Melting of gold by ultrashort laser pulses: advanced two-temperature modeling and comparison with surface damage experiments

0558814 - FZÚ 2023 RIV DE eng J - Journal Article
Lizunov, Sergei - Bulgakov, Alexander - Campbell, E.E.B. - Bulgakova, Nadezhda M.
Melting of gold by ultrashort laser pulses: advanced two-temperature modeling and comparison with surface damage experiments.
Applied Physics A - Materials Science & Processing. Roč. 128, č. 7 (2022), č. článku 602. ISSN 0947-8396. E-ISSN 1432-0630
R&D Projects: GA MŠMT EF15_003/0000445
Grant - others:OP VVV - BIATRI(XE) CZ.02.1.01/0.0/0.0/15_003/0000445
Institutional support: RVO:68378271
Keywords : ultrashort laser pulses * gold * damage threshold * two-temperature model * electron-lattice coupling rate * ballistic electrons * optical response
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1007/s00339-022-05733-4

The ultrafast-laser-induced solid–liquid phase transition in metals is still not clearly understood and its accurate quantitative description remains a challenge.Here,we systematically investigated,both experimentally and theoretically,the melting of gold by single femto-and picosecond near-infrared laser pulses.Two laser systems with wavelengths of 800 and 1030 nm and pulse durations ranging from 124 fs to 7 ps were used, and the damage and ablation thresholds were determined for each irradiation condition. The theoretical analysis was based on two-temperature modeling.Different expressions for the electron–lattice coupling rate and contribution of ballistic electrons were examined.In addition,the number of free electrons involved in the optical response is suggested to be dependent on the laser intensity and the influence of the fraction of involved electrons on the damage threshold was investigated.

Permanent Link: https://hdl.handle.net/11104/0333621