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Proceedings Paper

Generation of doughnut spot for high-power laser technologies using refractive beam shaping
Author(s): Alexander Laskin; Vadim Laskin; Aleksei Ostrun
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Paper Abstract

Doughnut and inverse-Gauss intensity distributions of laser spot are required in laser technologies like welding, cladding where high power fiber coupled diode or solid-state lasers as well as fiber lasers are used. In comparison to Gaussian and flat-top distributions the doughnut and inverse-Gauss profiles provide more uniform temperature distribution on a work piece – this improves the technology, increase stability of processes and efficiency of using the laser energy, reduce the heat affected zone (HAZ). This type of beam shaping has become frequently asked by users of multimode lasers, especially multimode fiber coupled diode lasers. Refractive field mapping beam shapers are applied as one of solutions for the task to manipulate intensity distribution of multimode lasers. The operation principle of these devices presumes almost lossless transformation of laser beam irradiance from Gaussian to flat-top, doughnut or inverse-Gauss through controlled wavefront manipulation inside a beam shaper using lenses with smooth optical surfaces. This paper will describe some design basics of refractive beam shapers of the field mapping type and optical layouts of their applying with high-power multimode lasers. Examples of real implementations and experimental results will be presented as well.

Paper Details

Date Published: 9 March 2015
PDF: 8 pages
Proc. SPIE 9356, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV, 935609 (9 March 2015); doi: 10.1117/12.2081455
Show Author Affiliations
Alexander Laskin, AdlOptica Optical Systems GmbH (Germany)
Vadim Laskin, AdlOptica Optical Systems GmbH (Germany)
Aleksei Ostrun, National Research Univ. of Information Technologies, Mechanics and Optics (Russian Federation)

Published in SPIE Proceedings Vol. 9356:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV
Friedhelm Dorsch, Editor(s)

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