TEM00 Gaussian beam off a metal thin film. Hollow (doughnut-like) beams (HB) with controllable profiles are created by a phase distortion at the surface. Two regimes of operation are observed: below a certain power threshold, the hollow beam formation is reversible and optically tunable on a time scale of milliseconds; above that threshold, alterations on the film surface make the effect permanent. Optical control of the hollow beam shape is demonstrated by tuning the power of a second beam. High stability in the radial intensity profile and the possibility of adjusting the spatial distribution and aspect ratios make this technique promising for applications such as atom trapping and manipulation of Bose-Einstein condensates.

Paper Details

Date Published: 8 September 2006
PDF: 8 pages
Proc. SPIE 6343, Photonics North 2006, 63432B (8 September 2006); doi: 10.1117/12.707971
Show Author Affiliations
Irina Gerdova, Univ. of Moncton (Canada)
Xinhui Zhang, Univ. of Moncton (Canada)
Alain Hache, Univ. of Moncton (Canada)

Published in SPIE Proceedings Vol. 6343:
Photonics North 2006
Pierre Mathieu, Editor(s)

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