Investigation and application of laser induced surface functionalization with pulse delays between 40ns and 50μs on silicon and steel foils
Conference on Lasers in Manufacturing (LiM)
Laser induced quasi-periodic cone-like surface structures contribute to the functionalization of material surfaces. The resulting topography depends on manifold laser and ambient process parameters. In this study, the fundamental influence of a pulse delay between 40ns and 50μs has been investigated for the laser processing of silicon. During the processing, parameters of laser fluence and pulse overlap were set at constant condition used in the three laser systems. As the results, laser induced surface topographies are visualized by microscopy and analyzed with self-developed image processing tools to determine cone distance and cone density. The obtained knowledge from laser-induced quasi-periodic cone-like structuring helps to develop laser processes for various applications and materials, e.g. for photovoltaics or in medicine. In an exemplary case the surface functionalization is demonstrated for cathodes on steel foil.