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Browsing by Author "Michaelis, MM"

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Gas lensing in a heated spinning pipe

Author: Mafusire, C ; Forbes, A ; Snedden, Glen C ; Mahlase, Andrew CK ; Michaelis, MM ; Mathuthu, M Date: Jul 2006 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 caused by mixing of ... Read more
Laser propulsion activity in South Africa

Author: Michaelis, MM ; Forbes, A ; Klopper, W ; Bencherif, H ; Jolivet, S ; Moorgawa, R ; McKenzie, E ; Turner, G Date: Jul 2006 Three sets of laser propulsion experiments have been conducted in South Africa. The first, on the MLIS kilowatt CO2 laser at Pelindaba, gave a surprisingly good result but could not be repeated after the laser chain was dismantled when South ... Read more
Laser propulsion: a review

Author: Michaelis, MM ; Forbes, A Date: Jul 2006 Early proposals for laser propulsion were surveyed. Propulsion theory and laboratory momentum coupling experiments demonstrate how it is possible to choose the target material so as to optimize payload efficiency, with a possible order-of-magnitude ... Read more
Lasers in space.

Author: Michaelis, MM ; Forbes, A ; Bingham, R ; Kellett, BJ ; Mathye, A Date: Apr 2008 A variety of laser applications in space, past, present, future and far future are reviewed together with the contributions of some of the scientists and engineers involved, especially those that happen to have South African connections. ... Read more
Non-solid non-rigid optics for high-power laser systems

Author: Michaelis, MM ; Forbes, A ; Conti, A ; Nativel, N ; Bencherif, H ; Bingham, R ; Kellett, B ; Govender, K Date: 14 Jun 2006 Non-solid and non-rigid optics employ gas and liquid transmission and reflection, as well as flexible membranes to influence laser beams, laser driven particle beams and harmonic generators. Some examples are acoustic gratings, phase conjugate ... Read more
Optical aberrations in a gas lenses

Author: Mafusire, C ; Forbes, A ; Michaelis, MM ; Snedden, Glen C Date: Aug 2010 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 flame lens (FL). The ... Read more
Optical aberrations in a spinning pipe gas lens

Author: Mafusire, C ; Forbes, A ; Michaelis, MM ; Snedden, Glen C Date: Jun 2008 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 time analyse both ... Read more
Spinning pipe gas lens revisited

Author: Mafusire, C ; Forbes, A ; Snedden, Glen C ; Michaelis, MM Date: 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 been studied, ... Read more
Wave aberrations in a spinning pipe gas lens

Author: Mafusire, C ; Forbes, A ; Michaelis, MM ; Snedden, Glen C Date: Jun 2009 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 has a deleterious ... Read more

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Browsing by Author "Michaelis, MM"

Browsing by Author "Michaelis, MM"

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