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Browsing by Author "Botha, L"

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  • Du Plessis, A; Strydom, C; Botha, L (MDPI, 2010-03)
    Changes in the laser induced molecular dissociation of 1,1,1-trichloroethane (TCE) were studied using a range of intensities and standard laser wavelengths with nanosecond and femtosecond pulse durations. TCE contains C-H, ...
  • Uys, H; Akhalwaya, I; Botha, N; Burd, S; Hendriks, A; Madigoe, R; Ombinda, S; Smit, A; Kloppers, H; Steyn, J; Botha, L (2012-10)
    In this presentation the authors discuss the technological relevance of quantum mechanics, and describe how researchers use light to control the atomic and molecular world at its most fundamental level.
  • Botha, L (IEEE Xplore, 2012-09)
    The cost of antennas for instrumentation radars are determined by the development cost. By re-use of the reflector system cost effective antennas can be designed. The factors governing the design of such antennas are ...
  • Neethling, PH; Rohwer, EG; Schwoerer, H; Botha, L (2010-10)
    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 ...
  • Krug, T; Botha, L; Shamba, P; Baisitse, TR; Venter, A; Engelbrecht, JAA; Botha, JR (Elsevier Science BV, 2006)
    Strong surface inversion usually leads to deceptive Hall measurements by reflecting typical n-type behaviour for p-type samples, especially at very low doping concentrations. A two-layer model is presented which can ...
  • Du Plessis, A; Strydom, CA; Uys, H; Botha, L; Roberts, T; Dlamini, TH (CSIR, 2010-09)
    Femtosecond laser control of chemical reactions is made possible through the use of pulse-shaping techniques coupled to a learning algorithm feedback loop – teaching the laser pulse to control the chemical reaction. This ...
  • Du Plessis, A; Strydom, CA; Uys, H; Botha, L; Roberts, T; Dlamini, TH (CSIR, 2010-08-31)
    Femtosecond laser control of chemical reactions is made possible through the use of pulse-shaping techniques coupled to a learning algorithm feedback loop – teaching the laser pulse to control the chemical reaction. This ...
  • Botha, N; Botha, L; Du Plessis, A; Schwoerer, H (CSIR, 2010-08-31)
    Femtosecond pulse shaping can be done by different kinds of pulse shapers, such as liquid crystal spatial light modulators (LC SLM), acousto optic modulators (AOM) and deformable and movable mirrors. A few applications ...
  • Von Bergmann, H; Forbes, A; Roberts, T; Botha, L (The International Society for Optical Engineering, 2007)
    In this paper the author’s present results on the influence of acoustic waves on the output laser beam from high repetition rate TEA CO2 lasers. The authors show that acoustic waves generated inside the cavity lead to ...
  • Forbes, A; Botha, L; Du Preez, N; Drake, T (The International Society for Optical Engineering, 2007)
    Laser ultrasonics is currently the optimal method for non-destructive testing of composite materials in the aerospace industry. The process is based on a laser-generated ultrasound wave which propagates inside the composite. ...
  • Botha, L; Du Plessis, A; Uys, H; de Clercq, L (CSIR, 2010-09-01)
    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 ...
  • Mcnamara, DA; Botha, L (IEEE-INST Electrical Electronics Engineers INC, 1993-11)
    The radiation properties of individual folded dipole antennas mounted at various radial distances from the centre of conducting masts of different diameters are described in compact fashion.
  • Forbes, A; Botha, L (International Society for Optical Engineering, 2005-03)
    A model is developed for the breakdown and regeneration of component gases in an industrialised TEA CO2 laser, both with and without internal catalysts, and is found to be in excellent agreement with experimental data. The ...
  • Botha, L; Gaffar, YA (2006-02)
    The study, by CSIR Defence, Peace, Safety and Security is using propagation prediction software to predict the propagation effects of both communication and radar systems. These are the models used in the study: Free Space ...
  • Botha, N; Botha, L; Du Plessis, A; Uys, H; Schoewer, H (2010-10)
    The design of the pulse shaping setup as well as factors taken into account in choosing a specific setup will be discussed. We investigate the generation of simple shaped pulses to test our pulse shaper setup. Difference ...
  • Botha, N; Botha, L; Du Plessis, A (South African Institute of Physics (SAIP), 2009-07)
    Femtosecond pulse shaping can be done by different kinds of pulse shapers, such as liquid crystal spatial light modulators (LC SLM), acousto optic modulators (AOM) and deformable and movable mirrors. A few applications ...
  • Molukanele, P; Du Plessis, A; Roberts, T; Botha, L; Khati, M; Campos, W (2011-09)
    Potential for the selective deactivation of viruses while leaving the sensitive material such as the host cell unharmed was studied using a femtosecond laser system, and preliminary results are reported.
  • Molukanele, P; Du Plessis, A; Roberts, T; Botha, L; Khati, M; Campos, W (SAIP 2010, 2010-09)
    Potential for the selective deactivation of viruses while leaving the sensitive material such as the host cell unharmed was studied using a femtosecond laser system, and preliminary results are reported.
  • Molukanele, P; Du Plessis, A; Roberts, T; Botha, L; Khati, M; Campos, W; Rotherham, L (CSIR, 2010-09-01)
    Viruses can be described as acellular organisms whose genome consists of nucleic acid that replicate inside living cells (host cells) using their cellular synthetic machinery, and cause the synthesis of specialised elements ...
  • de Clercq, L; Botha, L; Uys, H; Du Plessis, A; Rohwer, E (2010-09)
    Coherent control of the upper vibrational level populations in the electronic ground state of a polyatomic molecule was simulated. Results indicate that selective excitation of a specific upper state level is possible