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Browsing by Author "Litvin, I"

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  • 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 ...
  • 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 ...
  • 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 ...
  • Burger, L; Litvin, I; Forbes, A (SAIP, 2012-07)
    We describe the performance of twisted nematic liquid crystal (TNLC) spatial light modulators (SLMs) when used for intracavity beam shaping.
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Dudley, Angela L; Schulze, C; Litvin, I; Duparré, M; Forbes, A (SPIE Proceedings, 2013-08)
    Although many techniques are efficient at measuring optical orbital angular momentum (OAM), they do not allow one to obtain a quantitative measurement for the OAM density across an optical field and instead only measure ...
  • Litvin, I; Burger, L; Forbes, A (IOP Publishing, 2015-09)
    Bessel beams have been extensively studied, but to date have been created over a finite region inside the laboratory. Recently Bessel-like beams with longitudinally dependent cone angles have been introduced allowing for ...
  • Forbes, A; Long, C; Loveday, P; Litvin, I (Academy of Science for South Africa, 2010)
    Modern micro-optical elements and adaptive mirrors exploit diffraction to shape light inside a laser.
  • 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 ...