Author:Naidoo, Darryl; Mafusire, C; Forbes, ADate:Jul 2009An optical aberration is a distortion of an image as compared to the object due to defects in an optical systemRead more
Author:Du Preez, NC; Forbes, A; Botha, LRDate:Sep 2009In this paper researchers present the design of a CO2 laser resonator that produces as the stable transverse mode a super–Gaussian laser beam. The resonator makes use of an intra–cavity diffractive mirror and a flat output coupler, generating ...Read more
Author:Forbes, A; Burger, L; Litvin, IADate:Jul 2006Laser brightness is a parameter often used to compare high power laser beam delivery from various sources, and incorporates both the power contained in the particular mode, as well as the propagation of that mode through the beam quality ...Read more
Author:Forbes, A; Du Preez, NC; Belyi, VN; Botha, LRDate:Aug 2009In this paper the researchers present results on improved paint stripping performance with an intra-cavity generated Flattened Gaussian Beam (FGB). A resonator with suitable diffractive optical elements was designed in order to produce a ...Read more
Author:Mafusire, CDate:Sep 2010A model is used to calculate the beam quality factor of a laser beam from Zernike coefficients. It is tested by programming aberration coefficients on a laser beam and measuring the beam quality using a Shack-Hartmann wavefront sensor. The ...Read more
Author:Dudley, Angela L; Vasilyeu, R; Forbes, A; Khilo, N; Ropot, P; Belyi, V; Kazak, NDate:Aug 2009This paper presents a mechanism for the generation of the superposition of higher-order Bessel beams, which implements a ring slit aperture and spatial light modulator (SLM). The experimental technique is also adapted to generate nondiffracting ...Read more