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Now showing items 21-33 of 33

Microstructures of alloyed and dispersed hard particles in the aluminium surface

Author: Pityana, Sisa L Date: Mar 2010 Laser surface alloying of A1200 aluminium alloy was carried out using a 4.4 kW Nd:YAG laser. Powder mixtures of SiC and TiC hard particles were injected into the laser generated melt pool on the aluminium substrate using a commercial powder ... 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
Optically pumped tunable HBr laser in the mid-infrared region

Author: Koen, W ; Jacobs, Cobus ; Bollig, C ; Strauss, Hencharl J ; Esser, MJD ; Botha, LR Date: Jun 2014 An optically pumped tunable HBr laser has been demonstrated for the first time. The pump source was a single-frequency Ho:YLF laser and amplifier system, which was locked to the 2064 nm absorption line of HBr. Laser oscillation was demonstrated ... Read more
Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam

Author: Romero, J ; Giovannini, D ; McLaren, MG ; Galvez, EJ ; Forbes, A ; Padgett, MJ Date: Aug 2012 We report orbital angular momentum (OAM) and angle correlations between signal and idler photons observed when the nonlinear crystal used in spontaneous parametric down-conversion is illuminated by a non-fundamental Gaussian pump beam. We ... Read more
Photo-transfection of mammalian cells via femtosecond laser pulses

Author: Mthunzi-Kufa, Patience ; Gunn-Moore, FJ ; Dholakia, K Date: Jun 2009 Various methods including chemical, viral or physical approaches have been developed to trigger transient membrane permeabilisation with limited cytotocixity in cells. Such developments permit efficient cytoplasmic delivery of genes, ... Read more
Physics and astronomy

Author: Moraal, H ; Britton, D ; Derry, T ; Forbes, A ; Grayson, D ; Mullins, S ; Scholtz, F ; Sefako, R Date: 2009 The chapter is about physics and astronomy. The chapter gives a background about the origins of physics in South Africa. After the CSIR was founded in 1945, physics emerged as a nationwide and unified discipline. The authors show how physics ... Read more
Power and energy scaling of a diode-end-pumped Nd:YLF laser through gain optimization

Author: Bollig, C ; Jacobs, Cobus ; Esser, MJD ; Bernhard, EH ; Von Bergmann, HM Date: Jun 2010 An end-pumped Nd:YLF laser was demonstrated, which delivered 60.3 W continuous-wave and more than 52 W Q-switched average power for all repetition rates from 5 to 30 kHz. To achieve this, an analytical solution to estimate and optimize the ... Read more
Preliminary investigation into laser high voltage interaction in the case of streamer-to-leader process using a high power CO2 laser

Author: West, NJ ; Jandrell, IR ; Forbes, A Date: 2006 This paper describes the preliminary small-scale experiments conducted in order to investigate the influence of intensely focused laser light produced by a CO2 laser on high voltage fields. The laser used operated at a maximum energy of 430 ... Read more
Prolonging coherence in trapped ions

Author: Uys, H ; Biercuk, M ; Van Devender, AP ; Bollinger, JJ Date: Sep 2010 The authors study pulse sequences that dynamically decouple 9Be+ ions from their decohering environment. The noise environment the ions see is artificially synthesized to emulate a variety of physical systems. By incorporating measurement ... 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
Shaping light

Author: Forbes, A ; Long, Craig S ; Loveday, Philip W ; Litvin, I Date: 2010 Modern micro-optical elements and adaptive mirrors exploit diffraction to shape light inside a laser. Read more
Short-pulse generation in a diode-end-pumped solid-state laser

Author: Ngcobo, Sandile ; Bollig, C ; Von Bergmann, H Date: Sep 2010 A Nd: YVO4 modelocked laser has been constructed using a resonator designed according to the theoretical parameters. The laser produced pulses in the picosecond region with a maximum average output power of 2.8W. Passive modelocking of the ... Read more
Tangling with telecomes

Author: Roux, S Date: Jul 2011 At the CSIR’s National Laser Centre, a team of researchers is pursuing Free Space Quantum Communication: transmitting optical signals by using the quantum properties of laser light. The aim is to provide secure and safe ways of communication ... Read more

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Browsing by Subject "Lasers"

Browsing by Subject "Lasers"

Browse

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