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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1005

Title: Comparison of infrared laser beam shaping by diffractive and refractive methods
Authors: Forbes, A
Du Plessis, A
Rohwer, EG
Keywords: DOEs
Refractive shaping
Infra-red laser beams
Beam propagation
Beam shaping
Issue Date: Aug-2005
Publisher: The International Society for Optical Engineering
Citation: Forbes, A, Du Plessis, A and Rohwer, EG. 2005. Comparison of infrared laser beam shaping by diffractive and refractive methods. Proceedings of SPIE, vol. 5876
Abstract: Infra-red laser beam shaping has the inherent difficulty that simple ray tracing methods often yield anomalous results, due primarily to the propagation effects at longer wavelengths. Techniques based on diffraction theory have been developed to overcome this, with associated parameters to determine when one approach is needed versus another. In this paper, infra-red (IR) beam shaping by diffractive methods is investigated and compared to refractive methods. Theoretical results on the beam shapers are calculated through a combination of analytical and numerical techniques, and using both ideal and non-ideal inputs. The authors show that the diffractive optical element (DOE) is remarkably resilient to input errors of wavelength and beam quality, while the refractive shaper is found to be difficult to model. Optical elements based on the two approaches were designed, and then fabricated from ZnSe. A comparison between the fabricated elements and the designed elements is presented, and some of the findings on practical problems in having such elements fabricated are highlighted.
Description: Copyright: 2005 The International Society for Optical Engineering
URI: http://hdl.handle.net/10204/1005
ISSN: 0277-786X
Appears in Collections:Laser physics and technology
Laser materials processing
General science, engineering & technology

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