Browsing Journal Articles by Author "Naidoo, Darryl"

Now showing items 1-14 of 14

Brightness enhancement in a solid-state laser by mode transformation

Author: Naidoo, Darryl ; Litvin, Ihar ; Forbes, A Date: Jul 2018 Laser brightness is a measure of the ability to deliver intense light to a target and encapsulates both the energy content and the beam quality. High-brightness lasers require that both parameters be maximized, yet standard laser cavities do ... Read more
Brightness enhancement in a solid-state laser by mode transformation

Author: Naidoo, Darryl ; Litvin, Ihar ; Forbes, A Date: Jul 2018 Laser brightness is a measure of the ability to deliver intense light to a target and encapsulates both the energy content and the beam quality. High-brightness lasers require that both parameters be maximized, yet standard laser cavities do ... Read more
Constructing “petal” modes from the coherent superposition of Laguerre-Gaussian modes

Author: Naidoo, Darryl ; Forbes, A ; Aït-Ameur, K ; Brunel, M Date: Jan 2011 An experimental approach in generating Petal-like transverse modes, which are similar to what is seen in porro-prism resonators, has been successfully demonstrated. We hypothesize that the petal-like structures are generated from a coherent ... Read more
Controlled generation of higher-order Poincaré sphere beams from a laser

Author: Naidoo, Darryl ; Roux, Filippus S ; Dudley, Angela L ; Litvin, Igor ; Piccirillo, B ; Marrucci, L ; Forbes, A Date: Mar 2016 The angular momentum of light can be described by positions on a higher-order Poincaré sphere, where superpositions of spin and orbital angular momentum states give rise to laser beams that have many applications, from microscopy to materials ... Read more
Doughnut laser beam as an incoherent superposition of two petal beams

Author: Litvin, IA ; Ngcobo, Sandile ; Naidoo, Darryl ; Ait-Ameur, K ; Forbes, A Date: Feb 2014 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 suffer from inconclusive ... Read more
Fractal light from lasers

Author: Sroor, H ; Naidoo, Darryl ; Miller, SW ; Nelson, J ; Courtial, J ; Forbes, A Date: Jan 2019 Fractals, complex shapes with structure at multiple scales, have long been observed in Nature: as symmetric fractals in plants and sea shells, and as statistical fractals in clouds, mountains and coastlines. With their highly polished spherical ... Read more
Intra-cavity generation of superpositions of Laguerre-Gaussian beams

Author: Naidoo, Darryl ; Aït-Ameur, K ; Brunel, M ; Forbes, A Date: 2012 In this paper we demonstrate experimentally the intra-cavity generation of a coherent superposition of Laguerre–Gaussian modes of zero radial order but opposite azimuthal order. The superposition is created with a simple intra-cavity stop ... Read more
Mode analysis with a spatial light modulator as a correlation filter

Author: Flamm, D ; Naidoo, Darryl ; Schulze, C ; Forbes, A ; Duparré, M Date: Jul 2012 A procedure for the real-time analysis of laser modes using a phase-only spatial light modulator is outlined. The procedure involves encoding into digital holograms by complex amplitude modulation a set of orthonormal basis functions into ... Read more
Observing mode propagation inside a laser cavity

Author: Naidoo, Darryl ; Ait-Ameur, K ; Litvin, I ; Fromager, M ; Forbes, A Date: May 2012 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 require any additional ... Read more
Purity of vector vortex beams through a birefringent amplifier

Author: Sroor, H ; Lisa, Nyameko ; Naidoo, Darryl ; Litvin, Ihar ; Forbes, A Date: Apr 2018 Creating high-quality vector vortex (VV) beams is possible with a myriad of techniques at low power, and while a few studies have produced such beams at high power, none have considered the impact of amplification on the vector purity. Here ... Read more
Spatial properties of coaxial superposition of two coherent Gaussian beams

Author: Boubaha, B ; Naidoo, Darryl ; Godin, T ; Fromager, M ; Forbes, A ; Aït-Ameur, K Date: Aug 2013 In this paper, we explore theoretically and experimentally the laser beam shaping ability resulting from the coaxial superposition of two coherent Gaussian beams (GBs). This technique is classified under interferometric laser beam shaping ... Read more
Transverse correlation vanishing due to phase aberrations

Author: Godin, T ; Forbes, A ; Naidoo, Darryl ; Fromager, M ; Cagniot, E ; Aït-Ameur, K Date: Jun 2011 The concept of transverse correlation vanishing, between the fraction of power contained in the centre and wings of a probe beam, recently introduced [Opt. Commun. 282 (2009) 3854–3858] is important to be considered when measuring the effective ... Read more
Transverse mode selection in a monolithic microchip laser

Author: Naidoo, Darryl ; Godin, T ; Fromager, M ; Cagniot, E ; Passilly, N ; Forbes, A ; Aït-Ameur, K Date: Nov 2011 The article outlines an approach to mode selection in a microchip laser through judicious shaping of the pump light to create a high modal overlap with the desired mode. The authors demonstrate the principle by creating a donut-shaped pump ... Read more
Wavefront reconstruction by modal decomposition

Author: Schulze, C ; Naidoo, Darryl ; Flamm, D ; Schmidt, OA ; Forbes, A ; Duparr, M Date: Aug 2012 We propose a new method to determine the wavefront of a laser beam based on modal decomposition by computer-generated holograms. The hologram is encoded with a transmission function suitable for measuring the amplitudes and phases of the modes ... Read more

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Browsing Journal Articles by Author "Naidoo, Darryl"

Browsing Journal Articles by Author "Naidoo, Darryl"

Browse

All of ResearchSpace

This Collection

Quick Links

Legislation and compliance

General Enquiries

Social Connect