EXPERIMENTAL AND THEORETICAL-STUDIES OF BUMP FORMATION DURING LASER TEXTURING OF NI-P DISK SUBSTRATES

We provide here extended experimental data on the bump shape formed on Ni-P disk substrate under various laser and substrate surface conditi ons, and describe a model for the Sombrero-shape bump formation based on competition between thermocapillary and chemicapillary flows. This model rationalizes a large body of experimental data and provides insi ght into how one might tailor bump shapes to specific requirements. Fo r comparison, laser hump formation on non-Ni-P substrates has also bee n studied.