Marins Almeida Francisco Udo, Voisiat Bogdan, Tabares Ignacio, Ränke Fabian, Lasagni Andrés Fabián
Institute of Manufacturing, Technische Universität Dresden, George‑Bähr Str. 3c, 01069, Dresden, Germany.
Fraunhofer Institut für Werkstoff und Strahltechnik IWS, Winterbergstr. 28, 01277, Dresden, Germany.
Sci Rep. 2025 Jun 25;15(1):20285. doi: 10.1038/s41598-025-07657-4.
This study explores the influence of the polarization angle on the formation of Laser-Induced Periodic Surface Structures (LIPSS) during Direct Laser Interference Patterning (DLIP) and its impact on ablation efficiency in stainless steel and aluminum 2024 substrates. Two pulse durations, 12 ps and 70 ps, with a laser wavelength of 1064 nm, are employed at varying accumulated fluences to evaluate their effects on the surface structuring process. The results demonstrate that the Low Spatial Frequency LIPSS (LSFL) orientation with respect to the line-like structures produced by two-beam DLIP is strongly influenced by the polarization angle and the alignment of DLIP features. In addition, the spatial period of LSFL in stainless steel remained relatively stable regardless of the polarization angle (~ 900-1000 nm), whereas in aluminum 2024, it exhibited significant variation, decreasing from approximately 920 nm to 506 nm as the LSFL rotated. The polarization angle also affected the reached structure depth at constant irradiation conditions, particularly in stainless steel, where greater depths were achieved when the LSFL aligned perpendicularly to DLIP lines (over 50% variation). These findings provide valuable insights for optimizing laser-based surface processing techniques for metallic substrates.
本研究探讨了偏振角对直接激光干涉图案化（DLIP）过程中激光诱导周期性表面结构（LIPSS）形成的影响及其对不锈钢和2024铝合金基底烧蚀效率的影响。采用两种脉冲持续时间，即12 ps和70 ps，激光波长为1064 nm，以不同的累积通量来评估它们对表面结构化过程的影响。结果表明，低空间频率LIPSS（LSFL）相对于双光束DLIP产生的线状结构的取向受到偏振角和DLIP特征排列的强烈影响。此外，不锈钢中LSFL的空间周期无论偏振角如何都保持相对稳定（约900 - 1000 nm），而在2024铝合金中，随着LSFL旋转，它表现出显著变化，从约920 nm减小到506 nm。在恒定辐照条件下，偏振角也会影响达到的结构深度，特别是在不锈钢中，当LSFL垂直于DLIP线排列时可达到更大的深度（变化超过50%）。这些发现为优化金属基底的激光表面加工技术提供了有价值的见解。
