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Browsing by Author "Mafusire, C"

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  • Snedden, Glen C; Forbes, A; Mahlatse, ACK; Mafusire, C; Michaelis, MM (2006-07)
    Slides on: Spinning Pipe Gas Lens; Focal Length; Refractive Index; Gas Dynamics; Guess at the gas dynamics; Density Profile; Flow Profile; Rosby Waves; Rayleigh–Taylor Instabilities
  • Mafusire, C; Forbes, A; Snedden, Glen C; Michaelis, MM (International Society for Optical Engineering (SPIE), 2007)
    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 ...
  • Mafusire, C; Forbes, A; Snedden, Glen C (2010-08)
    When a metal horizontal pipe is heated and spun along its axis, a graded refractive index distribution is generated which is can be used as a lens, thus its name, the spinning pipe gas lens (SPGL). Previous experimental ...
  • Naidoo, Darryl; Mafusire, C; Forbes, A (South African Institute of Physics, 2009-07)
    An optical aberration is a distortion of an image as compared to the object due to defects in an optical system
  • Mafusire, C; Forbes, A; Snedden, Glen C; Mahlase, ACK; Michaelis, MM; Mathuthu, M (2006-07)
    When a heated pipe is rotated, the dynamics of the gas inside exhibit properties reminiscent of a solid-state positive lens. The properties are a result of a parabolic distribution of refractive index in the pipe which is ...
  • Mafusire, C; Forbes, A (Optical Society of America, 2011-07)
    The authors outline a theory for the calculation of the beam quality factor of an aberrated laser beam. They provide closed form equations that show that the beam quality factor of an aberrated Gaussian beam depends on all ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (2010-08)
    Gas lenses work on the basis that aerodynamic media can be used to generate a graded refractive index distribution which can be used to focus a laser beam. Examples of these are the spinning pipe gas lens (SPGL) and the ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (Optical Society of America, 2008-06)
    If a heated pipe is rotated about its axis, a density gradient is formed which results in the pipe acting as a graded index lens. In this study the authors revisit the concept of a spinning pipe gas lens and for the first ...
  • Mafusire, C; Forbes, A (South African Institute of Physics (SAIP), 2009-07)
    The researchers have managed to do quantitative analysis of ‘controlled’ turbulence. The researchers could control the degree of turbulence by controlling the rotation speed and wall temperature of the spinning pipe gas ...
  • Chaibi, A; Mafusire, C; Forbes, A (IOP Publishing, 2013-09)
    The orbital angular momentum of light has been suggested as a means of information transfer over free-space, yet the detected optical vortex is known to be sensitive to perturbation. Such effects have been studied ...
  • Mafusire, C (SAIP 2010, 2010-09)
    A model is used to calculate the beam quality factor of a laser beam from Zernike coefficients. It is tested by programming aberration coefficients on a laser beam and measuring the beam quality using a Shack-Hartmann ...
  • Mafusire, C; Forbes, A (AOSIS OpenJournals, 2013-11)
    When the walls of an open-ended horizontal steel pipe are heated before the pipe is rotated along its axis, the exchange of the expelled heated air with the incoming cooler air, sucked in along the axis, results in a medium ...
  • Mafusire, C; Forbes, A; Snedden, Glen C; Michaelis, MM (Academy of Science of South Africa, 2008)
    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 ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (2009-06)
    The graded index (GRIN-like) medium generated by a gas inside a heated pipe when it is rotated about its longitudinal axis has the ability to focus a laser beam. However, recent research has shown that the medium generated ...
  • Mredlana, Prince; Naidoo, Darryl; Mafusire, C; Kruger, T; Dudley, Angela; Forbes, A (2016-07)
    Optical field characterisation often requires various isolated experiments to obtain characterisation parameters, we investigate a novel approach to characterise an optical field employing a Wigner distribution function ...