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Browsing by Subject "Gaussian beams"

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The behavior of the instantaneous Poynting vector of symmetrical laser beams

Author: Litvin, IA Date: Jun 2012 In 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
How to distinguish between the annihilation and the creation of optical vortices

Author: Roux, FS Date: Oct 2013 Optical 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
Intra-cavity metamorphosis of a Gaussian beam to flat-top distribution

Author: Naidoo, Darryl ; Litvin, I ; Laskin, A ; Forbes, A Date: Feb 2014 We 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
Spatial properties of coaxial superposition of two coherent Gaussian beams

Author: Boubaha, B ; Naidoo, Darryl ; Godin, T ; Fromager, M ; Forbes, A ; Aït-Ameur, K Date: Aug 2013 In 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
Superresolution beams

Author: Ngcobo, Sandile ; Ait-Ameur, K ; Forbes, A Date: Nov 2011 The 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
Superresolution beams

Author: Ngcobo, Sandile ; Forbes, A ; Ait-Ameur, K ; Mhlanga, T Date: Jul 2012 The 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
Targeted femtosecond laser driven drug delivery within HIV-1 infected cells: In-vitro studies [conference paper]

Author: Maphanga, Charles P ; Ombinda-Lemboumba, Saturnin ; Manoto, Sello L ; Maaza, Malik ; Mthunzi-Kufa, Patience Date: Jan 2017 Human immunodeficiency virus (HIV-1) infection still remains one amongst the world’s most challenging infections since its discovery. Antiretroviral therapy is the recommended treatment of choice for HIV-1 infection taken by patients orally. ... Read more
Thermally induced damage studies with shaped light

Author: Masina, Bathusile N ; Mwakikunga, Bonex W ; Forbes, A Date: Apr 2013 We 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

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Browsing by Subject "Gaussian beams"

Browsing by Subject "Gaussian beams"

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