Author:Litvin, IADate:Jun 2012In this work we investigate the behavior of the instantaneous Poynting vector of symmetrical paraxial laser beams, namely the modification of the instantaneous Poynting vector and the radiation pattern during propagation in free space for a ...Read more
Author:Roux, FSDate:Oct 2013Optical vortices are always created or annihilated as vortex dipoles — pairs with opposite topological charge. Here a quantity, consisting of the transverse first and second derivatives of the optical field, is derived with which one can ...Read more
Author:Naidoo, Darryl; Litvin, I; Laskin, A; Forbes, ADate:Feb 2014We explore an intra-cavity beam shaping approach to generate a Gaussian distribution by the metamorphosis of a Gaussian beam into a flat-top distribution on opposing mirrors. The concept is tested external to the cavity through the use of two ...Read more
Author:Boubaha, B; Naidoo, Darryl; Godin, T; Fromager, M; Forbes, A; Aït-Ameur, KDate:Aug 2013In this paper, we explore theoretically and experimentally the laser beam shaping ability resulting from the coaxial superposition of two coherent Gaussian beams (GBs). This technique is classified under interferometric laser beam shaping ...Read more
Author:Ngcobo, Sandile; Ait-Ameur, K; Forbes, ADate:Nov 2011The transformation of a Gaussian beam (GB) into a symmetrical higher order TEMp0 Laguerre Gaussian beam (LGB) intensity distribution of which is further rectified and transformed into a Gaussian intensity distribution in the plane of a ...Read more
Author:Ngcobo, Sandile; Forbes, A; Ait-Ameur, K; Mhlanga, TDate:Jul 2012The transformation of a Gaussian beam into a symmetrical TEMp0 Laguerre Gaussian beam (LGB) intensity distribution which has transverse superresolution properties is very useful in improving the spatial resolution of optical imaging microscopes ...Read more
Author:Masina, Bathusile N; Mwakikunga, Bonex W; Forbes, ADate:Apr 2013We outline an all-optical and noncontact approach for controlled laser heating and measurement of the resultant temperature distribution at the surface of a material, respectively. We show how the boundary conditions of the heating problem ...Read more