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Browsing by Author "Burger, L"

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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 ...
  • 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 ...
  • 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.
  • 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 ...
  • Burger, L; Forbes, A (Optical Society of America, 2008-08)
    The authors apply a new method of modeling Porro prism resonators, using the concept of rotating loss screens, to study stable and unstable Porro prism resonator. They show that the previously observed petal–like modal ...
  • 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 ...
  • Burger, L; Forbes, A (International Society for Optical Engineering (SPIE), 2007)
    A simple model of a Porro prism laser resonator has been found to correctly predict the formation of the “petal” mode patterns typical of these resonators. A geometrical analysis of the petals suggests that these petals ...
  • 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 ...
  • Litvin, IA; Burger, L; Forbes, A (Optical Society of America, 2007-10)
    A new approach to modeling the spatial intensity profile from Porro prism resonators is proposed based on rotating loss screens to mimic the apex losses of the prisms. A numerical model based on this approach is presented ...
  • Litvin, IA; Burger, L; Forbes, A (2006-07)
    A physical optics model is proposed to describe the transverse modal patterns in crossed Porro prism resonators. The model departs from earlier attempts in that the prisms are modeled as non-classical rotating elements ...
  • Burger, L; Forbes, A (South African Institute of Physics (SAIP), 2009-07)
    Propagation of Porro "petal" beams through a turbulent atmosphere.
  • 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 ...
  • Burger, L; Litvin, IA; Forbes, A (2008-04)
    Demonstration of the effect of atmospheric turbulence on the propagation of laser beams is traditionally a difficult task. This is due to the complexities of long-distance measurements and the scarcity of suitable laser ...