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Browsing by Author "Burger, L"

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Analysis of transverse field distributions in Porro prism resonators

Author: Litvin, IA ; Burger, L ; Forbes, A Date: 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 of loss are located ... Read more
Angular self-reconstruction of petal-like beams

Author: Litvin, IA ; Burger, L ; Forbes, A Date: Sep 2013 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 Letter, we offer a ... Read more
Digital control of laser modes with an intra-cavity spatial light modulator

Author: Ngcobo, Sandile ; Litvin, I ; Burger, L ; Forbes, A Date: Feb 2014 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 light modulator as a ... Read more
A digital laser for on-demand laser modes

Author: Ngcobo, Sandile ; Litvin, I ; Burger, L ; Forbes, A Date: Aug 2013 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 effort and suffer from ... Read more
The digital laser: on-demand laser modes with the click of a button

Author: Forbes, A ; Ngcobo, Sandile ; Burger, L ; Litvin, IA Date: Feb 2014 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 spatial light modulator. ... Read more
Digital mode selection using an intracavity SLM

Author: Burger, L ; Litvin, I ; Forbes, A Date: Jul 2012 We describe the performance of twisted nematic liquid crystal (TNLC) spatial light modulators (SLMs) when used for intracavity beam shaping. Read more
How to make a digital laser

Author: Burger, L ; Litvin, I ; Ngcobo, Sandile ; Forbes, A Date: Mar 2014 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 beams. For every ... Read more
Kaleidoscope modes in large aperture Porro prism resonators

Author: Burger, L ; Forbes, A Date: Aug 2008 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 output is in fact only ... Read more
Laser beam shaping limitations for laboratory simulation of turbulence using a phase-only spatial light modulator

Author: Litvin, IA ; Burger, L ; De Gama, MP ; Mathye, A ; Forbes, A Date: Sep 2007 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 of simulating ... Read more
Model of the transverse modes of stable and unstable porro–prism resonators using symmetry considerations

Author: Burger, L ; Forbes, A Date: 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 are the lowest−order ... Read more
Modeling laser brightness from cross porro prism resonators

Author: Forbes, A ; Burger, L ; Litvin, IA Date: Jul 2006 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 the beam quality ... Read more
Petal–like modes in Porro prism resonators

Author: Litvin, IA ; Burger, L ; Forbes, A Date: Oct 2007 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 which correctly ... Read more
Physical optics modeling of modal patterns in a crossed porro prism resonator

Author: Litvin, IA ; Burger, L ; Forbes, A Date: Jul 2006 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 with amplitude and phase ... Read more
Propagation of Porro "petal" beams through a turbulent atmosphere

Author: Burger, L ; Forbes, A Date: Jul 2009 Propagation of Porro "petal" beams through a turbulent atmosphere. Read more
Self-healing of Bessel-like beams with longitudinally dependent cone angles

Author: Litvin, I ; Burger, L ; Forbes, A Date: Sep 2015 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 a potentially infinite ... Read more
Simulating atmospheric turbulence using a phase-only spatial light modulator

Author: Burger, L ; Litvin, IA ; Forbes, A Date: Apr 2008 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 wavelengths in atmospheric ... Read more

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Browsing by Author "Burger, L"

Browsing by Author "Burger, L"

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All of ResearchSpace

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