Dr. Lourens Rasmus Botha Profile

Dr. Lourens Rasmus Botha

Senior Scientist at Council for Scientific and Industrial Research

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 8 November 2012 Paper

Demonstration of a wavelength selected optically pumped HBr laser

Wayne Koen, Cobus Jacobs, Christoph Bollig, Hencharl Strauss, Lourens Botha, M. Esser

Proceedings Volume 8543, 85430E (2012) https://doi.org/10.1117/12.974710

KEYWORDS: Oscillators, Mirrors, Optical pumping, Laser optics, Absorption, Diffraction gratings, Molecular lasers, Pulsed laser operation, Optical amplifiers, Polarizers

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Proceedings Article | 11 February 2011 Paper

Optimal control of the population dynamics of the ground vibrational state of a polyatomic molecule

Ludwig de Clercq, Lourens Botha, Erich Rohwer, Hermann Uys, Anton Du Plessis

Proceedings Volume 7925, 79250V (2011) https://doi.org/10.1117/12.874562

KEYWORDS: Molecules, Spatial light modulators, Femtosecond phenomena, Molecular interactions, Molecular lasers, Pulse shaping, Genetic algorithms, Chemical reactions, Laser development, Optimization (mathematics)

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Proceedings Article | 22 August 2009 Paper

Paint stripping with high power flattened Gaussian beams

Andrew Forbes, Neil du Preez, Vladimir Belyi, Lourens Botha

Proceedings Volume 7430, 74300O (2009) https://doi.org/10.1117/12.829173

KEYWORDS: Diffractive optical elements, Mirrors, Gaussian beams, Resonators, Carbon dioxide lasers, Laser beam propagation, Output couplers, Signal attenuation, Pulsed laser operation, Optical design

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Proceedings Article | 18 April 2009 Paper

High power infrared super-Gaussian beams: generation, propagation, and application

Neil du Preez, Andrew Forbes, Lourens Botha

Proceedings Volume 7131, 71311E (2009) https://doi.org/10.1117/12.820058

KEYWORDS: Diffractive optical elements, Mirrors, Resonators, Output couplers, Laser beam propagation, Carbon dioxide lasers, Gaussian beams, Laser resonators, Wavefronts, Beam propagation method

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SPIE Journal Paper | 1 August 2008

Acoustic waves in transversely excited atmospheric CO₂ laser discharges: effect on performance and reduction techniques

Hubertus von Bergmann, Andrew Forbes, Ted Roberts, Lourens Botha

OE, Vol. 47, Issue 08, 084202, (August 2008) https://doi.org/10.1117/12.10.1117/1.2968227

KEYWORDS: Acoustics, Gas lasers, Electrodes, Carbon monoxide, Pulsed laser operation, Laser resonators, Optical engineering, Atmospheric optics, Laser systems engineering, Laser development

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Proceedings Article | 30 April 2007 Paper

Picosecond mid-infrared amplifier for high average power

L. Botha, S. P. van Heerden, F. Prinsloo

Proceedings Volume 6346, 63463B (2007) https://doi.org/10.1117/12.739382

KEYWORDS: Gas lasers, Carbon monoxide, Amplifiers, Electrodes, Pulsed laser operation, Optical amplifiers, Picosecond phenomena, Mid-IR, Laser development, Semiconductors

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Proceedings Article | 27 April 2007 Paper

Efficient TEA CO2-laser-based coating removal system

F. Prinsloo, S. P. van Heerden, E. Ronander, L. Botha

Proceedings Volume 6346, 63462Q (2007) https://doi.org/10.1117/12.739109

KEYWORDS: Gas lasers, Pulsed laser operation, Carbon monoxide, Coating, Composites, Carbon dioxide lasers, Aluminum, Atmospheric particles, High power lasers, Plasma

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Proceedings Article | 26 April 2007 Paper

Influence of laser parameters on laser ultrasonic efficiency

Andrew Forbes, Lourens Botha, Neil du Preez, Tommy Drake

Proceedings Volume 6346, 63462X (2007) https://doi.org/10.1117/12.739125

KEYWORDS: Carbon monoxide, Gas lasers, Pulsed laser operation, Oxygen, Ultrasonics, Reflectivity, Laser systems engineering, Output couplers, Ultrasonography, Composites

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Proceedings Article | 26 April 2007 Paper

Influence of acoustic waves on TEA CO2 laser performance

Hubertus von Bergmann, Andrew Forbes, Ted Roberts, Lourens Botha

Proceedings Volume 6346, 634606 (2007) https://doi.org/10.1117/12.737142

KEYWORDS: Acoustics, Electrodes, Gas lasers, Carbon monoxide, Wind energy, Pulsed laser operation, Solids, Nondestructive evaluation, Laser systems engineering, Laser development

