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Browsing Conference Publications by Subject "Lasers"

Now showing items 1-15 of 15

Atmospheric aerosol load morphological classification and retrieved visibility based on lidar backscatter measurements

Author: Tesfaye, M ; Sivakumar, V ; Mengistu, G ; Botai, J ; Sharma, Ameeth ; Bollig, C ; Rautenbach, CJdWH Date: 2010 In this paper, the tropospheric aerosol load morphological classification and its impact on temporal variation of visibility are investigated using a continuous 23-hour single channel CSIR-NLC mobile LIDAR backscatter measurement. The trajectory ... Read more
Azimuthal decomposition of optical modes

Author: Dudley, Angela L ; Litvin, I ; Roux, FS ; Forbes, A Date: Jul 2012 This presentation analyses the azimuthal decomposition of optical modes. Decomposition of azimuthal modes need two steps, namely generation and decomposition. An azimuthally-varying phase (bounded by a ring-slit) placed in the spatial frequency ... Read more
Biology at a single cell level

Author: Mthunzi-Kufa, Patience Date: Oct 2012 In this presentation the author highlights the use of lasers in micro-manipulating single cells and molecules. Read more
Demonstration of a hybrid Ho:YLF Ho:LuLF slab laser

Author: Esser, MJD ; Collett, O ; Bollig, C Date: Oct 2010 The authors present a continuous-wave slab laser utilising both Ho:YLF and Ho:LuLF as laser gain media. 30 W of output power at 2 µm was demonstrated in a stable concave-plane resonator while 13 W was achieved in a hybrid stable-unstable ... Read more
Efficient fiber-laser-pumped Ho:YLF oscillator and amplifier utilizing the transmitted pump power of the oscillator

Author: Strauss, Hencharl J ; Koen, W ; Bollig, C ; Esser, MJD ; Preussler, D ; Nyangaza, K ; Jacobs, Cobus Date: Jun 2009 In this paper, researchers have demonstrated that a Ho:YLF oscillator and amplifier system can be designed in a compact setup where the pump power from an unpolarized fibre laser utilized efficiently. The system produced more than 20 mJ energy ... Read more
High-power diode-end-pumped Tm:YLF slab laser delivering 189 W at 1890 nm

Author: Koen, W ; Strauss, Hencharl J ; Bollig, C ; Esser, MJD Date: Sep 2010 The authors present a high-power Tm:YLF slab laser double-end-pumped by two 300 W laser diode stacks. The resonator was designed such that the laser emitted at 1890 nm instead of the conventional operating wavelength of 1912 nm. At full ... Read more
High-power diode-pumped Tm:YLF slab laser

Author: Schellhorn, M ; Ngcobo, S ; Bollig, C ; Esser, MD ; Preussler, DR ; Nyangaza, K Date: Jun 2009 The aim is to develop a high-power Tm:YLF slab laser which can be utilized to pump a Ho slab laser. A 68 W Tm:YLF slab laser was recently presented in [1] pumped from one end by a single 6-bar stack delivering ~300 W of pump power. In this ... Read more
Laser surface alloying (LSA) of aluminium (AA 1200) with TiB2 for hardness improvement

Author: Popoola, AP ; Pityana, Sisa L Date: Oct 2010 The present work deals with the development of Aluminium metal matrix composite (MMC) using TiB2 reinforcement. The aim is to improve the microhardness property of the substrate. The surface of the aluminium was sand blasted to improve its ... Read more
Measuring the orbital angular momentum density for a superposition of Bessel beams

Author: Dudley, Angela L ; Litvin, I ; Forbes, A Date: Jan 2012 To measure the Orbital Angular Momentum (OAM) density of superposition fields two steps are needed: generation and measurement. An azimuthally-varying phase (bounded by a ring-slit) placed in the spatial frequency domain produces a higher-order ... Read more
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
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
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
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

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