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Browsing by Subject "Laser beam propagation"

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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 beam propagation in non-linearly absorbing media

Author: Forbes, A Date: Aug 2006 Many analytical techniques exist to explore the propagation of certain laser beams in free space, or in a linearly absorbing medium. When the medium is nonlinearly absorbing the propagation must be described by an iterative process using the ... 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
Synthesis of tungsten oxide nano structures by laser pyrolysis

Author: Mwakikunga, Bonex W ; Forbes, A ; Sideras-Haddad, E ; Erasmus, RM ; Katumba, G ; Masina, Bathusile N Date: 2008 Since the proposal to synthesise materials by laser assisted pyrolysis in the 1970s, and its practical realisation in 1982, a number of researchers have used this method in obtaining nano-powders from liquid droplets. This study revisits this ... Read more

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Browsing by Subject "Laser beam propagation"

Browsing by Subject "Laser beam propagation"

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