Publications

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, 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, 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 Michel, Nico Ulff, Manuel Henn, Brian Simonds, Peter Hosemann, Frederik Zanger, Christian Hagenlocher, and Thomas Graf. Adjusting the microstructure of additively manufactured parts with tailored temperature fields by the combination of powder bed fusion with cw-laser and ablation with ultrashort laser pulses. In Bo Gu, and Hongqiang Chen (Eds.), Laser 3D Manufacturing XI, (12876)SPIE, March 2024. [PUMA: Heat-dissipatingStructures myown Heat-dissipatinStructures PBF-LB/M Heat-dissipating Ablation Solidification USP with Simulation Additive AdditiveManufacturing of AlSi10Mg field structures UltrashortPulse manufacturing Microstructure temperature] URL

Johannes Michel, Nico Ulff, Manuel Henn, Brian Simonds, Peter Hosemann, Frederik Zanger, Christian Hagenlocher, and Thomas Graf. Adjusting the microstructure of additively manufactured parts with tailored temperature fields by the combination of powder bed fusion with cw-laser and ablation with ultrashort laser pulses. In Bo Gu, and Hongqiang Chen (Eds.), SPIE, 2024. [PUMA: Heat-dissipatingStructures myown PBF-LB/M Ablation Solidification Simulation AdditiveManufacturing AlSi10Mg UltrashortPulse Microstructure]

Johannes Michel, Frauke Holder, Jonas Wagner, Felix Zaiß, Christian Hagenlocher, Rudolf Weber, and Thomas Graf. Reduction of transverse hot cracks by means of compressive stresses during laser welding of high strength aluminum alloys with high feed rates. Fundamentals and Process Simulation, 2023. [PUMA: for: ifsw myown CompressiveStres LaserBeamWelding AluminumAlloys TransverseHotCracking ElectromobilityApplications]

Johannes Michel, Frauke Holder, Jonas Wagner, Felix Zaiß, Christian Hagenlocher, Rudolf Weber, and Thomas Graf. Reduction of transverse hot cracks by means of compressive stresses during laser welding of high strength aluminum alloys with high feed rates. 2023. [PUMA: myown CompressiveStres LaserBeamWelding AluminumAlloys TransverseHotCracking ElectromobilityApplications]

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

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

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

Daniel Holder, Christian Hagenlocher, Rudolf Weber, Christoph Röcker, Marwan Abdou Ahmed, and Thomas Graf. Model for designing process strategies in ultrafast laser micromachining at high average powers. Materials & Design, (242)113007Elsevier BV, 2024. [PUMA: ifsw myown ablation peer] URL

Daniel Holder, Rudolf Weber, Christian Hagenlocher, and Thomas Graf. Analytical model for the calculation of the depth progress of V-shaped grooves obtained by laser ablation with ultrashort pulses. 2023. [PUMA: ifsw myown]

Alexander Peter, Adrian H.A. Lutey, Sebastian Faas, Luca Romoli, Volkher Onuseit, and Thomas Graf. Direct laser interference patterning of stainless steel by ultrashort pulses for antibacterial surfaces. Optics & Laser Technology, (123):105954, Elsevier BV, March 2020. [PUMA: myown] URL

Manuel Henn, Lukas Schneller, Daniel Holder, Dennis Haasler, Marc Hummel, Felix Beckmann, Julian Moosmann, Christian Hagenlocher, and Thomas Graf. Unveiling laser percussion drilling in metals with ultrashort pulses: insights from high-speed synchrotron x-ray imaging on microhole formation and side channel phenomena. In Rainer Kling, Wilhelm Pfleging, and Koji Sugioka (Eds.), 2024. [PUMA: myown ablation x-ray ultrashort nondestructive drilling diagnostics micromaterialprocessing pulse stainlesssteel processmonitoring] URL

Manuel Henn, Matthias Buser, Daniel Holder, Christian Hagenlocher, and Thomas Graf. Exceeding the Limits in Laser Materials Processing by Bridging Additive and Subtractive Manufacturing with Continuous Wave and Ultrashort Pulsed Lasers - Manufacturing of Parts with Undercuts. 2024. [PUMA: myown ablation additivemanufacturing micromaterialprocessing ultrashort selectivelasermeltingslm macromaterialprocessing pulse processdevelopment] URL

Manuel Henn, Christian Hagenlocher, Daniel Holder, Daniel J. Förster, Rudolf Weber, Dennis Haasler, Marc Hummel, Alexander Olowinsky, Felix Beckmann, Julian Moosmann, and Thomas Graf. The progress of microhole formation during laser percussion drilling of steel observed by highspeed synchrotron x-ray imaging. 2023. [PUMA: myown ablation diagnostics x-ray micromaterialprocessing nondestructive ultrashortpulse stainlesssteel drilling processmonitoring] URL

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]

Stefan Esser, Wei Jing, Xiaodong Xu, Thomas Graf, and Marwan Abdou Ahmed. First thin-disk oscillator with ceramic Yb:LuScO3 in comparison to the operation with ceramic Yb:Lu2O3. Applied Physics B, (130)6:98, May 14, 2024. [PUMA: myown Yb:LuScO3 ceramic peer thindisklaser] URL

Daniel Holder, Manuel Henn, Alexander Peter, Sebastian Faas, Anne Feuer, Christian Freitag, Rudolf Weber, Volkher Onuseit, and Thomas Graf. Ultrafast laser applications in the kW‐class: From drilling and cutting to surface structuring and micromilling. PhotonicsViews, (19)3:40–46, Wiley, June 2022. [PUMA: myown] URL

Daniel Holder, Manuel Henn, Matthias Buser, Christian Hagenlocher, Volkher Onuseit, and Thomas Graf. Bridging additive and subtractive manufacturing: Exceeding the limits of conventional manufacturing with combined continuous‐wave and ultrafast lasers. PhotonicsViews, (21)3:50–53, Wiley, May 2024. [PUMA: myown] URL