Prof. Horst Exner Profile

Prof. Horst Exner

Director at Laserinstitut Hochschule Mittweida

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Author

Publications (20)

Proceedings Article | 2 March 2020 Presentation + Paper

Laser-based manufacturing of 2.5D bodies of polylactide

Tina Viertel, Linda Pabst, Robby Ebert, Horst Exner

Proceedings Volume 11268, 112680G (2020) https://doi.org/10.1117/12.2550097

KEYWORDS: Micro cutting, 3D microstructuring, Ultrafast lasers, Absorption, Polymers, Pulsed laser operation, Laser manufacturing, Solids, Ultrafast phenomena

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Proceedings Article | 5 October 2015 Presentation

Monolithic integration of focused 2D GMR spin valve magnetic field sensor for high-sensitivity (compass) applications (Presentation Recording)

Olaf Ueberschär, Maria Almeida, Patrick Matthes, Mathias Müller, Ramona Ecke, Horst Exner, Stefan Schulz

Proceedings Volume 9551, 955129 (2015) https://doi.org/10.1117/12.2188001

KEYWORDS: Magnetic sensors, Sensors, Bridges, Magnetism, Signal to noise ratio, Optical alignment, Anisotropy, Spatial resolution, Temporal resolution, Integration

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Proceedings Article | 16 March 2015 Paper

High resolution laser micro sintering / melting using q-switched and high brilliant laser radiation

H. Exner, A. Streek

Proceedings Volume 9353, 93530P (2015) https://doi.org/10.1117/12.2083777

KEYWORDS: Laser sintering, Q switched lasers, Metals, Particles, Laser applications, Continuous wave operation, Coating, Molybdenum, Stochastic processes, Laser irradiation

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Proceedings Article | 6 March 2014 Paper

Study of fast laser induced cutting of silicon materials

S. Weinhold, A. Gruner, R. Ebert, J. Schille, H. Exner

Proceedings Volume 8967, 89671J (2014) https://doi.org/10.1117/12.2039819

KEYWORDS: Laser cutting, Semiconducting wafers, Silicon, Semiconductor lasers, Crystals, Laser crystals, Scanning electron microscopy, Laser processing, Laser applications, Laser ablation

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Proceedings Article | 6 March 2014 Paper

Selective realignment of the exchange biased magnetization direction in spintronic layer stacks using continuous and pulsed laser radiation

I. Berthold, M. Müller, R. Ebert, J. Schille, U. Löschner, H. Exner, P. Matthes, M. Albrecht

Proceedings Volume 8967, 89671F (2014) https://doi.org/10.1117/12.2039487

KEYWORDS: Magnetism, Pulsed laser operation, Continuous wave operation, Laser processing, Spintronics, Magnetic tracking, Sensors, Optical sensors, Polarization, Ferromagnetics

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Proceedings Article | 29 March 2013 Paper

Investigation of cw and ultrashort pulse laser irradiation of powder surfaces: a comparative study

Robby Ebert, Frank Ullmann, Joerg Schille, Udo Loeschner, Horst Exner

Proceedings Volume 8607, 86070X (2013) https://doi.org/10.1117/12.2006406

KEYWORDS: Femtosecond phenomena, Continuous wave operation, Laser processing, Laser irradiation, Tungsten, Plasma, Scanning electron microscopy, Ultrafast phenomena, Laser sintering, Particles

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Proceedings Article | 22 February 2013 Paper

High speed laser welding of steel using a high power single mode continuous wave fiber laser

J. Drechsel, U. Loeschner, S. Schwind, L. Hartwig, J. Schille, H. Exner, P. Huebner, A. Eysert

Proceedings Volume 8603, 86030L (2013) https://doi.org/10.1117/12.2003668

KEYWORDS: Laser welding, Laser processing, Plasma, Head, Fiber lasers, Photography, Continuous wave operation, Laser sources, Laser scanners, 3D scanning

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Proceedings Article | 22 February 2013 Paper

High-speed laser ablation cutting of metal

F. Ullmann, U. Loeschner, L. Hartwig, D. Szczepanski, J. Schille, S. Gronau, T. Knebel, J. Drechsel, R. Ebert, H. Exner

Proceedings Volume 8603, 860311 (2013) https://doi.org/10.1117/12.2006205

KEYWORDS: Laser cutting, Laser ablation, Plasma, Laser processing, Polygon scanners, Metals, Cameras, Scanning electron microscopy, Fiber lasers, Photomicroscopy

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Proceedings Article | 11 February 2011 Paper

Laser processing inside transparent materials: dependence on pulse length and wavelength

U. Loeschner, J. Schille, R. Ebert, H. Exner

Proceedings Volume 7926, 792606 (2011) https://doi.org/10.1117/12.874725

KEYWORDS: Glasses, Polymethylmethacrylate, Pulsed laser operation, Aspheric lenses, Polymers, Optical spheres, Optical microscopes, Absorption, Ultrafast phenomena, Electrons

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Proceedings Article | 25 February 2010 Paper

Laser microsintering of tungsten in vacuum

Robby Ebert, Frank Ullmann, Lars Hartwig, Tino Suess, Sascha Kloetzer, Andre Streek, Joerg Schille, Peter Regenfuss, Horst Exner

Proceedings Volume 7589, 75891G (2010) https://doi.org/10.1117/12.851877

KEYWORDS: Tungsten, Particles, Pulsed laser operation, Plasma, Polishing, Laser processing, Laser sintering, Process modeling, Metals, Light emitting diodes

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Proceedings Article | 25 February 2010 Paper

High repetition rate femtosecond laser processing of metals

Joerg Schille, Robby Ebert, Udo Loeschner, Patricia Scully, Nicholas Goddard, Horst Exner

