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Amplitude damping of vortex modes

Author: Dudley, Angela L ; Nock, M ; Konrad, T ; Roux, F ; Forbes, A Date: Sep 2010 An interferometer, mimicking an amplitude damping channel for vortex modes, is presented. Experimentally the action of the channel is in good agreement with that predicted theoretically. Since we can characterize the action of the channel on ... Read more
Bioceramic hydroxyapatite coating fabricated on TI-6Al-4V using Nd:YAG Laser

Author: Tlotleng, Monnamme ; Akinlabi, E ; Shukla, M ; Pityana, Sisa L ; Mathebula, T ; Chauke, Levy Date: Nov 2014 A method of synthesising a biocompatible HAP coating is presented. In the current study, Nd:YAG laser was used to directly melt pre-place HAP powder beds on Ti-6Al-4V. The processing parameters used were 750 W laser power, 5 mm/s scanning ... Read more
Compact fibre-laser-pumped Ho:YLF oscillator–amplifier system

Author: Koen, W ; Bollig, C ; Strauss, Hencharl J ; Schellhorn, M ; Jacobs, Cobus ; Esser, MJD Date: Apr 2010 The authors developed a compact Ho:YLF oscillator–amplifier system in a novel setup to utilise the unpolarised pump power from a fibre laser efficiently, and produced 21.3 mJ at 1 kHz, with an M 2 better than 1.1. The amplified energies agreed ... Read more
Composites by rapid prototyping technology

Author: Kumar, S ; Kruth, J-P Date: Feb 2010 The use of rapid prototyping (RP) technology for rapid tooling and rapid manufacturing has given rise to the development of application-oriented composites. The present paper furnishes succinct notes of the composites formed using main rapid ... Read more
Demonstrating optical aberrations in the laboratory

Author: Naidoo, Darryl ; Mafusire, C ; Forbes, A Date: Jul 2009 An optical aberration is a distortion of an image as compared to the object due to defects in an optical system Read more
Development of a high power femtosecond laser

Author: Neethling, PH ; Rohwer, EG ; Schwoerer, H ; Botha, L Date: Oct 2010 The Laser Research Institute and the CSIR National Laser Centre are developing a high power femtosecond laser system in a joint project with a phased approach. The laser system consists of an fs oscillator and a regenerative amplifier. An ... Read more
Effects of A1 and heat treatment on the microstructure and hardness of Ti-A1 synthesized via in situ melting using LENS

Author: Tlotleng, Monnamme Date: May 2019 Producing alloys via in-situ laser alloying approach is becoming very easy and a topical issue in the field of laser additive manufacturing. Several studies have emerged, accompanied by a statement by Gasper et al. (2017), who reported the ... Read more
Effects of heat-treatment on the microstructure of TiAl-Nb produced with laser metal deposition technique

Author: Tlotleng, Monnamme ; Lengopeng, Thabo ; Seerane, Mandy N ; Pityana, Sisa L Date: Oct 2017 Ti and its intermetallic alloys are light-weight and have good creep properties. Materials of this nature are desired for the manufacturing of parts for the aerospace, automotive and power plants. Titanium aluminides, in particular, are ... Read more
Experimental generation and application of the superposition of higher-order Bessel beams

Author: Dudley, Angela L ; Vasilyeu, R ; Forbes, A ; Khilo, N ; Ropot, P Date: Jul 2009 This presentation provides information on experimental generation and application of the superposition of higher-order Bessel beams. The superposition of zero order Bessel beams can be used to measure the radius of curvature of a reflecting ... Read more
Experimental verification and validation of a computer model for light–tissue interaction

Author: Karsten, AE ; Singh, A ; Braun, MW Date: Apr 2011 Laser light is frequently used in both diagnostics and treatment of patients. For any laser treatment to be effective it is important to deliver the correct dose at the treatment site. Human skin scatters and absorbs laser light in the visible ... Read more
Fabrication of selective solar absorbers using pulsed laser deposition

Author: Yalisi, B ; Katumba, G ; Forbes, A ; Pillay, SR Date: Jun 2009 Selective solar absorbers are devices that have been designed to absorb as much as possible of the solar radiation which is in the wavelength range of 0.3 to 2.5 µm and to minimise thermal emittance in the wavelength range from 2.5µm to the ... Read more
Fibre optic-VLC versus laser-VLC: A review study

Author: Fon, RC ; Ndjiongue, AR ; Ouahada, K ; Abu Mahfouz, Adnan MI Date: Jun 2023 The exponential increase in the demand for a fast and reliable wireless mobile network motivates the need for researchers to engage more actively in visible light communication (VLC) technology. This increase happens in parallel with the ... 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
Hardfacing of aluminium alloys by means of metal matrix composites produced by laser surface alloying

Author: Pityana, Sisa L Date: Jun 2009 Metal matrix composite layers were formed on an aluminium substrate by means of laser surface alloying method. Aluminium 1200 was used as a host material and TiC particles were used as the reinforcement. The microstructure of the modified ... Read more
Laser alloying of Al with mixed Ti and Ni powders to improve surface properties

Author: Mabhali, Luyolo AB ; Pityana, Sisa L ; Rampedi, DL Date: Jul 2008 Aluminium is used in industry for various applications due to its low cost, light weight and excellent workability, but lacks wear resistance and hardness. Laser alloying is used to improve surface properties such as hardness and wear resistance ... Read more
Laser cladding of aluminium using TiB2

Author: Kumar, S ; Pityana, Sisa L Date: Mar 2010 Modification 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
Laser coherent control of quantum dynamics at the CSIR: NLC

Author: Botha, L ; Du Plessis, A ; Uys, H ; de Clercq, L Date: 01 Sep 2010 Coherent control of quantum dynamics in optical, molecular and biological systems is a rapidly advancing field with many possible applications. This field of study was originally motivated by the goal of steering photoreactions into specific ... Read more
Lidar research in South Africa

Author: Venkataraman, S Date: 2008 Two laser-radar systems in South Africa offer great potential to characterize the region's atmospheric particulate matter and pollutants. Lasers offer great advantages over conventional light sources in terms of peak power and narrow spectral ... Read more
Liposomes as a drug delivery system in photodynamic therapy for colon cancer treatment

Author: Maduray, K ; Karsten, AE Date: Jan 2010 Photodynamic therapy (PDT) uses a drug termed a photosensitizer (PS), light (laser) of an appropriate wavelength and molecular oxygen (tissue) to elicit cell death of cancer cells. The objective of this study was to evaluate the enhancement ... Read more
Local heat treatment of a laser build-up

Author: Theron, Maritha ; Van Rooyen, Corney ; Malabi, Khorommbi P ; Hoosain, Shaik E Date: 2019 Laser cladding or laser metal deposition involves the deposition of any weldable material onto the surface of a metal substrate by means of a laser beam. Although clad deposits are fully fusion-joined to the substrate material, the very low ... Read more

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Browsing by Subject "Laser"

Browsing by Subject "Laser"

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