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Browsing by Author "Forbes, A"

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  • Forbes, A; Du Preez, NC; Belyi, VN; Botha, LR (Society of Photo-Optical Instrumentation Engineers, 2009-08)
    In this paper the researchers present results on improved paint stripping performance with an intra-cavity generated Flattened Gaussian Beam (FGB). A resonator with suitable diffractive optical elements was designed in ...
  • Litvin, IA; Burger, L; Forbes, A (Optical Society of America, 2007-10)
    A new approach to modeling the spatial intensity profile from Porro prism resonators is proposed based on rotating loss screens to mimic the apex losses of the prisms. A numerical model based on this approach is presented ...
  • Khanyile, T; Papathanasopoulos, M; Forbes, A; Mthunzi, P (Optical Society of America, 2013-04)
    Targeted drug delivery into HIV-1 infected cells offers a reduction in toxicity and side effect. Using a femtosecond (fs) laser of different beam shapes anti-HIV-1 drugs are efficiently delivered into TZM-bl cells.
  • Bollig, C; Forbes, A; Dlamini, T (Nature Publishing Group, 2007-12)
    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 ...
  • Litvin, IA; Burger, L; Forbes, A (2006-07)
    A physical optics model is proposed to describe the transverse modal patterns in crossed Porro prism resonators. The model departs from earlier attempts in that the prisms are modeled as non-classical rotating elements ...
  • Moraal, H; Britton, D; Derry, T; Forbes, A; Grayson, D; Mullins, S; Scholtz, F; Sefako, R (2009)
    The chapter is about physics and astronomy. The chapter gives a background about the origins of physics in South Africa. After the CSIR was founded in 1945, physics emerged as a nationwide and unified discipline. The authors ...
  • Long, CS; Loveday, PW; Forbes, A (2008-03)
    This paper describes the development of a deformable mirror to be used in conjunction with diffractive optical elements inside a laser cavity. A prototype piezoelectric unimorph adaptive mirror was developed to correct for ...
  • Litvin, IA; Dudley, Angela L; Forbes, A (Optical Society of America, 2011-08)
    The authors study theoretically the orbital angular momentum (OAM) density in arbitrary scalar optical fields, and outline a simple approach using only a spatial light modulator to measure this density. They demonstrate ...
  • Forbes, A; Botha, L (International Society for Optical Engineering, 2005-03)
    A model is developed for the breakdown and regeneration of component gases in an industrialised TEA CO2 laser, both with and without internal catalysts, and is found to be in excellent agreement with experimental data. The ...
  • West, NJ; Jandrell, IR; Forbes, A (2006)
    This paper describes the preliminary small-scale experiments conducted in order to investigate the influence of intensely focused laser light produced by a CO2 laser on high voltage fields. The laser used operated at a ...
  • West, NJ; Jandrell, IR; Forbes, A (2007-08)
    In this research, an orthogonally laser-triggered spark gap is investigated. The laser beam is directed in the region of a 30mm spark gap at 90 degrees to the gap and focused on the axis. The influence of plasma position ...
  • Roro, Kittessa T; Tile, N; Forbes, A (Elsevier, 2012-04)
    Nanocomposite materials have wide range of applications in solar energy conversion. In this work, C/NiO nanocomposite solar energy absorbing surfaces were prepared using sol-gel synthesis and deposited on aluminium substrates ...
  • Belyi, VN; Khilo, NA; Kazak, NS; Ryzhevich, AA; Forbes, A (Society of Photo-optical Instrumentation Engineers (SPIE), 2011-05)
    The authors investigate the generation and transformation of Bessel beams through linear and nonlinear optical crystals. They outline the generation of high-order vortices due to propagation of Bessel beams along the optical ...
  • Litvin, IA; McLaren, MG; Forbes, A (Society of Photo-Optical Instrumentation Engineers, 2008-08)
    The investigation into Bessel beams has been a topic of immense research during the past 20 years, due to the interesting properties they display. Bessel beams not only exhibit diffraction free propagation, but also ...
  • 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 ...
  • Burger, L; Forbes, A (South African Institute of Physics (SAIP), 2009-07)
    Propagation of Porro "petal" beams through a turbulent atmosphere.
  • Yalisi, B; Roro, Kittessa T; Forbes, A (ICFPAM2011, 2011-05)
    Pulsed laser deposition (PLD) is a thin-film deposition technique, which uses short and intensive laser pulses to evaporate target material. The technique has been used in this work to produce selective solar absorber (SSA) ...
  • Yalisi, B; Roro, Kittessa T; Tile, N; Forbes, A (SAIP 2011, 2011-07)
    Due to their excellent properties CNTs is believed to be the best candidate to be an absorbing elements in the composite. “Stoichiometric transfer” makes PLD a suitable candidate for the composite growth. PLD experimental ...
  • Dudley, Angela L; Rop, R; Litvin, IA; Lopez-Mariscal, C; Roux, FS; Forbes, A (SPIE, 2012-08)
    We experimentally generated superpositions of higher-order Bessel beams that possess no global orbital angular momentum (OAM), yet exhibit an angular rotation in their intensity profile as the field propagates. The digital ...
  • Dudley, Angela L; Litvin, IA; Forbes, A (Optical Society of America, 2012-03)
    In this work we derive expressions for the orbital angular momentum (OAM) density of light, for both symmetric and nonsymmetric optical fields, that allow a direct comparison between theory and experiment. We present a ...