Dr. Sandile Ngcobo Profile

Dr. Sandile Ngcobo

Researcher at CSIR National Laser Ctr

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Author

Publications (19)

Proceedings Article | 4 March 2022 Poster + Presentation + Paper

Intracavity beam shaping using digital holograms in continuous-wave-diode-pumped Nd: YAG laser module

Teboho Bell, Chemist Mabena, Sandile Ngcobo

Proceedings Volume 11980, 1198009 (2022) https://doi.org/10.1117/12.2609630

KEYWORDS: Digital holography, Holograms, Beam shaping, YAG lasers, Spatial light modulators, Laser applications, Solid state lasers, Resonators

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Proceedings Article | 4 March 2019 Presentation + Paper

Intracavity second harmonic generation for higher-order laser modes

Teboho Bell, Sandile Ngcobo

Proceedings Volume 10904, 109041P (2019) https://doi.org/10.1117/12.2507884

KEYWORDS: Ferroelectric materials, Crystals, Nonlinear crystals, Modes of laser operation, Laser crystals, Second-harmonic generation, Harmonic generation, Laser resonators, Digital holography, Neodymium

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Proceedings Article | 22 April 2016 Paper

Discrete excitation of mode pulses using a diode-pumped solid-state digital laser

Sandile Ngcobo, Teboho Bell

Proceedings Volume 9727, 97271J (2016) https://doi.org/10.1117/12.2214567

KEYWORDS: Solid state lasers, Solid state physics, Semiconductor lasers, Diode pumped solid state lasers, Q switches, Modes of laser operation, Digital holography, Laser resonators, Resonators, Holograms, Spatial light modulators, Pulsed laser operation, Mode locking

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Proceedings Article | 22 April 2016 Paper

Thermal lensing measurement from the coefficient of defocus aberration using Shack-Hartmann wavefront sensor

Teboho Bell, Darryl Naidoo, Sandile Ngcobo, Andrew Forbes

Proceedings Volume 9727, 97271L (2016) https://doi.org/10.1117/12.2205141

KEYWORDS: Wavefront sensors, Solid state lasers, Nd:YAG lasers, Laser resonators, Resonators, Collimation, Gaussian beams, Laser beam diagnostics, Mirrors, Crystals, Calibration, Laser crystals, Wavefronts

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Proceedings Article | 22 April 2016 Paper

Intracavity generation of low-loss radial-order Laguerre-Gaussian modes using digital holograms

Teboho Bell, Kamel Äit-Ameur, Andrew Forbes, Sandile Ngcobo

Proceedings Volume 9727, 97271K (2016) https://doi.org/10.1117/12.2199421

KEYWORDS: Digital holography, Holograms, Resonators, Laser resonators, Spatial light modulators, Solid state lasers, Semiconductor lasers, Nd:YAG lasers, Gaussian beams

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Proceedings Article | 25 September 2015 Paper

Intracavity beam shaping using an SLM

L. Burger, I. Litvin, S. Ngcobo, A. Forbes

Proceedings Volume 9581, 95810A (2015) https://doi.org/10.1117/12.2188593

KEYWORDS: Spatial light modulators, Resonators, Mirrors, Reflectivity, Beam shaping, Polarization, Phase shift keying, Amplitude modulation, Liquid crystals, Beam splitters

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Proceedings Article | 25 August 2015 Paper

Selective excitation and detection of higher-order doughnut laser modes as an incoherent superposition of two petals modes in a digital laser resonator

Sandile Ngcobo, Teboho Bell, Igor Litvin, Darryl Naidoo, Kamel Ait-Ameur, Andrew Forbes

Proceedings Volume 9581, 95810B (2015) https://doi.org/10.1117/12.2187892

KEYWORDS: Superposition, Laser resonators, Digital holography, Mirrors, Modes of laser operation, Spatial light modulators, Resonators, Holograms, Beam propagation method, Opacity

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Proceedings Article | 25 August 2015 Paper

Low-loss selective excitation of higher-order modes in a diode-pumped solid-state digital laser

Sandile Ngcobo, Teboho Bell, Kamel Ait-Ameur, Andrew Forbes

Proceedings Volume 9581, 95810S (2015) https://doi.org/10.1117/12.2195751

KEYWORDS: Digital holography, Laser resonators, Holograms, Spatial light modulators, Solid state lasers, Solid state physics, Semiconductor lasers, Laser damage threshold, Resonators, Holography

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Proceedings Article | 3 March 2015 Paper

Generation of shape-invariant flat-top laser beams

Kamel Ait-Ameur, Darryl Naidoo, Sandile Ngcobo, Michael Fromager, Igor Litvin, Abdelkrim Hasnaoui, Ali Harfouche, Andrew Forbes

Proceedings Volume 9343, 93430P (2015) https://doi.org/10.1117/12.2075576

KEYWORDS: Mirrors, Gaussian beams, Near field optics, Laser resonators, Beam shaping, Interferometry, Near field, Spatial light modulators, Reflectivity, Laser beam propagation

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Proceedings Article | 7 February 2015 Paper

