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Browsing General science, engineering & technology by Author "Naidoo, Darryl"

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  • Naidoo, Darryl; Sroor, H; Litvin, I; Forbes, A (SPIE, 2019-09)
    The Higher order Poincar´e sphere (HOPS) is generally used to describe scalar and vector orbital angular momentum modes. These modes have found many applications to date; however, they are limited to low power levels. It ...
  • Naidoo, Darryl; Litvin, Ihar; Forbes, A (Optical Society of America, 2018-07)
    Laser brightness is a measure of the ability to deliver intense light to a target and encapsulates both the energy content and the beam quality. High-brightness lasers require that both parameters be maximized, yet standard ...
  • Naidoo, Darryl; Litvin, Ihar; Forbes, A (Optical Society of America, 2018-07)
    Laser brightness is a measure of the ability to deliver intense light to a target and encapsulates both the energy content and the beam quality. High-brightness lasers require that both parameters be maximized, yet standard ...
  • Dudley, Angela L; Naidoo, Darryl; Forbes, A (SPIE, 2016-09)
    We show how one can determine the various properties of light, from the modal content of laser beams to decoding the information stored in optical fields carrying orbital angular momentum, by performing a modal decomposition. ...
  • Naidoo, Darryl; Forbes, A; Aït-Ameur, K; Brunel, M (SPIE, 2011-01)
    An experimental approach in generating Petal-like transverse modes, which are similar to what is seen in porro-prism resonators, has been successfully demonstrated. We hypothesize that the petal-like structures are generated ...
  • Naidoo, Darryl; Roux, Filippus S; Dudley, Angela L; Litvin, Igor; Piccirillo, B; Marrucci, L; Forbes, A (Nature Publishing Group, 2016-03)
    The angular momentum of light can be described by positions on a higher-order Poincaré sphere, where superpositions of spin and orbital angular momentum states give rise to laser beams that have many applications, from ...
  • Naidoo, Darryl; Mafusire, C; Forbes, A (South African Institute of Physics, 2009-07)
    An optical aberration is a distortion of an image as compared to the object due to defects in an optical system
  • Hendriks, Adriaan J; Ramokolo, Lesiba R; Ngobeni, Christopher M; Moroko, Matome C; Naidoo, Darryl (2018-11)
    Additive manufacturing applications, in areas such as aerospace and medicine, are limited due to the lack of process stability and quality management. In particular, geometrical inaccuracies and the presence of mechanical ...
  • 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 ...
  • Litvin, IA; Ngcobo, S; Naidoo, Darryl; Ait-Ameur, K; Forbes, A (Optical Society of America, 2014-02)
    Laguerre–Gaussian beams with a nonzero azimuthal index are known to carry orbital angular momentum (OAM), and are routinely created external to laser cavities. The few reports of obtaining such beams from laser cavities ...
  • Sroor, H; Naidoo, Darryl; Miller, SW; Nelson, J; Courtial, J; Forbes, A (American Physical Society, 2019-01)
    Fractals, complex shapes with structure at multiple scales, have long been observed in Nature: as symmetric fractals in plants and sea shells, and as statistical fractals in clouds, mountains and coastlines. With their ...
  • Hendriks, A; Naidoo, Darryl; Roux, FS; Löpez-Mariscal, C; Forbes, A (SPIE, 2012-08)
    Phase-only spatial light modulators are now ubiquitous tools in modern optics laboratories, and are often used to generate so-called structured light. In this work we outline the use of a phase-only spatial light modulator ...
  • Ait-Ameur, K; Naidoo, Darryl; Ngcobo, S; Fromager, M; Litvin, I; Hasnaoui, A; Harfouche, A; Forbes, A (SPIE, 2015-02)
    A great number of laser applications need in place of the usual Gaussian beam a flat-top intensity profile in the focal plane of a focusing lens. In general the transformation of the laser beam from the Gaussian to the ...
  • Naidoo, Darryl; Litvin, Ihar; Forbes, A (SPIE, 2017-02)
    We investigate the selection of a flat-top beam and a Gaussian beam inside a laser cavity on opposing mirrors. The concept is tested external to the laser cavity in a single pass and double pass regime where the latter ...
  • Naidoo, Darryl; Forbes, A; Aït-Ameur, K; Fromager, M (SPIE, 2011-01)
    A method of decomposing a dual-directional laser beam into a forward propagating field and a backward propagating field for an apertured plano-concave cavity is presented. An intra-cavity aperture is a simple method of ...
  • Naidoo, Darryl; Aït-Ameur, K; Brunel, M; Forbes, A (Springer Verlag, 2012)
    In this paper we demonstrate experimentally the intra-cavity generation of a coherent superposition of Laguerre–Gaussian modes of zero radial order but opposite azimuthal order. The superposition is created with a simple ...
  • Naidoo, Darryl; Litvin, I; Laskin, A; Forbes, A (SPIE Proceedings, 2014-02)
    We explore an intra-cavity beam shaping approach to generate a Gaussian distribution by the metamorphosis of a Gaussian beam into a flat-top distribution on opposing mirrors. The concept is tested external to the cavity ...
  • Naidoo, Darryl; Aït-Ameur, K; Forbes, A (SPIE, 2011-08)
    In this paper the authors explore vortex beams and in particular the generation of single LG0l modes and superpositions thereof. Vortex beams carry orbital angular momentum (OAM) and this intrinsic property makes them ...
  • 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 ...
  • 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 ...

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