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Optical Engineering • Open Access

Gas-assisted laser cutting of medium-section metals using spherically aberrated beams
Author(s): Vladimir I. Yurevich; Viacheslav A. Grimm; Igor V. Polyakov; Andrey A. Afonyushkin; Sergey G. Gorny

Paper 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.

Paper Details

Date Published: 10 April 2015
PDF: 9 pages
Opt. Eng. 54(4) 044103 doi: 10.1117/1.OE.54.4.044103
Published in: Optical Engineering Volume 54, Issue 4
Show Author Affiliations
Vladimir I. Yurevich, Laser Ctr. (Russian)
Saint Petersburg National Univ. of Information Technologies (Russian)
Viacheslav A. Grimm, ITMO Univ. (Russian)
Igor V. Polyakov, Laser Ctr. (Russian Federation)
Andrey A. Afonyushkin, Laser Ctr. (Russian)
Saint Petersburg National Univ. of Information Technologies (Russian)
Sergey G. Gorny, Laser Ctr. (Russian Federation)

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