Perpustakaan Digital ITB

This thesis focuses on the numerical modelling of the multiple physics involved in ultrashort laser interaction with a metal. The understanding of this interaction plays crucial role in various industries, namely in biomedicine, nanotechnology manufacturing, and materials processing. The Finite-Difference Time-Domain method along with the Drude model is utilized to solve the Maxwell’s equations that governs the laser propagation as it interacts with the metal. The comparison between FDTD and analytically calculated source term is discussed. The Two-Temperature Model is solved with the Lattice Boltzmann Method to calculate the ultrafast energy transfer between electron-lattice heat carriers. The LB method shows good accuracy compared to literature. Moreover, free surface hydrodynamics extended with multiphase tracking is solved with LB to model the melt flow. Finally, the modelling of material ejection due to ablation is attempted. This work highlights the potential development of TTM-LBM as an alternative for ultrashort ablation simulations.