📝 SummarXiv

Abstract

Ultrashort (femtosecond, fs) laser pulses have fascinating properties as they allow to confine optical energy on extreme scales in space and time. Such fs-laser pulsed beams can be seen as spatially thin slices of intense light that are radially and axially constrained to the micrometer scale, while simultaneously propagating at the extremely high speed of light. Their high peak intensities and their short time lapse makes such laser pulses unique tools for materials processing, as their duration is shorter than the time required to transfer absorbed optical energy, via electron-phonon coupling, from the electronic system of the solid to its lattice. Hence, the laser pulse energy remains localized during the interaction and does not spread via diffusion into the area surrounding the irradiated region. As one consequence, the fs-laser thus offers increased precision for material modification or ablation accompanied by a reduced heat-affected zone of only a few hundred nanometers. On the other hand, the high laser peak intensities can enable nonlinear material interactions that are rendering unique material excitation and relaxation pathways possible. In this chapter, we briefly review the reasons for the enormous success of ultrashort pulse lasers in materials processing - both for the processing of the surface or in the bulk of solids. We identify the underlying fundamental processes that can limit the precision or the up-scaling of the laser processing towards large volumes, areas, or processing rates. Strategies to overcome such limitations will be outlined and questions on the ultimate limits of laser material processing will be answered.