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Browsing by Subject "Laser beam shaping"

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Amplification of higher-order Poincaré sphere beams

Author: Naidoo, Darryl ; Sroor, H ; Litvin, I ; Forbes, A Date: Sep 2019 The Higher order Poincar´e sphere (HOPS) is generally used to describe scalar and vector orbital angular momentum modes. These modes have found many applications to date; however, they are limited to low power levels. It has thus become topical ... 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
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
Controllable beam shaping of coherent and incoherent beams by a laser amplifier

Author: Litvin, Ihar ; King, Gary R Date: Aug 2018 We propose the technique for a controllable manipulation of the transverse intensity distribution of an output beam by the temporal adjustment of a transverse gain profile in a laser amplifier. It was created by an independent manipulation ... Read more
Creation and detection of optical modes with spatial light modulators

Author: Forbes, A ; Dudley, Angela L ; McLaren, M Date: Jun 2016 Modal decomposition of light has been known for a long time, applied mostly to pattern recognition. With the commercialization of liquid-crystal devices, digital holography as an enabling tool has become accessible to all, and with it all-digital ... 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
Digital generation of shape-invariant Bessel-like beams

Author: Litvin, Igor A ; Collet, Oliver JP Date: Mar 2015 We propose a new technique for laser beam shaping namely the reshaping of the laser beam into a desirable beam profile by the use of a laser amplifier with a pump beam that has a modified intensity profile. We developed the analytical formula ... Read more
Generating superpositions of higher order bessel beams [Conference paper]

Author: Vasilyeu, R ; Dudley, Angela L ; Khilo, N ; Forbes, A Date: Oct 2009 An experimental setup to generate a superposition of higher-order Bessel beams by means of a spatial light modulator and ring aperture is presented. The experimentally produced fields are in good agreement with those calculated theoretically. Read more
Higher-order Bessel like beams with z-dependent cone angles

Author: Ismail, Y ; Barnes, G ; Mhlanga, T ; Belyi, V ; Forbes, A Date: Aug 2010 As in the case of zero-order Bessel beam being produced by illuminating an axicon with a Gaussian beam, higher-order Bessel beams are generated by substituting the Gaussian beam with a Laguerre Gaussian (LG) beam. These beams hold similar ... Read more
Laser beam characterization with digital holograms

Author: Forbes, A ; Schulze, C ; Flamm, D ; Dudley, Angela L ; Duparre, M Date: Apr 2013 We show how laser beam characterization may be done in real-time with digital holograms. We illustrate the power of the techniques by applying them to a variety of laser sources, from fibers to solid-state. Read more
Laser beam shaping for studying thermally induced damage

Author: Masina, Bathusile N ; Bodkin, R ; Mwakikunga, Bonex W ; Forbes, A Date: Aug 2011 This paper presents an implementation of a laser beam shaping system for both heating a diamond tool and measuring the resulting temperature optically. The influence the initial laser parameters have on the resultant temperature profiles is ... Read more
Optical trapping with Super-Gaussian beams

Author: McLaren, M ; Khanyile, T ; Mthunzi-Kufa, Patience ; Forbes, A Date: Apr 2013 We outline the possibility of optical trapping and tweezing with Super-Gaussian beam profiles. We show that the trapping strength can be tuned continuously by adjusting the order of a Super-Gaussian beam, approaching that of a perfect Gaussian ... Read more
Real and virtual propagation dynamics of angular accelerating white light beams

Author: Vetter, C ; Dudley, Angela L ; Szameit, A ; Forbes, A Date: Aug 2017 Accelerating waves have received significant attention of late, first in the optical domain and later in the form of electron matter waves, and have found numerous applications in non-linear optics, material processing, microscopy, particle ... Read more
Selective excitation of higher-radial-order Laguerre-Gaussian beams using a solid-state digital laser

Author: Bell, Teboho ; Ngcobo, Sandile Date: Jan 2017 In this paper, we use a digital laser to generate high-radial-order Laguerre-Gaussian, LGp,0 modes by loading digital holograms on a phase-only spatial light modulator that act as an end mirror of a diode-end-pumped laser resonator. The digital ... Read more c b d
Simulating spontaneous parametric down-conversion using classical light: Conference paper

Author: Zhang, Y ; McLaren, M ; Roux, FS ; Forbes, A Date: Aug 2014 We present a simple way of simulating Spontaneous parametric down-conversion (SPDC) by modulating a classical laser beam with two spatial light modulators (SLM) through a back projection setup. This system has the advantage of having very ... 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
Stability of a laser cavity with non-parabolic phase transformation elements

Author: Litvin, IA Date: May 2013 In this paper we present a general approach to determine the stability of a laser cavity which can include non-conventional phase transformation elements. We consider two pertinent examples of the detailed investigation of the stability of a ... 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
Tuneable Gaussian to flat-top resonator by amplitude beam shaping

Author: Ngcobo, Sandile ; Ait-Ameur, K ; Litvin, I ; Hasnaoui, A ; Forbes, A Date: Sep 2013 We outline a simple laser cavity comprising an opaque ring and a circular aperture that is capable of producing spatially tuneable laser modes, from a Gaussian beam to a Flat-top beam. The tuneability is achieved by varying the diameter of ... Read more
Tuneable Gaussian to flat-top resonator by amplitude beam shaping using a digital laser

Author: Ngcobo, Sandile ; Ait-Ameur, K ; Litvin, I ; Hasnaoui, A ; Forbes, A Date: Feb 2014 In this paper we experimentally demonstrate a simple laser cavity that produces spatial tuneable laser modes from a Gaussian beam to a Flat-top beam and a Donut-beam. The laser cavity contains an opaque ring and an adjustable circular aperture ... Read more

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Browsing by Subject "Laser beam shaping"

Browsing by Subject "Laser beam shaping"

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