Lorbeer Raoul-Amadeus, Pastow Jan, Sawannia Michael, Klinkenberg Peter, Förster Daniel Johannes, Eckel Hans-Albert
German Aerospace Center (DLR), Institute of Technical Physics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany.
Institut für Strahlwerkzeuge, University of Stuttgart, Pfaffenwaldring 43, 70569 Stuttgart, Germany.
Materials (Basel). 2017 Dec 29;11(1):50. doi: 10.3390/ma11010050.
Ablating surfaces with a pulsed laser system in milling processes often leads to surface changes depending on the milling depth. Especially if a constant surface roughness and evenness is essential to the process, structural degradation may advance until the process fails. The process investigated is the generation of precise thrust by laser ablation. Here, it is essential to predict or rather control the evolution of the surfaces roughness. Laser ablative milling with a short pulse laser system in vacuum (≈1 Pa) were performed over depths of several 10 µm documenting the evolution of surface roughness and unevenness with a white light interference microscope. Power spectral density analysis of the generated surface data reveals a strong influence of the crystalline structure of the solid. Furthermore, it was possible to demonstrate that this effect could be suppressed for gold.
在铣削过程中，使用脉冲激光系统烧蚀表面通常会导致表面变化，这取决于铣削深度。特别是如果恒定的表面粗糙度和均匀性对该过程至关重要，结构退化可能会持续发展，直到过程失败。所研究的过程是通过激光烧蚀产生精确的推力。在此，预测或更确切地说是控制表面粗糙度的演变至关重要。在真空（≈1 Pa）中使用短脉冲激光系统进行激光烧蚀铣削，深度达几十微米，并用白光干涉显微镜记录表面粗糙度和不均匀性的演变。对生成的表面数据进行功率谱密度分析，揭示了固体晶体结构的强烈影响。此外，还能够证明这种效应在金的情况下可以被抑制。
