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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1291

Title: Characterisation of a spinning pipe gas lens using a Shack–Hartmann wavefront sensor
Authors: Mafusire, C
Forbes, A
Snedden, G
Michaelis, MM
Keywords: Spinning pipe gas lens
Zernike polynomials
GRIN lens
Optical wavefront
Issue Date: 2007
Publisher: International Society for Optical Engineering (SPIE)
Citation: Mafusire, C et al. 2007. Characterisation of a spinning pipe gas lens using a Shack–Hartmann wavefront sensor. Proceedings of SPIE, Vol. 6663(6663OH), pp 1-8
Abstract: A heated horizontal spinning pipe causes gases inside it to assume dynamics resulting in a graded index lens – a spinning pipe gas lens (SPGL). A CFD model is presented which shows that gas exchanges of the SPGL with the surroundings resulting in a near parabolic density distribution inside the pipe created by the combination of velocity and thermal boundary layers. Fluid dynamic instabilities near the wall of the pipe are thought to have an deleterious effect on the quality of the beam and its wavefront. Measurements of the wavefront of a propagating laser beam shows strong defocus and tilt as well as higher order aberrations, thereby reducing the beam quality factor (M2) of the output beam. Results are presented as a function of pipe wall temperature and pipe rotation speed.
Description: Copyright: 2007 SPIE - The International Society for Optical Engineering
URI: http://hdl.handle.net/10204/1291
ISSN: 0277-786X
Appears in Collections:Laser physics and technology
General science, engineering & technology

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