GENERAL ENQUIRIES: Tel: + 27 12 841 2911 | Email: callcentre@csir.co.za

Browsing by Author "Forbes, A"

Sort by: Order: Results:

  • Schulze, C; Roux, FS; Dudley, Angela L; Rop, R; Duparre, M; Forbes, A (American Physical Society, 2015)
    We introduce a class of light field that angularly accelerates during propagation. We show that the acceleration (deceleration) may be controlled by adjustment of a single parameter, and tuned continuously, down to no ...
  • Schulze, C; Roux, FS; Dudley, Angela L; Rop, R; Duparre, M; Forbes, A (2015-04)
    We introduce a class of light field that angularly accelerates during propagation. We show that the acceleration (deceleration) may be controlled by adjustment of a single parameter, and tuned continuously, down to no ...
  • McLaren, M; Sidderas-Haddad, E; Forbes, A (Academy of Science of South Africa (ASSAf), 2011-09)
    It is now well known that matter may be trapped by optical fields with high intensity gradients. Once trapped, it is then possible to manipulate microscopic particles using such optical fields, in so-called optical tweezers. ...
  • von Bergmann, HM; Forbes, A; Roberts, T; Botha, LR (International Society for Optical Engineering, 2008-08)
    Results are presented on the influence of acoustic waves on the performance of high-repetition-rate TEA CO2 lasers. It is shown that acoustic waves generated inside the laser cavity lead to nonuniform discharges, resulting ...
  • Dudley, Angela L; Vasilyeu, R; Belyi, V; Khilo, N; Ropot, P; Forbes, A (South African Institute of Physics, 2010-09)
    The authors implement a novel technique to operate a phase-only spatial light modulator (SLM) in amplitude mode, allowing them to reproduce Durnin’s ring slit on a liquid crystal display (LCD). The affects of binary and ...
  • Masina, B; Forbes, A (CSIR, 2010)
    Industrial diamonds are heated by a laser beam and the resulting temperature is optically measured on the surface of the diamond. The ultimate aim is that with the heating and temperature known and measurements being ...
  • Masina, BN; Forbes, A; Bodkin, R; Mwakikunga, BW (CSIR, 2010-09)
    In this poster the authors discussed the ability to heat an industrial diamond sample by means of optical absorption of a CO2 laser beam, and then measure the resulting temperature on the surface of the diamond optically ...
  • Dudley, Angela L; Milione, G; Alfano, RR; Forbes, A (Optical Society of America, 2014)
    We present a new all-digital technique to extract the wavefront of a structured light beam. Our method employs non-homogeneous polarization optics together with dynamic, digital holograms written to a spatial light modulator ...
  • Masina, BN; Forbes, A; Bodkin, R; Mwakikunga, BW (CSIR, 2012-07)
    Diamond tools are used in industry for abrasive applications such as grinding, and drilling. One of its important applications is in drill bits used for drilling through rock in search of oil. The early failure of drill ...
  • Dudley, Angela L; Nock, M; Konrad, T; Forbes, A (IOP Institute of Pyhsics, 2010-03)
    Since the pioneering work on the entanglement of the orbital angular momentum (OAM) states of light, much attention has been devoted to the subject, with particular attention into the quantum aspects of information processing ...
  • Dudley, Angela L; Nock, M; Konrad, T; Roux, FS; Forbes, A (Optical Society of America, 2010-10)
    In this article, the authors present an amplitude damping channel for Laguerre-Gaussian modes. The channel is tested experimentally for a Laguerre-Gaussian mode, having an azimuthal index l = 1, illustrating that it decays ...
  • 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 ...