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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/6276

Title: Generation of high order modes
Authors: Ngcobo, S
Ait-Ameur, K
Forbes, A
Keywords: Diffractive optical element
Laguerre Gaussian beams
Beam shaping
Issue Date: Jul-2012
Citation: Ngcobo, S, Ait-Ameur, K and Forbes, A. Generation of high order modes. 57th Annual Conference of the South African Institute of Physics, Pretoria, 9-13 July 2012
Series/Report no.: Workflow;9673
Abstract: This work deals with the generation of symmetrical high order Laguerre Gaussian modes. These high order Laguerre-Gaussian beams are generated by forcing the laser using an annular binary Diffractive Optical Element whose geometry is in connection with the location of the Laguerre polynomial zeros. The Diffractive optical element is used to shape the TEM00 Gassian beam and force the laser to operate on a higher order TEMp0 Laguerre-Gaussian modes or high order superposition of Laguerre-Gaussian modes. In this presentation we will show some different methods that we have employed for generating these high order Laguerre Gaussian modes using annular binary Diffractive Optical Elements of multi rings and single ring method. The characterization of these high order Laguerre Gaussian modes using Fourier Transformation, Modal Decomposition Method and Beam quality factor M2 measurements will show that they are of high purity.
Description: 57th Annual Conference of the South African Institute of Physics, Pretoria, 9-13 July 2012
URI: http://hdl.handle.net/10204/6276
Appears in Collections:Laser physics and technology
General science, engineering & technology

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