用超短脉冲Laser扫描表面结构的基本原理：从电子扩散到最终形态
Fundamentals of Scanning Surface Structuring by Ultrashort Laser Pulses: From Electron Diffusion to Final Morphology
摘要：
超短脉冲表面结构化的工业应用将通过有效利用目前可用的平均激光功率而显著增加。然而，在高平均激光功率下用大量脉冲处理的表面的无法解释的退化使得这变得困难。基于系统的实验研究，这种表面降解的结构形成进行了研究。我们提出了一个分层结构形成模型，弥合激光诱导的周期性表面结构和表面退化之间的差距。与基于先前研究的预期相反，我们观察到高激光能量密度下钛上的结构形成较少。作为一个可能的原因，增强的电子扩散强度增加的两个温度模型的框架内进行了研究。我们的研究结果提供了一个更深入的了解与超短脉冲的表面结构的微观机制。
英文摘要：
Industrial use of ultrashort-pulse surface structuring would significantly increase by an effective utilization of the average laser powers available currently. However, the unexplained degradation of surfaces processed with numerous pulses at high average laser power makes this difficult. Based on a systematic experimental study, the structure formation underlying such surface degradation was investigated. We presented a hierarchical structural formation model that bridges the gap between laser-induced periodic surface structures and surface degradation. Contrary to expectations based on previous research, we observed less structure formation on titanium for high laser fluences. As a possible reason, enhanced electron diffusion with increasing intensity was investigated within the framework of the two-temperature model. Our findings provide a deeper understanding of the microscopic mechanisms involved in surface structuring with ultrashort pulses.
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