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Proceedings Article | 23 March 2005 Paper

Predicting gas decomposition in an industrialized pulsed CO2 laser

Andrew Forbes, Lourens Botha

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611067

KEYWORDS: Oxygen, Carbon dioxide lasers, Carbon dioxide, Carbon monoxide, Data modeling, Gas lasers, Platinum, Pulsed laser operation, Gases, Laser development

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Proceedings Article | 24 October 2002 Paper

Beam delivery for stable isotope separation

Andrew Forbes, Hendrick Strydom, Lourens Botha, Einar Ronander

Proceedings Volume 4770, (2002) https://doi.org/10.1117/12.451640

KEYWORDS: Amplifiers, Lithium, Isotope separation, Wave propagation, Beam delivery, Absorption, Continuous wave operation, Copper, Multiphoton processes

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Proceedings Article | 4 September 2002 Paper

Physical optics modeling of intracavity thermal distortions in solid state laser resonators

Andrew Forbes, Lourens Botha

Proceedings Volume 4768, (2002) https://doi.org/10.1117/12.482189

KEYWORDS: Telescopes, Resonators, Absorption, Diffraction, Optical damage, Thermal modeling, Wavefronts, Nd:YAG lasers, Solid state lasers, Spherical lenses

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Proceedings Article | 25 January 2001 Paper

Beam perturbations through a MOPA chain

Andrew Forbes, Lourens Botha, Hendrick Strydom, Francois Prinsloo, Einar Ronander

Proceedings Volume 4184, (2001) https://doi.org/10.1117/12.413983

KEYWORDS: Beam propagation method, Optical amplifiers, Oscillators, Laser beam propagation, Wave propagation, Absorption, Wavefronts, Diffusion, Monochromatic aberrations, Beam shaping

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Proceedings Article | 25 January 2001 Paper

Modeling of injection seeding of a pulsed high-pressure CO2 laser

Lourens Botha, Erich Rohwer

Proceedings Volume 4184, (2001) https://doi.org/10.1117/12.414078

KEYWORDS: Spatial light modulators, Carbon dioxide lasers, Resonators, Output couplers, Mathematical modeling, Differential equations, Reflectivity, Physics, Pulsed laser operation

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Proceedings Article | 4 April 1997 Paper

Generation of continuously tunable 16 micron radiation by four-wave mixing in a parahydrogen Raman cell

Lourens Botha, Christo Liebenberg

Proceedings Volume 3092, (1997) https://doi.org/10.1117/12.270202

KEYWORDS: Four wave mixing, Raman spectroscopy, Carbon dioxide lasers, Mid-IR, Tunable lasers, Oscillators, Carbon dioxide, Raman scattering, Sensors, Photodetectors

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Proceedings Article | 14 July 1995 Paper

Limiting laser-induced damage in a high-repetition rate CO2 laser chain

Francois Prinsloo, Stephanus van Heerden, Lourens Botha, Einar Ronander, Chris Herselman, R. Wellman

Proceedings Volume 2428, (1995) https://doi.org/10.1117/12.213729

KEYWORDS: Optical components, Laser induced damage, Carbon dioxide lasers, Acoustics, Laser systems engineering, Sensors, Optical amplifiers, Photoacoustic spectroscopy, Pulsed laser operation, Raman spectroscopy

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SPIE Journal Paper | 1 September 1994

Limitation of CO₂ laser-induced gas breakdown

Francois Prinsloo, Stephanus van Heerden, Lourens Botha

OE, Vol. 33, Issue 09, (September 1994) https://doi.org/10.1117/12.10.1117/12.175675

KEYWORDS: Particles, Raman spectroscopy, Hydrogen, Carbon dioxide lasers, Gas lasers, Ionization, Laser damage threshold, Atmospheric particles, Solids, Carbon dioxide

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SPIE Journal Paper | 1 September 1994

Continuously tunable CO₂ MOPA chain for a molecular laser isotope separation pilot plant

Lourens Botha, Christo Liebenberg, Hubertus von Bergmann, Francois Prinsloo, Einar Ronander, Hendrick Strydom

OE, Vol. 33, Issue 09, (September 1994) https://doi.org/10.1117/12.10.1117/12.175677

KEYWORDS: Carbon dioxide lasers, Carbon dioxide, Oscillators, Pulsed laser operation, Isotope separation, Molecular lasers, Laser development, Resonators, Optical amplifiers, Reflectivity

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Showing 5 of 18 publications

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