Impact of evolving surface nanoscale topologies in femtosecond laser structuring of Ni-based superalloy CMSX-4
Résumé
We investigate the role of surface nanoscale topographies in the inhomogeneous coupling of
laser radiation to Ni-based superalloy CMSX-4 surfaces and in the formation of laser-induced
periodic surface structures. The initial surface arbitrary roughness is already able, upon laser
exposure, to induce low-spatial-frequency and high-spatial-frequency structures, actively
determining an interference of incoming and scattered fields resulting in spatial energy
modulation. A topology variation with the incoming dose via the number of pulses determines a
correlated evolution in the regular ripple arrangements. The scattering pattern is severely
influenced by the scattering source geometries. Therefore, we equally study experimentally the
role of one-dimensional nanoscale grooves in determining polarization-dependent structuring
patterns at increasing irradiation dose. Finally, the role of surface nanostructures in generating
the surface modulation of deposited energy is analyzed by finite-difference-time-domain
simulation. Ripple formation in multi-pulses is a result of the feedback process between light and
nanostructures.