Publications

Michael Sawannia, Madlen Borkmann, Patrick Herwig, Andreas Wetzig, Christian Hagenlocher, and Thomas Graf. Influence of beam oscillation on the melt flow during laser beam fusion cutting and the resulting cut quality. 2023. [PUMA: myown laser cutting processmonitoring goniometer]

André Loescher, Thomas Graf, and Marwan Abdou Ahmed. Generation of beams with axially-symmetric polarization: concepts and challenges. 2024. [PUMA: myown CW Laser AzimuthalPolarization UltrashortPulse RadialPolarization] URL

André Loescher, Florian Bienert, Lilia Pontagnier, Eric Cormier, Giorgio Santarelli, Annalisa Guandalini, Matthias Kemnitzer, Jürg Aus der Au, Thomas Graf, and Marwan Abdou Ahmed. Thin-disk multipass amplifier delivering picosecond pulses with kW average power and highly-flexible intra-burst repetition: from MHz to multi-GHz. 2023. [PUMA: myown multipassamplifier laser GHz ultrashortpulse] URL

Florian Bienert, Christoph Röcker, Thomas Graf, and Marwan Abdou Ahmed. Bending of Lloyd’s mirror to eliminate the period chirp in the fabrication of diffraction gratings. Optics Express, (32)10:18430, Optica Publishing Group, May 2024. [PUMA: myown laser peer] URL

Johannes Wahl, Christian Frey, Michael Sawannia, Simon Olschok, Rudolf Weber, Christian Hagenlocher, Andreas Michalowski, and Thomas Graf. Measurement of the influence of the vapor plume on laser beam characteristics during laser beam welding. 2023. [PUMA: YbYag myown Diagnostics Welding BeamCharacterisation Laser MacroMaterialProcessing ProcessDevelopement]

Johannes Wahl, Christian Frey, Michael Sawannia, Simon Olschok, Rudolf Weber, Christian Hagenlocher, Andreas Michalowski, and Thomas Graf. Measurement of the influence of the vapor plume on laser beam characteristics during laser beam welding. Fundamentals and Process Simulation, 2023. [PUMA: YbYag myown Diagnostics Welding BeamCharacterisation Laser MacroMaterialProcessing ProcessDevelopement]

Johannes Wahl, Christian Frey, John Powell, Felix Zaiß, Michael Haas, Simon Olschok, Christian Hagenlocher, Uwe Reisgen, and Thomas Graf. Characterizing the effect of the vapor plume on laser beam characteristics during laser beam welding. 2024. [PUMA: YbYag myown Diagnostics Welding BeamCharacterisation Laser MacroMaterialProcessing ProcessDevelopement]

Johannes Wahl, Christian Frey, John Powell, Felix Zaiß, Michael Haas, Simon Olschok, Christian Hagenlocher, Uwe Reisgen, and Thomas Graf. Characterizing the effect of the vapor plume on laser beam characteristics during laser beam welding. In Stefan Kaierle, and Klaus R. Kleine (Eds.), High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XIII, (12878)SPIE, March 2024. [PUMA: YbYag myown Diagnostics Welding BeamCharacterisation Laser MacroMaterialProcessing ProcessDevelopement] URL

Steffen Kramer, Kai Drechsel, Michael Jarwitz, Volker Schulze, and Frederik Zanger. Potential of contactless support structures for improving the part quality of AlSi10Mg PBF-LB parts. Fraunhofer Direct Digital Manufacturing Conference DDMC 2023, Bernhard Müller; Fraunhofer IWU, March 2023. [PUMA: myown Design laser AdditiveManufacturing Aluminium]

David Traunecker, Michael Haas, Michael Jarwitz, and Thomas Graf. Detection of pores during laser beam welding of AlMg3 using the temperature field. 2022. [PUMA: YbYAG myown Diagnostics Welding ProcessMonitoring Simulation Laser X-ray]

Christian Schmittner, André Löscher, Colin Reiff, Thomas Graf, and Marwan Abdou Ahmed. Fast switchable CW to ultrashort pulsed high-power laser beam from a single thin-disk multipass amplifier. In W. Andrew Clarkson, and Ramesh K. Shori (Eds.), Solid State Lasers XXXIII: Technology and Devices, SPIE, March 2024. [PUMA: TDMPA disk laser pulsed amplifer ultrasfast swtiching] URL

Christian Schmittner, André Löscher, Colin Reiff, Thomas Graf, and Marwan Abdou Ahmed. Fast switchable CW to ultrashort pulsed high-power laser beam from a single thin-disk multipass amplifier. 2024. [PUMA: TDMPA disk laser pulsed amplifer ultrasfast swtiching] URL

David Traunecker, Michael Jarwitz, Thomas Graf, and Andreas Michalowski. In-process determination of the local hardness during laser beam welding of steel. 2023. [PUMA: steel hardening myown ybyag welding diagnostics laser processmonitoring pyrometer]

David Traunecker, Michael Jarwitz, Andreas Michalowski, and Thomas Graf. Online determination of the local hardness during laser beam welding of steel. 2023. [PUMA: steel hardening myown ybyag welding diagnostics laser processmonitoring pyrometer]

Julian Holland, Rudolf Weber, Marc Sailer, and Thomas Graf. Pulse duration dependency of the x-ray emission during materials processing with ultrashort laser pulses. 2022. [PUMA: myown laser xRay ukp]

Michael Haas, Felix Zaiß, Jonas Wagner, Marc Hummel, Alexander Olowinsky, Felix Beckmann, Julian Moosmann, Christian Hagenlocher, and Andreas Michalowski. The change of the capillary shape during pore formation and its effect on process emissions. 2023. [PUMA: myown welding laser x-ray Pores processmonitoring]

Julian Holland, Rudolf Weber, Marc Sailer, and Thomas Graf. Pulse duration dependency of the x-ray emission during materials processing with ultrashort laser pulses. 2022. [PUMA: myown laser xRay ukp mikrobearbeitung]

Julian Holland, Christian Hagenlocher, Rudolf Weber, and Thomas Graf. Fast determination of beam properties of ultrafast lasers during materials processing using spectral X-ray. 2023. [PUMA: myown laser xRay ukp mikrobearbeitung]

Julian Holland, Rudolf Weber, and Thomas Graf. Fast spectral measurement of soft X-ray emission from ultrafast laser processing. 2023. [PUMA: myown laser xRay ukp]

Michael Haas, Felix Zaiß, Johannes Wahl, Christoph Spurk, Alexander Olowinsky, Felix Beckmann, Julian Moosmann, Christian Hagenlocher, and Andreas Michalowski. The influence of the capillary shape on process emissions. 2024. [PUMA: myown Welding ProcessMonitoring Capillary Laser X-ray Vapor]