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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3670

Title: Spinning pipe gas lens revisited
Authors: Mafusire, C
Forbes, A
Snedden, G
Michaelis, MM
Keywords: Steel pipe
Graded index medium
Gas lens
Spinning pipe gas lens
Laser beam propagation
Computational fluid dynamic model
Laser beam
Optical waves
Issue Date: 2008
Publisher: Academy of Science of South Africa
Citation: Mafusire, C, Forbes, A, Snedden, G and Michaelis, MM. 2008. Spinning pipe gas lens revisited. South African Journal of Science, Vol. 104(7&8). pp 260-264
Abstract: The graded index (GRIN-like) medium generated by gas inside a heated steel pipe when rotated about its longitudinal axis has the ability to focus a laser beam. While the effective focal length of such a system has previously been studied, there is little information on optical phase aberrations and no study to date on the propagation parameters of the laser beam, but has rather remained rooted in the domain of ray optics. Researchers revisit the spinning pipe gas lens in this paper with new perspectives on the propagation of optical waves, and show how the position of the focus is not a measure of the focal length of the lens. This paper make use of both the intensity and phase information carried by waves to accurately measure the salient parameters of the lens, and complement our experimental findings with a computational fluid dynamics model.
Description: Copyright: 2008 Academy of Science of South Africa
URI: http://hdl.handle.net/10204/3670
ISSN: 0038-2353
Appears in Collections:Laser physics and technology
General science, engineering & technology

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