Author:Masina, Bathusile N; Forbes, A; Bodkin, R; Mwakikunga, Bonex WDate:Jul 2012Diamond tools are used in industry for abrasive applications such as grinding, and drilling. One of its important applications is in drill bits used for drilling through rock in search of oil. The early failure of drill bits used in oil ...Read more
Author:Mashaba, Nikiwe P; Griffith, DJDate:Nov 2020Absorption, scattering and refractive index fluctuations are three primary phenomena contributing to optical turbulence. Temperature fluctuations, humidity and air velocity cause variations on both temporal and spatial, in the refractive ...Read more
Author:Schulze, C; Flamm, D; Duparré, M; Forbes, ADate:Nov 2012We present a fast and easy technique for measuring the beam propagation ratio, M2, of laser beams using a spatial light modulator. Our technique is based on digitally simulating the free-space propagation of light, thus eliminating the need ...Read more
Author:Naidoo, Darryl; Forbes, A; Aït-Ameur, K; Brunel, MDate:Jan 2011An 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
Author:Erinosho, MF; Akinlabi, ET; Pityana, Sisa LDate:Apr 2016The laser metal deposition process possesses the combination of metallic powder and laser beam respectively. However, these combinations create an adhesive bonding that permanently solidifies the laser-enhanced-deposited powders. Titanium ...Read more
Author:Mafusire, C; Forbes, ADate:Jul 2011The authors outline a theory for the calculation of the beam quality factor of an aberrated laser beam. They provide closed form equations that show that the beam quality factor of an aberrated Gaussian beam depends on all primary aberrations ...Read more
Author:Hendriks, A; Naidoo, Darryl; Roux, FS; Löpez-Mariscal, C; Forbes, ADate:Aug 2012Phase-only spatial light modulators are now ubiquitous tools in modern optics laboratories, and are often used to generate so-called structured light. In this work we outline the use of a phase-only spatial light modulator to achieve full ...Read more
Author:Goyal, SK; Roux, FS; Forbes, A; Konrad, TDate:Jun 2013We present an implementation scheme for a quantum walk in the orbital angular momentum space of a laser beam. The scheme makes use of a ring interferometer, containing a quarter-wave plate and a q plate. This setup enables one to perform an ...Read more
Author:Naidoo, Darryl; Forbes, A; Aït-Ameur, K; Fromager, MDate:Jan 2011A 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
Author:Pityana, Sisa L; Rossouw, RDate:Oct 2008The aim of this work was to produce crack-free thin surface layers consisting of binary (Al-Ni, Al-Fe) and ternary (Al-Ni-Fe) intermetallic phases by means of a high power laser beam. The laser surface alloying was carried out by melting Fe ...Read more
Author:Forbes, A; Lizotte, TEDate:Sep 2012Full content of the proceedings of the Laser Beam Shaping XIII conference held in San Diego, California, United States.Read more
Author:Kumar, S; Pityana, Sisa LDate:Mar 2010Modification of Aluminium surface by injecting, dispersing and melting TiB2 powder with the help of a laser beam promises to enhance tribological properties of Aluminium. The present work consists of making single lines and various overlapping ...Read more
Author:Ismail, Y; Barnes, G; Mhlanga, T; Belyi, V; Forbes, ADate:Mar 2010In this paper the authors outline an optical design for producing high-order Bessel-like beams with a z-dependent cone angle through the use of conventional optical elements, without the need for deliberate aberrations to be included.Read more
Author:Dudley, Angela LDate:Jul 2016This presentation focuses on the manipulation of structured light. Structured light manipulation allows people to dynamical change the spatial profile of an optical field.Read more
Author:Long, Craig S; Loveday, Philip W; Forbes, A; Land, KDate:Jan 2010For intra-cavity laser beam control, a small, low-cost deformable mirror is required. This mirror can be used to correct for time- dependent phase aberrations to the laser beam, such as those caused by thermal expansion of materials. A ...Read more
Author:Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen CDate:Aug 2010Gas lenses work on the basis that aerodynamic media can be used to generate a graded refractive index distribution which can be used to focus a laser beam. Examples of these are the spinning pipe gas lens (SPGL) and the flame lens (FL). The ...Read more
Author:West, NJ; Jandrell, IR; Forbes, ADate:Aug 2007In this research, an orthogonally laser-triggered spark gap is investigated. The laser beam is directed in the region of a 30mm spark gap at 90 degrees to the gap and focused on the axis. The influence of plasma position within the spark gap ...Read more
Author:Burger, L; Litvin, IA; Forbes, ADate:Apr 2008Demonstration 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
Author:Schulze, C; Dudley, Angela L; Flamm, D; Duparr, M; Forbes, ADate:Oct 2013We present a novel tool for sorting the orbital angular momentum and to determine the orbital angular momentum density of laser beams, which is based on the use of correlation filters.Read more
Author:McLaren, M; Romero, J; Padgett, MJ; Roux, FS; Forbes, ADate:Sep 2013In this paper we consider geometrical two-photon optics of Bessel-Gaussian modes generated in spontaneous parametric down-conversion of a Gaussian pump beam. We provide a general theoretical expression for the orbital angular momentum (OAM) ...Read more