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Browsing by Subject "Photonics"

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Characterising the light output from Argon bombs by two simultaneous diagnostic techniques

Author: Olivier, Marius ; Mostert, FJ ; Snyman, IM Date: 2013 The light output from Argon-bombs was investigated by means of ultra high speed photography (Cordin Model 550-32 camera) and locally developed photodiode sensors. Tubes of various sizes were inflated with Argon gas, and were detonated on one ... Read more
Computational fluid dynamics model of the spinning pipe gas lens

Author: Mafusire, C ; Forbes, A ; Snedden, Glen C Date: Aug 2010 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 results of its performance ... Read more
Confidence estimation in the application of simulation in the development of aircraft self-protection measures

Author: Willers, Cornelius J ; Roodt, JH Date: Apr 2011 This paper describes the application of simulation in the development of aircraft self-protection countermeasures against infrared missiles. The integrated approach followed here consists of repeated cycles of materiel1 characterisation, ... Read more
Digitally controlling the ‘twist’ of light

Author: Dudley, Angela L ; Forbes, A Date: May 2014 This study reports on the presentation of the second international conference on applications of optics and photonics: Digitally controlling the ‘twist’ of light. Read more
Establishing an infrared measurement and modelling capability

Author: Willers, Cornelius J ; Al-Ghamdi, AA ; Bezuidenhout, DF ; Al-Hosiny, NM Date: Apr 2011 The protection of own aircraft assets against infrared missile threats requires a deep understanding of the vulnerability of these assets with regard to specific threats and specific environments of operation. A key capability in the protection ... Read more
Evolution of optical vortex distributions in stochastic vortex fields

Author: Roux, FS Date: Jan 2011 Stochastic vortex fields are found in laser speckle, in scintillated beams propagating through a turbulent atmosphere, in images of holograms produced by Iterative Fourier Transform methods and in the beams produced by certain diffractive ... Read more
High-speed imaging of dynamic shock wave reflection phenomena

Author: Naidoo, Kavendra ; Skews, BW Date: Sep 2010 Dynamic shock wave reflection generated by a rapidly pitching wedge in a steady supersonic free stream has been studied with numerical simulation previously. An experimental facility was developed for the investigation of these dynamic phenomena ... Read more
Intra-cavity vortex beam generation

Author: Naidoo, Darryl ; Aït-Ameur, K ; Forbes, A Date: Aug 2011 In this paper the authors explore vortex beams and in particular the generation of single LG0l modes and superpositions thereof. Vortex beams carry orbital angular momentum (OAM) and this intrinsic property makes them prevalent in transferring ... Read more
Laser development: Taking physics to industry

Author: Esser, D Date: Oct 2012 In this presentation the development path of new solid-state laser technology, which is taken from the underlying laser physics to challenging real world applications, is shown. Read more
Nanophotonics: The link between nanotechnology and photonics

Author: Ray, Suprakas S Date: Oct 2012 In this presentation the author outlines how nanotechnology is deeply linked with photonics for a bright future. 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 engineering in South Africa from 1960 to 2010 and beyond

Author: Willers, Cornelius J Date: Sep 2009 From its humble beginnings in an optical workshop in the Mowbray office for Triangulation in the 1930s and the subsequent formation of the Division for Optics and Spectroscopy at the National Physical Research Laboratory within the CSIR during ... Read more
Photonics in South Africa

Author: Bollig, C ; Forbes, A ; Dlamini, T Date: Dec 2007 This document gives an overview of the development of photonics in South Africa. The development of science, engineering and technology (SET) has been identified as one of the key elements for the long-term sustainability and competitiveness ... Read more
Research collaboration 2011: a joint publication highlighting the research partnerships between Tshwane University of Technology, University of Johannesburg, University of the Witwatersrand and the CSIR

Author: CSIR ; Tshwane University of Technology ; University of Johannesburg ; University of the Witwatersrand Date: 2011 The research partnership between three prominent universities-Tshwane University of Technology; University of Johannesburg; University of the Witwatersrand and the CSIR, which are guided by their respective memoranda of agreement, continued ... Read more
Strong reducing of the laser focal volume

Author: Godin, T ; Ngcobo, Sandile ; Cagniot, E ; Fromager, M ; Forbes, A ; Aït-Ameur, K Date: Aug 2011 Many applications of lasers seek nowadays for focal spots whose corresponding volume is getting smaller and smaller in order to ensure high spatial resolution. This problem, studied by many research groups around the world, is the core of ... Read more
Vitality of optical vortices (Presentation)

Author: Roux, FS Date: Feb 2014 This presentation discusses the vitality of optical vortices to distinguish between vortex dipole creation and annihilation events. Vitality is expressed in terms of the transverse 1st and 2nd order derivatives of the optical field. It can ... Read more

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Browsing by Subject "Photonics"

Browsing by Subject "Photonics"

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