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Browsing Laser physics and technology by Title

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  • Sivakumar, V; Faduilhe, D; Bencherif, H (2006-07)
    The lidar data collected for about 10 year’s period from 1994 to 2004 are used for the present study. The recorded raw data is in the form of photon count profiles with a height resolution of 300 m and time resolution of ...
  • Shaik, A; Tlale, NS; Bright, G (Massey University, 2008-12)
    A low cost sensor system is envisaged that has 2 distinct routes for resolution enhancement in position detection. The main area for application of the sensor design would be in the food processing and packaging industry ...
  • Charyulu, DV; Sivakumar, V; Bencherif, H; Kirgis, G; Hauchecorne, A; Rao, DN (Copernicus Publications, 2007-11)
    The present study delineates the characteristics of Stratospheric Sudden Warming (SSW) events observed over the Observatoire de Haute Provence (OHP: 44°N, 6°E). The study uses 20 years of Rayleigh LiDAR temperature ...
  • Strauss, Hencharl J; Preussler, D; Esser, MJD; Koen, W; Jacobs, Cobus; Collett, OJP; Bollig, C (Optical Society of America, 2013-04)
    We report on a double-pass Ho:YLF slab amplifier which delivered 350 ns long single-frequency pulses of up to 330 mJ at 2064 nm, with a maximum M(sup2) of 1.5 at 50 Hz. It was end pumped with a diode-pumped Tm:YLF slab ...
  • 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 ...
  • Andhavarapu, EV; Loveday, Philip W; Long, Craig S; Heyns, PS (SACAM 2010, 2010-01)
    The semi-analytical finite element method (SAFE) is a popular method for analysing guided wave propagation in elastic waveguides of complex cross-section such as rails. The convergence of these models has previously been ...
  • 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 ...
  • Anochie-Boateng, Joseph; Komba, Julius J; Mvelase, Gculisile M (International Road Federation, 2011-11)
    The Council for Scientific and Industrial Research (CSIR) is undertaking a research project to investigate the use of laser-based scanning technology to quantify the morphological/shape properties (i.e., form - flatness, ...
  • Tesfaye, M; Sivakumar, V; Botai, J; Tsidu, M (American Geophysical Union, 2011-10)
    In this paper, the authors present a detailed study of the spatial and seasonal aerosol climatology over South Africa (SA), based on Multiangle Imaging Spectroradiometer (MISR) data. They've have used 10 years (2000–2009) ...
  • Sivakumar, V; Tesfaye, M; Alemu, W; Sharma, Ameeth; Bollig, C; Mengistu, G (World Scientific Publishing Company, 2010-05)
    In this study, the authors present the climatological picture of aerosols over South Africa using 20 years of Stratosphere Aerosol and Gas Experiment (SAGE-II) satellite, 6–10 years of AErosol RObatic NETwork (AERONET) and ...
  • Sivakumar, V; Tesfaye, M; Alemu, W; Moema, D; Sharma, Ameeth; Bollig, C; Mengistu, G (2009-08)
    This presentation provides aerosol measurement over Southern Africa, using LIDAR, satellite and sun-photometer. Aerosol formation and processes are also given.
  • 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 ...
  • Anochie-Boateng, Joseph; Komba, Julius J; Tutumluer, E (American Society of Civil Engineers, 2012-02)
    For several decades, efforts have been made by engineers and researchers in the road and airfield pavements, and railroads to develop methods/procedures for accurate quantification of aggregate shape and packing properties. ...
  • Masina, Bathusile N; 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 ...
  • 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 ...
  • 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 ...

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