Highlights of the 1 Conference on Laser Polishing ... - OSA Publishing

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Conference on Laser Polishing. LaP 2014, Aachen, Germany. E. Willenborg1, S. Heidrich1, A. Temmler2. 1Fraunhofer Institute for Laser Technology ILT, ...
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Classical Optics 2014 © 2014 OSA

Highlights of the 1st Conference on Laser Polishing LaP 2014, Aachen, Germany E. Willenborg1, S. Heidrich1, A. Temmler2 1

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Fraunhofer Institute for Laser Technology ILT, Steinbachstr. 15, 52074 Aachen, Germany Chair for Laser Technology LLT, RWTH Aachen University, Steinbachstr. 15, 52074 Aachen, Germany [email protected]

Abstract: In the last years, the number of scientific work groups engaged in laser polishing is continuously increasing. But still laser polishing is a niche. Scientific presentations and publications on laser polishing are spread over different conferences and journals. Aim of the 1st Conference on Laser Polishing is to present scientific and application related results on laser polishing, bring together the people working all over the world on laser polishing, and to promote and stimulate discussions and new cooperation. This paper gives an overview of the topics and presentations of the 1st Conference on Laser Polishing. OCIS codes: (350.3390) Laser materials processing; (220.5450) Polishing; (000.1780) Conferences, lectures, and institutes

1. Laser Polishing The surface roughness of a part or product strongly influences its properties and functions. Among these can be counted abrasion and corrosion resistance, tribological properties, optical properties, haptics as well as the visual impression the customer desires. Therefore, grinding and polishing techniques are widely used in industrial manufacturing in order to reduce the roughness of surfaces. A new method for polishing is polishing with laser radiation. In principle there are three different process variants which are schematically shown in Fig. 1 [1, 2]. At the top of Figure 1 a sketch of a cross-section of a milled surface is shown. With polishing by large-area ablation material is ablated over the whole surface. Thereby, the smoothing is achieved by increased ablation of the peaks of the surface and decreased ablation in the valleys, often supported by a shallow angle of incidence. This process variant is used e.g. for CVD diamond layers. In contrast, polishing by localized ablation requires a precise measurement device for measuring the initial surface profile. After a nominal / actual value comparison only the peaks of the profile are ablated by a controlled laser pattern. This process variant is under investigation for the form correction of glass optics. The third process variant is polishing by remelting. A thin surface layer is molten and the surface tension leads to a material flow from the peaks to the valleys. No material is removed but reallocated while molten. This is the most common process variant for laser polishing and can be used for metals, glasses and thermoplastics.

Fig. 1: Process variants of polishing with lasers

2. Conference LaP 2014 In the last years the number of scientific work groups engaged in laser polishing is continuously increasing. But still laser polishing is a niche. Scientific presentations and publications on laser polishing are spread over different conferences and journals. Aim of the 1st Conference on Laser Polishing is to present scientific and application related results on laser polishing, bring together the people working all over the world on laser polishing, and to promote and stimulate discussions and new cooperation. Main topics of the conference are:

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Classical Optics 2014 © 2014 OSA

Laser polishing of metals (functional surfaces, tools, dies, design surfaces, …) Laser polishing of glass and laser based processes for manufacturing optical surfaces Structuring by laser remelting (not structuring by ablation) As the conference is held from May 6 to 7, 2014 and the submission deadline for this summary paper is March, this paper can only give a prospect of the conference. 3. Conference Program Session I, Chair: Dr. André Temmler Welcome and Introduction, Dr. Edgar Willenborg Comparative analysis of laser polishing technology implementations Dr. Evgueni Bordatchev, NRC of Canada, Canada Machine tool and CAM-NC data chain for polishing complex shaped tools John Flemmer, Fraunhofer ILT, Germany Laser edge melting of push belts Dr. Thomas Kiedrowski, Robert Bosch GmbH, Germany Session II, Chair: Sebastian Heidrich An industrial approach of laser polishing with different laser sources, Dr. Eneko Ukar, Dept. of Mechanical Engineering, Univ. of Basque Country, Spain CO2-laser beam polishing of fused silica surfaces - process development and optimization Dr. Kerstin Hecht, Ernst-Abbe-Fachhochschule Jena, Germany Micro-shaping, polishing and damage repair of glass surfaces using focused infrared laser beams Dr. Manyalibo J. Matthews, Lawrence Livermore National Laboratory, USA Session III, Chair: Dr. Kerstin Hecht Usefulness of CO2 laser to remove scratches on large fused silica optics Dr. Philippe Cormont, Optical Fabrication Research Group, CEA CESTA, France Laser polishing and form correction of fused silica optics Sebastian Heidrich, Fraunhofer ILT, Germany Laser polishing: technological developments at National Research Council of Canada Dr. Evgueni Bordatchev, NRC of Canada, Canada Session IV, Chair: Dr. Evgueni Bordatchev A review of pulsed laser micro-polishing research at the University of Wisconsin-Madison Prof. Frank Pfefferkorn, Dept. of Mechanical Engineering, University of Wisconsin-Madison, USA Process- and material-induced surface structures during laser polishing Christian Nüsser, Fraunhofer ILT, Germany Laser polishing for topography management of accelerator cavity surfaces Prof. Michael Kelley, College of William & Mary and Thomas Jefferson National Accelerator Facility, USA Session V, Chair: Prof. Frank Pfefferkorn Laser polishing of aluminum with high energy laser pulses Prof. Harald Riegel, Laser Application Center, Aalen University, Germany Technology of laser polishing of titanium Dr. Victor Petrovskiy, National Nuclear Research University MEPHI, Russia Design surfaces by laser remelting Dr. André Temmler, Fraunhofer ILT, Germany Closing, Dr. Edgar Willenborg

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Classical Optics 2014 © 2014 OSA

4. References The papers to the 1st Conference on Laser Polishing LaP 2014 will be published in the journals Advanced Engineering Materials and Materials Science and Engineering Technology. All papers will be peer-reviewed. The publication is scheduled for mid-2014. [1] E. Willenborg, Polieren von Werkzeugstählen mit Laserstrahlung, Dissertation RWTH Aachen University, Shaker Verlag Aachen 2006 [2] R. Poprawe, Tailored Light 2: Laser Application Technology: (RWTHedition), ISBN 978-3642012365, Springer Verlag, 2011