Role of the intensity profile in femtosecond laser surface texturing: An experimental study

• DOI: 10.1016/j.apsadv.2021.100136
• Publication Date: 2021-07-10T21:27:15Z
• Authors: Aurélien Sikora; Simon Nourry; Marc Faucon; Bruno Chassagne; Rainer Kling; Girolamo Mincuzzi
• Keywords: Gaussian beam; Intensity

Femtosecond Laser Induced Surface Structures evolve from ripples to spikes upon the increase of energy dose Φ. Nevertheless, for a fixed Φ, several process parameters (pulse energy, repetition rate, average power, overlapping, etc.) play an important role in determining resulting morphology. Here we show that beam intensity profile Î as well has bearing on structures morphology evolution. In case Gaussian beam, been modified by varying size d. We observed stationary and Φ value, passing d = 13 µm 200 makes possible transition spikes. This is made energetically advantageous using Top Hat profile. Compared wide 62 reduces 10 required yield similar surface (coexistence micro-groves). Confirming these results over large could further validate shaping key approach both fully exploit output power state art, kW class, femtosecond laser whilst increasing texturing throughput.