A dual process strategy to increase the ablation rate using GHz burstsWednesday (24.06.2020) 09:20 - 09:40 Room 1
Temporally and spatially confined melting with GHz burst
Fabian Nyenhuis, Andreas Michalowski, Johannes L'huillier
Pulse trains consisting of several ultra-short laser pulses, so-called bursts, are an interesting tool for strongly spatially and temporally localized melting. By adjusting the laser parameters such as the intra-burst delay or the pulse energy, it is possible to precisely control the melt volume and lifetime of the liquid phase. Due to the high peak intensities of the pulses, non-linear absorption is possible, which makes this method also suitable for photonic materials. Based on a heat conduction model, equations are derived to predict advantageous processing parameters. It is shown that intra-burst delay is a key parameter and that a delay in the GHz range is preferable for good thermal conductors. The applicability of bursts for surface treatments is evaluated on different materials with respect to energy efficiency and surface quality.
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