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Browsing by Author "Ngcobo, S"

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  • Ngcobo, S; Litvin, I; Burger, L; Forbes, A (SPIE Proceedings, 2014-02)
    In this paper we outline a simple laser cavity which produces customised on-demand digitally controlled laser modes by replacing the end-mirror of the cavity with an electrically addressed reflective phase-only spatial ...
  • Ngcobo, S; Litvin, I; Burger, L; Forbes, A (Nature Publishing Group, 2013-08)
    Customizing the output beam shape from a laser invariably involves specialized optical elements in the form of apertures, diffractive optics and free-form mirrors. Such optics require considerable design and fabrication ...
  • Forbes, A; Ngcobo, S; Burger, L; Litvin, IA (SPIE, 2014-02)
    In this paper we will outline our recent advances in all-digital control of light. Importantly, we will outline how to create a so-called “digital laser”, where a conventional laser mirror is replaced with a phase-only ...
  • 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 ...
  • Mthunzi, P; He, K; Ngcobo, S; Warner, JW (SPIE, 2014-02)
    Literature reports graphene, an atomic-thick sheet of carbon atoms as one of the promising biocompatible scaffolds that promotes cellular proliferation in human mesenchymal stem cells. On the other hand, different mammalian ...
  • Ngcobo, S; Ait-Ameur, K; Forbes, A (2012-07)
    This work deals with the generation of symmetrical high order Laguerre Gaussian modes. These high order Laguerre-Gaussian beams are generated by forcing the laser using an annular binary Diffractive Optical Element whose ...
  • 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 ...
  • Mthunzi, P; He, K; Ngcobo, S; Khanyile, T; Warner, JH (Wiley-VCH Verlag, 2014-05)
    Pluripotent stem cells are hugely attractive in the tissue engineering research field as they can self-renew and be selectively differentiated into various cell types. For stem cell and tissue engineering research it is ...
  • Khanyile, T; He, K; Ngcobo, S; Warner, JH; Mthunzi, P (CSIR, 2013-09)
    Studies directed at investigating the role of nanomaterial substrates with varying properties in tissue engineering research are essential. In this research arena, pluripotent stem cells are popular for their self renewing ...
  • Ngcobo, S; Forbes, A; Ait-Ameur, K (2012-07)
    The transformation of a single mode TEM00 Gaussian beam by forcing the laser to operate into a symmetrical single mode higher order TEMp0 Laguerre Gaussian beam intensity distribution is very useful in improving and ...
  • Burger, L; Litvin, I; Ngcobo, S; Forbes, A (SPIE, 2014-03)
    The beam from a laser resonator is determined by the optical elements it contains. Most commonly, these consist of two spherical mirrors, but phase- and amplitude-modulating elements can also be included to produce custom ...
  • Ngcobo, S; Ait-Ameur, K; Forbes, A (2012-08)
    This work deals with the generation of symmetrical high order Laguerre Gaussian modes. These high order Laguerre-Gaussian beams are generated by forcing the laser using an annular binary Diffractive Optical Element whose ...
  • 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 ...
  • Ngcobo, S; Bollig, C; Von Bergmann, H (2010-09)
    A Nd: YVO4 modelocked laser has been constructed using a resonator designed according to the theoretical parameters. The laser produced pulses in the picosecond region with a maximum average output power of 2.8W. Passive ...
  • Godin, T; Ngcobo, S; Cagniot, E; Fromager, M; Forbes, A; Aït-Ameur, K (SPIE, 2011-08)
    Many applications of lasers seek nowadays for focal spots whose corresponding volume is getting smaller and smaller in order to ensure high spatial resolution. This problem, studied by many research groups around the world, ...
  • Ngcobo, S; Forbes, A; Ait-Ameur, K; Mhlanga, T (2012-07)
    The transformation of a Gaussian beam into a symmetrical TEMp0 Laguerre Gaussian beam (LGB) intensity distribution which has transverse superresolution properties is very useful in improving the spatial resolution of optical ...
  • Ngcobo, S; Ait-Ameur, K; Forbes, A (2011-11)
    The transformation of a Gaussian beam (GB) into a symmetrical higher order TEMp0 Laguerre Gaussian beam (LGB) intensity distribution of which is further rectified and transformed into a Gaussian intensity distribution in ...
  • Ngcobo, S; Ait-Ameur, K; Litvin, I; Hasnaoui, A; Forbes, A (Optical Society of America, 2013-09)
    We outline a simple laser cavity comprising an opaque ring and a circular aperture that is capable of producing spatially tuneable laser modes, from a Gaussian beam to a Flat-top beam. The tuneability is achieved by varying ...
  • Ngcobo, S; Ait-Ameur, K; Litvin, I; Hasnaoui, A; Forbes, A (SPIE Proceedings, 2014-02)
    In this paper we experimentally demonstrate a simple laser cavity that produces spatial tuneable laser modes from a Gaussian beam to a Flat-top beam and a Donut-beam. The laser cavity contains an opaque ring and an adjustable ...
  • Forbes, A; Schulze, C; Ngcobo, S; Flamm, D; Naidoo, Darryl; Dudley, Angela L; Duparre, M (SPIE Proceedings, 2013-02)
    Modal decomposition of optical fields as a concept has been in existence for many decades, yet despite its clear applications to laser beam analysis it has nevertheless remained a seldom used tool. With the commercialization ...