Rapid measurement of the fiber’s transmission matrix

Robert Brüning, Daniel Flamm, Sandile Ngcobo, Andrew Forbes, Michael Duparré

Proceedings Volume 9389, 93890N (2015) https://doi.org/10.1117/12.2078695

KEYWORDS: Multiplexing, Superposition, Holography, Signal processing, Signal detection, Fiber characterization, Computer generated holography, Spatial light modulators, Step index fibers, Polarization

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Proceedings Article | 23 June 2014 Paper

How to make a digital laser

L. Burger, I. Litvin, S. Ngcobo, A. Forbes

Proceedings Volume 9257, 925706 (2014) https://doi.org/10.1117/12.2066248

KEYWORDS: Spatial light modulators, Resonators, Reflectivity, Mirrors, Phase shift keying, Amplitude modulation, Liquid crystals, Polarization, Laser resonators, Beam shaping

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Proceedings Article | 5 March 2014 Paper

Enhanced photo-transfection efficiency of mammalian cells on graphene coated substrates

Patience Mthunzi, Kuang He, Sandile Ngcobo, Jamie Warner

Proceedings Volume 8944, 89440K (2014) https://doi.org/10.1117/12.2040157

KEYWORDS: Graphene, Glasses, Stem cells, Acquisition tracking and pointing, Control systems, Femtosecond phenomena, In vitro testing, Plasma, Chemical vapor deposition, Copper

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Proceedings Article | 4 March 2014 Paper

Digital control of laser modes with an intra-cavity spatial light modulator

Sandile Ngcobo, Igor Litvin, Liesl Burger, Andrew Forbes

Proceedings Volume 8960, 89601X (2014) https://doi.org/10.1117/12.2038927

KEYWORDS: Digital holography, Modes of laser operation, Holograms, Spatial light modulators, Laser resonators, Holography, Mirrors, Beam controllers, Reflectivity, Resonators

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Proceedings Article | 4 March 2014 Paper

Tuneable Gaussian to flat-top resonator by amplitude beam shaping using a digital laser

Sandile Ngcobo, Kamel Ait-Ameur, Igor Litvin, Abdelkrim Hasnaoui, Andrew Forbes

Proceedings Volume 8960, 89601L (2014) https://doi.org/10.1117/12.2038960

KEYWORDS: Laser resonators, Digital holography, Fourier transforms, Opacity, Resonators, Gaussian beams, Mirrors, Spatial light modulators, Tunable lasers, Near field

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Proceedings Article | 4 March 2014 Paper

The digital laser: on-demand laser modes with the click of a button

A. Forbes, S. Ngcobo, L. Burger, I. Litvin

Proceedings Volume 8960, 89601K (2014) https://doi.org/10.1117/12.2048372

KEYWORDS: Spatial light modulators, Laser resonators, Modes of laser operation, Polarization, Mirrors, Digital holography, Holograms, Reflectivity, Diffraction, Phase shift keying

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Proceedings Article | 22 February 2013 Paper

Unraveling light with digital holograms

A. Forbes, C. Schulze, S. Ngcobo, D. Flamm, D. Naidoo, A. Dudley, M. Duparre

Proceedings Volume 8600, 86000U (2013) https://doi.org/10.1117/12.2010842

KEYWORDS: Digital holography, Holograms, Wavefronts, Superposition, Computer generated holography, Optical fibers, Spatial light modulators, Wavefront sensors, Semiconductor lasers, Structured light

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Proceedings Article | 22 February 2013 Paper

Selective excitation of higher-order modes in diode-pumped solid-state laser resonators

A. Forbes, S. Ngcobo, T. Godin, K. Ait-Ameur

Proceedings Volume 8600, 86000Y (2013) https://doi.org/10.1117/12.2011950

KEYWORDS: Mirrors, Resonators, Diode pumped solid state lasers, Photomasks, Nd:YAG lasers, Spherical lenses, Laser resonators, Beam propagation method, Crystals, Reflectivity

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Proceedings Article | 22 September 2011 Paper

Strong reducing of the laser focal volume

Thomas Godin, Sandile Ngcobo, Emmanuel Cagniot, Michael Fromager, Andrew Forbes, Kamel Aït-Ameur

Proceedings Volume 8130, 81300Q (2011) https://doi.org/10.1117/12.892150

KEYWORDS: Gaussian beams, Transmission electron microscopy, Laser applications, Diffractive optical elements, Super resolution, Spatial resolution, Microscopy, Diffraction, Prototyping, Confocal microscopy

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Proceedings Article | 9 September 2008 Paper

Laser beam propagation characteristics of incoherently added diode bars

Andrew Forbes, Sandile Ngcobo, Daniel Esser, Dieter Preussler, Christoph Bollig

Proceedings Volume 7062, 70621A (2008) https://doi.org/10.1117/12.793691

KEYWORDS: Diodes, Laser beam propagation, Semiconductor lasers, Beam splitters, Power meters, High power lasers, Beam propagation method, Polarizers, CCD cameras, Physics

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Showing 5 of 19 publications

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