Modeling the melting threshold of Mo films upon ultrashort laser irradiation

0538961 - FZÚ 2021 RIV CZ eng J - Journal Article
Hlinomaz, Kryštof - Levy, Yoann - Derrien, Thibault - Bulgakova, Nadezhda M.
Modeling the melting threshold of Mo films upon ultrashort laser irradiation.
MM Science Journal. Roč. 2019, Dec (2019), s. 3585-3593. ISSN 1803-1269
R&D Projects: GA MŠMT LO1602; GA MŠMT LM2015086
Institutional support: RVO:68378271
Keywords : energy conservation * two-temperature model * melting threshold * thin film * ultrashort laser pulses
OECD category: Optics (including laser optics and quantum optics)
Method of publishing: Open access

Modification of thin metallic films using ultrashort laser pulses involves interplay of numerous physical processes. Finding a right combination of laser parameters is essential for achieving the desired modification of a thin film deposited on a substrate. Numerical modeling is a convenient tool for gaining insights into ultrafast evolution of material properties and to predict an optimal range of irradiation parameters. In this work, a mathematical model is presented that describes the ultrafast laser heating and temperature relaxation in a thin molybdenum film deposited on a glass substrate. The laser energy absorption by molybdenum is described using a two-temperature model. The model takes into account the heat exchange between the film and the substrate through a boundary condition applied on the lattice temperature. The implicit numerical scheme employed for simulations was verified in respect of energy conservation.
Permanent Link: http://hdl.handle.net/11104/0316697