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Browsing by Author "Forbes, A"

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  • Forbes, A; Schulze, C; Ngcobo, S; Flamm, D; Naidoo, Darryl; Dudley, Angela L; Duparre, M (SPIE Proceedings, 2013-02)
    Modal decomposition of optical fields as a concept has been in existence for many decades, yet despite its clear applications to laser beam analysis it has nevertheless remained a seldom used tool. With the commercialization ...
  • Mhlanga, T; Dudley, Angela L; Lavery, M; Padgett, M; Forbes, A (2013-07)
    This study reports on the presentation of the 59th South African Institute of Physics Conference Unravelling Bessel beams.
  • Sephton, Bereneice C; Dudley, Angela L; Forbes, A (Optical Society of America (OSA), 2016-10)
    Q-plates are commonly used for uncomplicated generation of polarization controlled vortex beams. Here we show experimentally that the output is not a pure vortex but rather a Hypergeometric-Gaussian mode. Results are in ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (2009-06)
    The graded index (GRIN-like) medium generated by a gas inside a heated pipe when it is rotated about its longitudinal axis has the ability to focus a laser beam. However, recent research has shown that the medium generated ...
  • Schulze, C; Naidoo, Darryl; Flamm, D; Schmidt, OA; Forbes, A; Duparr, M (Optical Society of America, 2012-08)
    We propose a new method to determine the wavefront of a laser beam based on modal decomposition by computer-generated holograms. The hologram is encoded with a transmission function suitable for measuring the amplitudes ...
  • Dudley, Angela L; Milione, G; Alfano, RR; Forbes, A (SPIE, 2014-09-25)
    A long-standing question in optics has been to efficiently measure the phase (or wavefront) of an optical field. This has led to numerous publications and commercial devices such as phase shift interferometry, wavefront ...
  • Forbes, A; Du Plessis, A; Rohwer, EG (2006-07)
    Wavelength tuneability is demonstrated both experimentally and numerically. Refractive element shows some anomalies, intensity correctly reproduced, but not phase. Future work will consider impact of beta on performance of designs
  • Degama, MP; Forbes, A (Society of Photo-optical Instrumentation Engineers (SPIE), 2010-07)
    This paper presents a beam shaping device namely, a Diffractive Optical Element (DOE), which is used to change a beam having a Gaussian intensity profile into a beam with a uniform intensity profile. The DOE used in this ...
  • Spangenberg, D-M; Dudley, Angela L; Neethling, PH; Rohwer, EG; Forbes, A (Optical Society of America, 2014)
    Spatial light modulators are ubiquitous tools for wavefront control and laser beam shaping but have traditionally been used with monochromatic sources due to the inherent wavelength dependence of the calibration process ...
  • Mredlana, Prince; Naidoo, Darryl; Mafusire, C; Kruger, T; Dudley, Angela; Forbes, A (2016-07)
    Optical field characterisation often requires various isolated experiments to obtain characterisation parameters, we investigate a novel approach to characterise an optical field employing a Wigner distribution function ...
  • Long, CS; Loveday, PW; Forbes, A (SpringerVerlag, 2012-04)
    Piezoelectric bimorph- or unimorph-type deformable mirrors are commonly used in adaptive optics to correct for time-dependent phase aberrations. In the optics community, the surface deformations that deformable mirrors are ...
  • Long, CS; Loveday, PW; Forbes, A (Springer Verlag, 2012-04)
    Piezoelectric bimorph- or unimorph-type deformable mirrors are commonly used in adaptive optics to correct for time-dependent phase aberrations. In the optics community, the surface deformations that deformable mirrors are ...