Proceedings Volume 7589, 758915 (2010) https://doi.org/10.1117/12.842600

KEYWORDS: Laser ablation, Laser processing, Copper, Aluminum, Pulsed laser operation, Laser damage threshold, Metals, Laser energy, Laser applications, Thermal effects

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Proceedings Article | 15 January 2008 Paper

Laser micro sintering of SiO2 with an NIR-laser

A. Streek, P. Regenfuß, T. Süß, R. Ebert, H. Exner

Proceedings Volume 6985, 69850Q (2008) https://doi.org/10.1117/12.787121

KEYWORDS: Laser sintering, Silica, Ceramics, Silicon, Coating, Metals, Laser processing, Solids, Oxygen, Oxidation

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Proceedings Article | 16 August 2004 Paper

FEM calculations on laser bending of silicon with a moving laser source

Udo Loeschner, Horst Exner

Proceedings Volume 5455, (2004) https://doi.org/10.1117/12.544814

KEYWORDS: Silicon, Semiconductor lasers, Temperature metrology, Laser therapeutics, Finite element methods, Radiation effects, Metals, Reflection, Convection, Laser sources

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In this paper we are going to present FEM calculations applied for laser bending of silicon microstructures and compare them with our experimental results. According to the mechanisms in plastic deformation of metals with laser radiation we performed calculations to find out, if there are similar mechanisms in forming of silicon. To model the laser heating up mechanism we have to take into account several physical effects like heat radiation or reflection of silicon for the used laser radiation. To transform the laser bending process into a FE model the boundary conditions include compromises and simplifications of the geometry and the energy input. In our calculations we modelled the laser beam as a moving heat source in order to get information about the temperature distribution, the temperature gradient and the heat flow in dependence on the position on the sample and the time. The calculated essentially higher temperatures at the edges of the structure compared to the middle of the structure, exceeding the melting point there, are in very good agreement to the melting areas observed at the edges in the experi-ments. After a number of consecutive scans we reach a balanced temperature field moving with the laser beam across the surface. The calculations revealed that there is a steep temperature gradient in the depth of the structure indicating a similar temperature gradient mechanism observed in forming of metals with laser radiation. Additionally we carried out temperature field calculations to determine the influence of the process parameters like the laser power, the velocity of the heat source, the material thickness or the position of laser treatment on the temperature field generated in the material. The results of the calculations are in very good agreement with our experiments. Next time stress field calculations are intended. At the moment there are not enough data on the plastic behaviour of silicon available to the authors in order to get reliable results.

Proceedings Article | 18 November 2003 Paper

Selective laser micro sintering with a novel process

Horst Exner, Peter Regenfuss, Lars Hartwig, Sascha Kloetzer, Robby Ebert

Proceedings Volume 5063, (2003) https://doi.org/10.1117/12.540730

KEYWORDS: Laser sintering, Tungsten, Metals, Copper, Silver, Solids, Ceramics, Aluminum, Materials processing, Nd:YAG lasers

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Proceedings Article | 18 November 2003 Paper

Process assembly for µm-scale SLS, reaction sintering, and CVD

Robby Ebert, Peter Regenfuss, Sascha Kloetzer, Lars Hartwig, Horst Exner

Proceedings Volume 5063, (2003) https://doi.org/10.1117/12.540466

KEYWORDS: Laser sintering, Metals, Ceramics, Chemical vapor deposition, Tungsten, Gases, Solids, Molecular assembly, Coating, Aluminum

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Proceedings Article | 17 October 2003 Paper

Laser bending of silicon

Udo Loeschner, Horst Exner, Eva Gaertner, Joachim Fruehauf

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.472849

KEYWORDS: Silicon, Laser therapeutics, Semiconductor lasers, Laser applications, Microsystems, Chemical elements, Continuous wave operation, Information technology, Laser development

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Proceedings Article | 24 April 2003 Paper

Contactless laser bending of silicon microstructures

Horst Exner, Udo Loschner

Proceedings Volume 5116, (2003) https://doi.org/10.1117/12.498961

KEYWORDS: Silicon, Semiconductor lasers, Temperature metrology, Laser therapeutics, Laser applications, Laser processing, Chemical elements, Finite element methods, Continuous wave operation, Convection

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Proceedings Article | 24 April 2003 Paper

Microstructuring of Pyrex glass and polymers by excimer laser

Bernd Keiper, Robby Ebert, Rico Bohme, Horst Exner

Proceedings Volume 5116, (2003) https://doi.org/10.1117/12.499002

KEYWORDS: Glasses, Excimer lasers, Pulsed laser operation, Laser drilling, Semiconducting wafers, Polymers, Microsystems, Polymethylmethacrylate, Bridges, Laser processing

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Proceedings Article | 15 July 1999 Paper

Laser welding of functional and constructional ceramics for microelectronics

Horst Exner, Anne-Maria Nagel

Proceedings Volume 3618, (1999) https://doi.org/10.1117/12.352689

KEYWORDS: Ceramics, Laser welding, Laser applications, Metals, Laser development, Laser cutting, Microelectronics, Neodymium, Chemical elements, Laser processing

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Proceedings Article | 15 July 1999 Paper

Microstructuring of materials by pulsed-laser focusing and projection technique

Horst Exner, Bernd Keiper, Peter Meja

Proceedings Volume 3618, (1999) https://doi.org/10.1117/12.352696

KEYWORDS: Laser ablation, Excimer lasers, Pulsed laser operation, Glasses, Carbon dioxide lasers, Polymethylmethacrylate, Laser energy, Laser processing, Laser damage threshold, Silicon

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Showing 5 of 20 publications

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