%0 Conference Paper %1 henn2024unveiling %A Henn, Manuel %A Schneller, Lukas %A Holder, Daniel %A Haasler, Dennis %A Hummel, Marc %A Beckmann, Felix %A Moosmann, Julian %A Hagenlocher, Christian %A Graf, Thomas %B Laser-based Micro- and Nanoprocessing XVIII %D 2024 %E Kling, Rainer %E Pfleging, Wilhelm %E Sugioka, Koji %I SPIE %K %N 1287309-1 %R 10.1117/12.3003661 %T Unveiling laser percussion drilling in metals with ultrashort pulses: insights from high-speed synchrotron x-ray imaging on microhole formation and side channel phenomena %U http://dx.doi.org/10.1117/12.3003661 %V 12873 %X The comprehension of microhole formation during percussion drilling of metals using ultrashort laser pulses is still limited. The shape of a microhole can be impacted by factors like heat accumulation, the emergence of side channels, bending, and bulging. Understanding these defects is challenging due to constraints in conventional diagnostics. To address this issue, high-speed synchrotron X-ray imaging was employed to capture the spatial and temporal evolution of the microhole shape during laser percussion drilling of stainless steel. The recorded images reveal that heat accumulation leads to the creation of a melt film on the microhole walls, exhibiting dynamic fluctuations throughout the drilling process. Furthermore, a transversal widening or bulging of the microhole can be seen later in the process. Additionally, the emergence of side channels was observed in the region of maximum drilling depth, where the overall fluence on the microhole walls falls below the threshold fluence.

@inproceedings{henn2024unveiling, abstract = {The comprehension of microhole formation during percussion drilling of metals using ultrashort laser pulses is still limited. The shape of a microhole can be impacted by factors like heat accumulation, the emergence of side channels, bending, and bulging. Understanding these defects is challenging due to constraints in conventional diagnostics. To address this issue, high-speed synchrotron X-ray imaging was employed to capture the spatial and temporal evolution of the microhole shape during laser percussion drilling of stainless steel. The recorded images reveal that heat accumulation leads to the creation of a melt film on the microhole walls, exhibiting dynamic fluctuations throughout the drilling process. Furthermore, a transversal widening or bulging of the microhole can be seen later in the process. Additionally, the emergence of side channels was observed in the region of maximum drilling depth, where the overall fluence on the microhole walls falls below the threshold fluence.}, added-at = {2024-05-07T23:12:02.000+0200}, author = {Henn, Manuel and Schneller, Lukas and Holder, Daniel and Haasler, Dennis and Hummel, Marc and Beckmann, Felix and Moosmann, Julian and Hagenlocher, Christian and Graf, Thomas}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/289f76b3aa5320b1d6d6b2b84080c1475/manuelhenn}, booktitle = {Laser-based Micro- and Nanoprocessing XVIII}, doi = {10.1117/12.3003661}, editor = {Kling, Rainer and Pfleging, Wilhelm and Sugioka, Koji}, eventtitle = {LASE, Photonics West}, interhash = {bc55142d39b406391173f3bacf6629a2}, intrahash = {89f76b3aa5320b1d6d6b2b84080c1475}, keywords = {}, month = mar, number = {1287309-1}, publisher = {SPIE}, series = {Proc. SPIE}, timestamp = {2024-05-07T21:12:02.000+0200}, title = {Unveiling laser percussion drilling in metals with ultrashort pulses: insights from high-speed synchrotron x-ray imaging on microhole formation and side channel phenomena}, url = {http://dx.doi.org/10.1117/12.3003661}, venue = {San Francisco, California, United States}, volume = 12873, year = 2024 }