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Browsing by Author "Forbes, A"

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  • Trichili, A; Mhlanga, T; Naidoo, Darryl; Dudely, A; Zghal, M; Forbes, A (SPIE, 2014-08-17)
    We analyze the effect of atmospheric turbulence on the propagation of multiplexed Laguerre Gaussian modes. We present a method to multiplex Laguerre Gaussian modes using digital holograms and decompose the resulting field ...
  • Forbes, A; Schulze, C; Flamm, D; Dudley, Angela L; Duparre, M (Optical Society of America, 2013-04)
    We show how laser beam characterization may be done in real-time with digital holograms. We illustrate the power of the techniques by applying them to a variety of laser sources, from fibers to solid-state.
  • Forbes, A (2006-08)
    Many analytical techniques exist to explore the propagation of certain laser beams in free space, or in a linearly absorbing medium. When the medium is nonlinearly absorbing the propagation must be described by an iterative ...
  • Masina, BN; Bodkin, R; Mwakikunga, B; Forbes, A (SPIE, 2011-08)
    This paper presents an implementation of a laser beam shaping system for both heating a diamond tool and measuring the resulting temperature optically. The influence the initial laser parameters have on the resultant ...
  • Litvin, IA; Burger, L; De Gama, MP; Mathye, A; Forbes, A (International Society for Optical Engineering (SPIE)., 2007-09)
    Recent approaches to demonstrating adaptive optics and atmospheric turbulence have made use of spatial light modulators (SLMs) as the active phase element. However, there are limitations in using SLMs as an accurate method ...
  • Forbes, A; Lizotte, TE (SPIE, 2012-09)
    Full content of the proceedings of the Laser Beam Shaping XIII conference held in San Diego, California, United States.
  • Michaelis, MM; Forbes, A; Klopper, W; Bencherif, H; Jolivet, S; Moorgawa, R; McKenzie, E; Turner, G (Academy of Science of South Africa, 2006-07)
    Three sets of laser propulsion experiments have been conducted in South Africa. The first, on the MLIS kilowatt CO2 laser at Pelindaba, gave a surprisingly good result but could not be repeated after the laser chain was ...
  • Michaelis, MM; Forbes, A (Academy of Science of South Africa, 2006-07)
    Early proposals for laser propulsion were surveyed. Propulsion theory and laboratory momentum coupling experiments demonstrate how it is possible to choose the target material so as to optimize payload efficiency, with a ...
  • Michaelis, MM; Forbes, A; Bingham, R; Kellett, BJ; Mathye, A (SPIE, 2008-04)
    A variety of laser applications in space, past, present, future and far future are reviewed together with the contributions of some of the scientists and engineers involved, especially those that happen to have South African ...
  • Forbes, A; Masina, B (2010-11)
    In this article the authors outline how an all-optical system may be designed for the heating, and then subsequent temperature measurement, of any sample, thus allowing a non-contact approach to thermal studies of materials
  • Ismail, Y; Barnes, G; Mhlanga, T; Belyi, V; Forbes, A (2010-03)
    In this paper the authors outline an optical design for producing high-order Bessel-like beams with a z-dependent cone angle through the use of conventional optical elements, without the need for deliberate aberrations to ...
  • Schulze, C; Dudley, Angela L; Brüning, R; Duparré, M; Forbes, A (Optical Society of America, 2014-09)
    We present the measurement of the orbital angular momentum (OAM) density of Bessel beams and superpositions thereof by projection into a Laguerre–Gaussian basis. This projection is performed by an all-optical inner product ...
  • Schulze, C; Dudley, Angela L; Flamm, D; Duparre, M; Forbes, A (IOP Publishing, 2013-07)
    We demonstrate a versatile method for the measurement of the orbital angular momentum (OAM) density of an optical field. By performing a modal decomposition with digital holograms, we reconstruct the full optical field ...
  • Mudau, AE; Mwakikunga, BW; Brink, N; Willers, CJ; Forbes, A; Shikwambana, L; Govender, M (SAIP 2010, 2010-09)
    In laser pyrolysis, temperature measurement and control plays a vital role during the development of nanoparticles. Authors present the results of temperature measurements using infrared camera on a tungsten hexa-ethoxide ...
  • McLaren, MG; Forbes, A; Sideras-Haddad, E (South African Institute of Physics (SAIP), 2009-07)
    Measuring microscopic forces and torques using optical tweezers, presented at the 54th Annual Conference of the South African Institute of Physics in 2009
  • Dudley, Angela L; Milione, G; Alfano, R; Forbes, A (CSIR, 2014-07)
    The presentation focuses on how horizontal and vertical components of a field can be extracted via Stokes polarimetry
  • Dudley, Angela L; Litvin, I; Forbes, A (SPIE, 2012-01)
    To measure the Orbital Angular Momentum (OAM) density of superposition fields two steps are needed: generation and measurement. An azimuthally-varying phase (bounded by a ring-slit) placed in the spatial frequency domain ...
  • Milione, G; Dudley, Angela L; Nguyen, TA; Chakraborty, O; Karimi, E; Forbes, A; Alfano, RR (IOP Publishing, 2015-02)
    We experimentally measured the self-healing of the spatially inhomogeneous states of polarization of vector Bessel beams. Radially and azimuthally polarized vector Bessel beams were experimentally generated via a digital ...
  • Milione, G; Dudley, Angela L; Nguyen, TA; Chakraborty, O; Karimi, E; Forbes, A; Alfano, R (IOP Publishing, 2015-02)
    We experimentally measured the self-healing of the spatially inhomogeneous states of polarization of vector Bessel beams. Radially and azimuthally polarized vector Bessel beams were experimentally generated via a digital ...
  • Dudley, Angela L; Nock, M; Konrad, T; Roux, FS; Forbes, A (Optical Society of America, 2010-10)
    An amplitude damping channel for Laguerre-Gaussian (LG) modes is presented. Experimentally the action of the channel on LG modes is in good agreement with that predicted theoretically.