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Browsing by Author "Dudley, A"

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  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Giovannini, D; Romero, J; Leach, J; Dudley, Angela L; Forbes, A; Padgett, MJ (American Physical Society, 2013-04)
    Mutually unbiased bases (MUBs) play a key role in many protocols in quantum science, such as quantum key distribution. However, defining MUBs for arbitrary high-dimensional systems is theoretically difficult, and measurements ...
  • Dudley, Angela L; Litvin, I; Roux, FS; Forbes, A (SPIE Digital library, 2013-02)
    By using digital holograms, we present a simple technique for performing a complete azimuthal decomposition of an arbitrary laser mode. The match-filter, used to perform the azimuthal decomposition, is bounded by an annular ...
  • Dudley, Angela L; Schulze, C; Roux, FS; Duparré, M; Forbes, A (2013-06)
    In this work we present a mechanism for generating superpositions of non-canonical, higherorder Bessel beams, which are characterized by the anisotropy of the optical vortex on the propagation axis, known as the morphology ...
  • Dudley, Angela L; Vasilyeu, R; Belyi, V; Khilo, N; Ropot, P; Forbes, A (Elsevier, 2011-09)
    In this work we investigate the structure of nondiffracting speckle fields, both experimentally and theoretically. We are able to produce very good agreement between the experimentally recorded and theoretically calculated ...
  • Dudley, Angela L; Li, Y; Mhlanga, T; Escuti, M; Forbes, A (2013-07)
    This is a paper presented on creating and decomposing vector Bessel beams, presented at the 58th annual SAIP conference.
  • Mhlanga, T; Trichili, A; Dudley, Angela L; Naidoo, Darryl; Zghal, M; Forbes, A (SPIE, 2014-10-02)
    High-capacity data transmission has been implemented using single channel optical systems. This technique is limited and soon it will be unable to ful ll the growing needs for higher bit rate data transmission. Hence multi-mode ...
  • Dudley, Angela L; Forbes, A (2014-05)
    This study reports on the presentation of the second international conference on applications of optics and photonics: Digitally controlling the ‘twist’ of light.
  • Spangenberg, D-M; Dudley, Angela L; Neethling, P; Forbes, A; Rohwer, E (SPIE Proceedings, 2013-08)
    SLMs used for spatial modulation of lasers are often used in conjunction with very narrow bandwidth laser light where diffractive dispersion could be approximated as a constant. It is known that diffractive dispersion is ...
  • Dudley, Angela L; Mhlanga, T; Lavery, M; McDonald, A; Roux, FS; Padget, M; Forbes, A (Optical Society of America, 2013-01)
    We demonstrate the efficient sorter of Bessel beams separating both the azimuthal and radial components. This is based upon the recently reported transformation of angular to transverse momentum states. We separately ...
  • Mhlanga, T; Dudley, Angela L; McDonald, A; Roux, FS; Lavery, M; Padgett, M; Forbes, A (SPIE Digital llibrary, 2013-02)
    A procedure to efficiently sort orbital angular momentum (OAM) states of light, by performing a Cartesian to log-polar coordinate transformation which translates helically phased beams into a transverse phase gradient, ...
  • Trichili, A; Dudley, Angela L; Salem, AB; Ndagano, B; Zghal, M; Forbes, A (SPIE, 2015-08)
    The authors experimentally demonstrate an information encoding protocol using the two degrees of freedom of Laguerre Gaussian modes having different radial and azimuthal components. A novel method, based on digital holography, ...