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High precision laser processing of steel surfaces with sub-ns-lasers

: Brüning, S.; Jenke, G.; Du, G.; Gillner, A.


Schmidt, F.:
Laser Assisted Net Shape Engineering 8 : International Conference on Photonic Technologies, Proceedings of the LANE 2014, September 08-11, 2014, Fürth, Germany
Amsterdam: Elsevier, 2014 (Physics Procedia 56.2014)
International Conference on Laser Assisted Net Shape Engineering (LANE) <8, 2014, Fürth>
International Conference on Photonic Technologies <2014, Fürth>
Konferenzbeitrag, Zeitschriftenaufsatz
Fraunhofer ILT ()

Ultrashort pulsed lasers like ps- and fs-lasers with single pulses and pulse bursts allow a high ablation rate combined with a superior quality for several materials like copper and brass as well as glass and dielectrics.In case of steel surfaces this known quality could not be transferred, because after a defined ablation depth the surface roughness increases. An increased roughness is mainly caused by a growing area of cone like protrusion structures (CLP) with increasing of the ablation depth. To avoid this phenomenon a melt concomitant ablation, due to some 100ps pulse duration was applied with a moderate pulse energy of 30 μJ. The results show no CLP structures and a decreased surface roughness in combination with an acceptable recrystallization of melt residues around the ablation area. The non-melt-free ablation process with residual molten volume caused by the longer pulse duration (compared to USP-lasers) has to be compensated through a higher laser power. This investigation shows an approach with a parallelization of several separate modulated laser spots for increasing the processing speed.