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Browsing by Author "Forbes, A"

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  • Dudley, Angela L; Nock, M; Konrad, T; Roux, F; Forbes, A (South African Institute of Physics, 2010-09)
    An interferometer, mimicking an amplitude damping channel for vortex modes, is presented. Experimentally the action of the channel is in good agreement with that predicted theoretically. Since we can characterize the action ...
  • Litvin, IA; Burger, L; Forbes, A (The International Society for Optical Engineering, 2007)
    A model to describe the transverse field distribution of the output beam from porro prism resonators is proposed. The model allows the prediction of the output transverse field distribution by assuming that the main areas ...
  • Dudley, Angela L; Vette, C; Szameit, A; Forbes, A (SPIE, 2015-08)
    Significant interest has been devoted to tailoring optical fields that transversely accelerate during propagation in the form of Airy, Weber and Mathieu beams. In this work, the authors introduce a new type of optical field ...
  • Litvin, IA; Burger, L; Forbes, A (OSA Publishing, 2013-09)
    The self-reconstruction of superpositions of Laguerre–Gaussian (LG) beams has been observed experimentally, but the results appear anomalous and without a means to predict under what conditions this take place. In this ...
  • Nkosi, SS; Yalisi, B; Motaung, DE; Keartland, J; Sideras-Haddad, E; Forbes, A; Mwakikunga, BW (Elsevier, 2013-01)
    Thin films of nickel oxide (NiO) were deposited on Al substrates at different substrate temperatures using pulsed laser deposition (PLD). Microwave power absorption measurements at 9.4 GHz (X-band) were carried out on these ...
  • Dudley, Angela L; Litvin, I; Roux, FS; Forbes, A (SAIP, 2012-07)
    This presentation analyses the azimuthal decomposition of optical modes. Decomposition of azimuthal modes need two steps, namely generation and decomposition. An azimuthally-varying phase (bounded by a ring-slit) placed ...
  • Litvin, IA; Dudley, Angela L; Roux, FS; Forbes, A (Optical Society of America, 2012-05)
    We demonstrate a simple approach, using digital holograms, to perform a complete azimuthal decomposition of an optical field. Importantly, we use a set of basis functions that are not scale dependent so that unlike other ...
  • Zhang, Y; Roux, FS; McLaren, M; Forbes, A (SPIE, 2014-08)
    Considering the quantum state produced in type I spontaneous parametric down-conversion with collinear, degenerate signal and idler beams, and a Gaussian pump, we show that the azimuthal Schmidt number in the Laguerre-Gaussian ...
  • Schulze, C; Flamm, D; Duparré, M; Forbes, A (Optical Society of America, 2012-11)
    We present a fast and easy technique for measuring the beam propagation ratio, M2, of laser beams using a spatial light modulator. Our technique is based on digitally simulating the free-space propagation of light, thus ...
  • Mclaren, M; Roux, FS; Forbes, A (2013-07)
    This is a power point presentation on testing Bessel-Gaussian entanglement.
  • Belyi, VN; Forbes, A; Kazak, NS; Khilo, NA; Ropot, PI (Society of Photo-Optical Instrumentation Engineers (SPIE), 2009-08)
    A new type of Bessel-like optical beams, which is distinguished by the dependence on the cone angle from the longitudinal coordinate, is investigated. Such beams have the properties of Bessel beams (ring-spatial spatial ...
  • Litvin, IA; Forbes, A (Elsevier Science B.V. Amsterdam., 2008-05)
    The authors investigate a conventional resonator configuration, using only spherical curvature optical elements, for the generation of Bessel–Gauss beams. This is achieved through the deployment of a suitable amplitude ...
  • Roro, Kittessa T; Mwakikunga, B; Forbes, A; Tile, N; Yalisi, B (SAIP 2010, 2010-09)
    Multi-walled carbon nanotube (MWCNT)/Nickel oxide nanocomposites were prepared on aluminum substrates for selective solar absorber applications. MWCNTs are functionalized in order to disperse in water and ethanol. Results ...
  • Katumba, G; Baisitse, T; Forbes, A; Olumekor, L; Wackelgard, E (2006-07)
    The Bruggeman and Maxwell-Garnett effective medium approximations (EMAs) have been used to investigate optical properties of composite materials. The EMA assumptions are based on random unit cell models in which metal ...
  • Katumba, G; Forbes, A (Society of Photo-optical Instrumentation Engineers (SPIE), 2009-08)
    The Bruggeman and Maxwell-Garnett effective medium approximations have been used widely to investigate optical properties of many different composite materials. In most cases, the effective medium approximation assumptions ...
  • Tile, N; Roro, Kittessa T; Forbes, A (2011-07)
    Nanocomposite materials have wide range of applications in solar energy conversion. In this work, C-NiO nanocomposite coatings are prepared using sol-gel synthesis and deposited on aluminium substrates using a spin coater. ...
  • 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 ...
  • Baisitse, TR; Forbes, A; Katumba, G; Botha, JR; Engelbrecht, JAA (John Wiley & Sons Ltd, 2008)
    In this paper, infrared reflectance spectroscopy was employed to extract information on the optical and electrical properties of metal organic vapour phase epitaxial (MOVPE) grown InAs and InAsSb epilayers. These epitaxial ...
  • Dudley, Angela L; Naidoo, Darryl; Forbes, A (SPIE, 2016-09)
    We show how one can determine the various properties of light, from the modal content of laser beams to decoding the information stored in optical fields carrying orbital angular momentum, by performing a modal decomposition. ...