Effect of the dynamic reflectivity on laser energy absorption by zinc: Numerical two-temperature modeling

0522400 - FZÚ 2020 RIV CZ eng J - Journal Article
Lizunov, Sergei - Zhukov, Vladimir - Bulgakov, Alexander - Bulgakova, Nadezhda M.
Effect of the dynamic reflectivity on laser energy absorption by zinc: Numerical two-temperature modeling.
MM Science Journal. Roč. 2019, Dec. (2019), s. 3567-3572. ISSN 1803-1269
R&D Projects: GA MŠMT EF15_003/0000445; GA MŠMT EF15_006/0000674
EU Projects: European Commission(XE) 739573 - HiLASE CoE
Grant - others:OP VVV - BIATRI(XE) CZ.02.1.01/0.0/0.0/15_003/0000445; OP VVV - HiLASE-CoE(XE) CZ.02.1.01/0.0/0.0/15_006/0000674
Institutional support: RVO:68378271
Keywords : ultrafast laser * zinc * dynamic reflectivity * electron heat conductivity * numerical modeling * two-temperature model * finite difference method
OECD category: Optics (including laser optics and quantum optics)
Method of publishing: Open access

The optical response of metal surfaces to high-power laser excitation (HPLE) is one of important topics of laser-matter interaction, which remains to be poorly understood. It is known that certain metals, which are well reflective at normal conditions, become considerably absorbing during irradiation by ultrashort high-power lasers. Reflectivity of such metals during the irradiation stage is a key parameter of the HPLE process as it determines the absorbed laser energy and, hence, the post-irradiation evolution of the material. In this paper, we present a two-temperature model of femtosecond laser irradiation of zinc, which takes into account the dynamic change of surface reflectivity due to excitation of the conduction electrons. The model involves integration of the reflected part of the laser beam over the irradiation spot to enable comparisons with experimental data. The numerical scheme which combines the description of the reflectivity change with the TTM is discussed in detail.
Permanent Link: http://hdl.handle.net/11104/0306900