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Browsing Conference Publications by Subject "Laser"

Now showing items 1-18 of 18

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
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 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
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
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
Mechatronic sensor system for robots and automated machines

Author: Shaik, AA ; Bright, G ; Xu, WL Date: Jan 2007 Flex-Picker robots, as well as many automated multi-axis machines, operate under overall "open loop" control. The exact position in space of the end effecter or tool head is not sensed directly. The software controlling the robot or automated ... Read more
The microstructural and in vitro characteristics of hydroxyapatite coating fabricated using Nd-YAG laser

Author: Tlotleng, Monnamme ; Akinlabi, E ; Shukla, M ; Pityana, Sisa L Date: Mar 2015 Hydroxyapatite (HAP) is the most researched calcium phosphate material in the field of biomaterials to be used for bone re-engineering applications; given its attractive properties. Plasma spraying is the best available industrial method that ... Read more
Microstructure and wear behaviour of Al/TiB2 metal matrix composite

Author: Popoola, AP ; Pityana, Sisa L ; Ogunmuyiwa, E Date: Oct 2010 Al/TiB2 metal matrix composite (MMCs) was fabricated on aluminium AA1200 with the aim of improving the wear resistance property of the substrate. The characterization of the MMCs was carried out by Optical Microscopy (OM), Scanning Electron ... Read more
Optical trapping and tweezing using a spatial light modulator

Author: Ismail, Y ; Mclaren, MG ; Forbes, A Date: Jul 2009 This presentation provides information on optical trapping and tweezing using a spatial light modulator. Read more
Q-switched Ho:YLF laser pumped by a Tm:GdVO4 laser.

Author: Esser, MJD ; Strauss, Hencharl J ; Koen, WS ; Preussler, D ; Nyangaza, K ; Bollig, C Date: Jun 2009 The authors have, through careful analysis of spectroscopic data, designed and demonstrated a diode-end-pumped, quasicontinuous wave Tm:GdVO4 laser operating at 1892 nm in order to pump a Q-switched Ho:YLF laser. The Ho:YLF maximum output ... Read more
Superpositions of higher-order bessel beams and nondiffracting speckle fields - (SAIP 2009)

Author: Dudley, Angela L ; Vasilyeu, R ; Forbes, A ; Khilo, N ; Ropot, P Date: Jul 2009 This poster presents a mechanism for the generation of the superposition of higher-order Bessel beams, which implements a ring slit aperture and spatial light modulator (SLM). The experimental technique is also adapted to generate nondiffracting ... Read more
Ultrafast pump-probe spectroscopy of Zinc Phthalocynine (ZnPc) and light harvesting complex II (LHC II)

Author: Ombinda-Lemboumba, Saturnin ; Du Plessis, A ; Botha, L ; Roberts, DE ; Molukanele, P ; Sparrow, RW ; Rohwer, EG ; Steenkamp, CM Date: Jul 2009 The presentation discusses basic principles of pump-probe technique, possible transient absorption signals, LHC II and ZnPc, experimental setup, chirp measurement and correction methods. The results of the study, conclusion and future work ... Read more

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