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Browsing by Author "Fromager, M"

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Generation of shape-invariant flat-top laser beams

Author: Ait-Ameur, K ; Naidoo, Darryl ; Ngcobo, Sandile ; Fromager, M ; Litvin, I ; Hasnaoui, A ; Harfouche, A ; Forbes, A Date: Feb 2015 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 flat-top shape is made ... Read more
Intra-cavity decomposition of a dual-directional laser beam

Author: Naidoo, Darryl ; Forbes, A ; Aït-Ameur, K ; Fromager, M Date: Jan 2011 A method of decomposing a dual-directional laser beam into a forward propagating field and a backward propagating field for an apertured plano-concave cavity is presented. An intra-cavity aperture is a simple method of laser beam shaping as ... 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
Selection of a LGp0-shaped fundamental mode in a laser cavity: Phase versus amplitude masks

Author: Hasnaoui, A ; Godin, T ; Cagniot, E ; Fromager, M ; Forbes, A ; Ait-Ameur, K Date: 2012 Laser beams of a single high-order transverse mode have been of interest to the laser community for several years now. In order to achieve such a mode as the fundamental mode of the cavity, mode selecting elements in the form of a phase or ... 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
Spatial superpositions of Gaussian beams

Author: Naidoo, Darryl ; Godin, T ; Fromager, M ; Aït-Ameur, K ; Forbes, A Date: Feb 2014 We explore an interferometric beam shaping technique that considers the coaxial superposition of two Gaussian beams. This technique is traditionally implemented in a Mach-Zehnder interferometer; however, to avoid phase shift drift due to ... Read more
Strong reducing of the laser focal volume

Author: Godin, T ; Ngcobo, Sandile ; Cagniot, E ; Fromager, M ; Forbes, A ; Aït-Ameur, K Date: Aug 2011 Many applications of lasers seek nowadays for focal spots whose corresponding volume is getting smaller and smaller in order to ensure high spatial resolution. This problem, studied by many research groups around the world, is the core of ... 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

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Browsing by Author "Fromager, M"

Browsing by Author "Fromager, M"

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