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Browsing by Author "Ait-Ameur, K"

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  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Hasnaoui, A; Godin, T; Cagniot, E; Fromager, M; Forbes, A; Ait-Ameur, K (Elsevier, 2012)
    Laser beams of a single high-order transverse mode have been of interest to the laser community for several years now. In order to achieve such a mode as the fundamental mode of the cavity, mode selecting elements in the ...
  • 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 ...