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Browsing by Author "Forbes, A"

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  • 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.
  • Schulze, C; Flamm, D; Dudley, Angela L; Forbes, A; Duparr'e, M (SPIE Digital library, 2013-02)
    We present a novel technique to measure the orbital angular momentum (OAM) density of light. The technique is based on modal decomposition, enabling the complete reconstruction of optical fields, including the reconstruction ...
  • Schulze, C; Ngcobo, S; Duparre, M; Forbes, A (Optical Society of America, 2012-12)
    The modal decomposition of an arbitrary optical field may be done without regard to the spatial scale of the chosen basis functions, but this generally leads to a large number of modes in the expansion. While this may be ...
  • Flamm, D; Naidoo, Darryl; Schulze, C; Forbes, A; Duparré, M (Optical Society of America, 2012-07)
    A procedure for the real-time analysis of laser modes using a phase-only spatial light modulator is outlined. The procedure involves encoding into digital holograms by complex amplitude modulation a set of orthonormal basis ...
  • Burger, L; Forbes, A (International Society for Optical Engineering (SPIE), 2007)
    A simple model of a Porro prism laser resonator has been found to correctly predict the formation of the “petal” mode patterns typical of these resonators. A geometrical analysis of the petals suggests that these petals ...
  • Forbes, A; Burger, L; Litvin, IA (2006-07)
    Laser brightness is a parameter often used to compare high power laser beam delivery from various sources, and incorporates both the power contained in the particular mode, as well as the propagation of that mode through ...
  • Loveday, PW; Long, CS; Forbes, A; Land, K (South African Conference on Computational and Applied Mechanics, 2008-03)
    An intra-cavity adaptive mirror is required to compensate for time-dependent phase aberrations to the laser beam, such as those caused by thermal lensing. A piezoelectric unimorph design can provide a small, low-cost ...
  • Gailele, Lucas M; Maweza, Elijah L; Dudley, Angela L; Ndagano, B; Rosales-Guzman, C; Forbes, A (SPIE, 2017-02)
    Traditional optical communication systems optimize multiplexing in polarization and wavelength both transmitted in fiber and free-space to attain high bandwidth data communication. Yet despite these technologies, we are ...
  • Michaelis, MM; Forbes, A; Conti, A; Nativel, N; Bencherif, H; Bingham, R; Kellett, B; Govender, K (The International Society for Optical Engineering, 2006-06-14)
    Non-solid and non-rigid optics employ gas and liquid transmission and reflection, as well as flexible membranes to influence laser beams, laser driven particle beams and harmonic generators. Some examples are acoustic ...
  • Long, CS; Loveday, PW; Forbes, A; Land, K (SACAM 2010, 2010-01)
    For intra-cavity laser beam control, a small, low-cost deformable mirror is required. This mirror can be used to correct for time- dependent phase aberrations to the laser beam, such as those caused by thermal expansion ...
  • Naidoo, Darryl; Ait-Ameur, K; Litvin, I; Fromager, M; Forbes, A (Deutsche Physikalische Gesellschaft, 2012-05)
    The mode inside a laser cavity may be understood as the interference of two counter-propagating waves, referred to as the forward and backward waves, respectively. We outline a simple experimental procedure, which does not ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (2010-08)
    Gas lenses work on the basis that aerodynamic media can be used to generate a graded refractive index distribution which can be used to focus a laser beam. Examples of these are the spinning pipe gas lens (SPGL) and the ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (Optical Society of America, 2008-06)
    If a heated pipe is rotated about its axis, a density gradient is formed which results in the pipe acting as a graded index lens. In this study the authors revisit the concept of a spinning pipe gas lens and for the first ...