The ultra-short pulse laser ablation process has a wide scope in industrial application to produce micro-features with high accuracy. In the present work, experiments have been conducted for multi-pulse ultra-short laser ablation process on 2 mm thick Ti6Al4V alloy plate at high fluence. The ultra-short pulse laser ablated crater morphology is measured using a laser scanning confocal microscope, and the results are confirmed with those obtained using an atomic force microscope, contact-type stylus profiler, and scanning electron microscope. The 2D axisymmetric two-temperature model is solved using a finite element based COMSOL Multiphysics software for a single pulse ablation first. In the present work, the temperature-dependent thermo-physical and optical properties of Ti6Al4V alloy are considered. Since limited data is available, remaining properties are derived from the fundamental physics.


Further, the simulation approach is extended to multi-pulse ultra-short laser ablation. The results of numerical simulation carried out using COMSOL Multiphysics software are compared with the experimental results. The closeness of the results establishes that the proposed simulation approach is robust and can be used to investigate multi-pulse laser ablation process.