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Browsing by Author "Litvin, IA"

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  • Litvin, IA; Burger, L; Forbes, A (The International Society for Optical Engineering, 2007)
    A model to describe the transverse field distribution of the output beam from porro prism resonators is proposed. The model allows the prediction of the output transverse field distribution by assuming that the main areas ...
  • Litvin, IA; Burger, L; Forbes, A (OSA Publishing, 2013-09)
    The self-reconstruction of superpositions of Laguerre–Gaussian (LG) beams has been observed experimentally, but the results appear anomalous and without a means to predict under what conditions this take place. In this ...
  • 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 ...
  • Litvin, IA (Optical Society of America, 2012-06)
    In this work we investigate the behavior of the instantaneous Poynting vector of symmetrical paraxial laser beams, namely the modification of the instantaneous Poynting vector and the radiation pattern during propagation ...
  • Litvin, IA; Forbes, A (Elsevier Science B.V. Amsterdam., 2008-05)
    The authors investigate a conventional resonator configuration, using only spherical curvature optical elements, for the generation of Bessel–Gauss beams. This is achieved through the deployment of a suitable amplitude ...
  • 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 ...
  • Litvin, IA; Forbes, A (The International Society for Optical Engineering, 2005)
    Bessel beams have gathered much interest of late due to their properties of near diffraction free propagation and self reconstruction after obstacles. Such laser beams have already found applications in fields such as ...
  • Litvin, IA; Forbes, A (Optical Society of America, 2009-10)
    The authors outline a resonator design that allows for the selection of a Gaussian mode by diffractive optical elements. This is made possible by the metamorphosis of a Gaussian beam into a flat-top beam during propagation ...
  • Forbes, A; Du Preez, N; Litvin, IA; Botha, LR (South African Institute of Physics (SAIP), 2009-07)
    Generation and application of high power flattened Gaussian beams. Presented at the 54th Annual Conference of the South African Institute of Physics (SAIP) 2009.
  • Litvin, IA; Forbes, A (International Society for Optical Engineering (SPIE), 2007)
    The authors investigate the phase conjugating element of a two element Fourier transform beam shaping scheme and the impact this element has on the resulting propagation. It is shown that there are stricter limitations ...
  • Litvin, IA (Taylor & Francis, 2012-02)
    In this work the author proposes an implementation of a new intra-cavity beam shaping technique to vary the intensity distribution of the fundamental mode in a resonator cavity while maintaining a constant intensity ...
  • Litvin, IA; Khilo, NA; Forbes, A; Belyi, VN (Society of Photo-Optical Instrumentation Engineers, 2009-08)
    In this paper the researchers report on two resonator systems for producing LDBLBs with arbitrary initial parameters. First resonator system is based on doublet of divergence and convergence lenses with spherical aberration. ...
  • Litvin, IA; Loveday, PW; Long, CS; Kazak, NS; Belyi, V; Forbes, A (Society of Photo-Optical Instrumentation Engineers (SPIE), 2008-08)
    There are many applications in which a laser beam with a flat–top intensity profile would be ideal, as compared to a laser beam with a non–uniform energy distribution. Standard stable optical resonators will unfortunately ...
  • Litvin, IA; Forbes, A (Society of Photo-Optical Instrumentation Engineers, 2009-08)
    In this paper the authors present the analytical and numerical analyses of two new resonator systems for generating flat–top–like beams. Both approaches lead to closed form expressions for the required cavity optics, but ...
  • Litvin, IA; Khilo, NA; Forbes, A; Belyi, VN (Optical Society of America, 2010-02)
    The authors report on two resonator systems for producing Bessel–like beams with longitudinally dependent cone angles (LDBLBs). Such beams have extended propagation distances as compared to conventional Bessel– Gauss beams, ...
  • Litvin, IA (2006-07)
    Numerical calculations of the phase velocities of collective modes of a hollow waveguide at the Stokes frequency is carried out. The self- imaging of transverse structure of modes superposition (Talbot effect) is investigated. ...
  • Litvin, IA; Burger, L; De Gama, MP; Mathye, A; Forbes, A (International Society for Optical Engineering (SPIE)., 2007-09)
    Recent approaches to demonstrating adaptive optics and atmospheric turbulence have made use of spatial light modulators (SLMs) as the active phase element. However, there are limitations in using SLMs as an accurate method ...
  • Litvin, IA; Stepanov, BI (The International Society for Optical Engineering, 2006-08)
    In this work the mode structure of a resonator with Bessel – Gauss transverse mode distribution was investigated. Under some configuration of like resonators, the authors have found that diffraction losses in high mode ...
  • Forbes, A; Burger, L; Litvin, IA (2006-07)
    Laser brightness is a parameter often used to compare high power laser beam delivery from various sources, and incorporates both the power contained in the particular mode, as well as the propagation of that mode through ...