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10 April 2015 Gas-assisted laser cutting of medium-section metals using spherically aberrated beams
Vladimir I. Yurevich, Viacheslav A. Grimm, Igor V. Polyakov, Andrey A. Afonyushkin, Sergey G. Gorny
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Optical Engineering, Vol. 54, Issue 4, 044103 (April 2015). https://doi.org/10.1117/1.OE.54.4.044103
Abstract
We analyzed the effects of the focal point aberrational offset in optical transport systems for high-power lasers. Transverse and near-axial laser intensity distribution transformations in the presence of both positive and negative spherical aberrations were numerically calculated and experimentally demonstrated for different strengths. We show that spherical aberration yields considerable asymmetry of the focused beam’s caustic. Several optical transport systems with identical optical parameters (excluding the noncorrected axial beam spherical aberration) were designed. We examined the effects of the laser intensity profiles produced by these systems on the quality of oxygen-assisted laser cutting of medium-section mild steel. We show that high-quality cuts can be obtained for different shapes of laser intensity distribution. However, the greater the refocusing magnitude introduced by the spherical aberration correction, the more precisely the focal point position must be maintained during the laser cutting process.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Vladimir I. Yurevich, Viacheslav A. Grimm, Igor V. Polyakov, Andrey A. Afonyushkin, and Sergey G. Gorny "Gas-assisted laser cutting of medium-section metals using spherically aberrated beams," Optical Engineering 54(4), 044103 (10 April 2015). https://doi.org/10.1117/1.OE.54.4.044103
Published: 10 April 2015
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KEYWORDS
Laser cutting
Laser induced damage
Beam shaping
Metals
Monochromatic aberrations
Distortion
Adaptive optics
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