Journal
MATERIALS TRANSACTIONS
Volume 51, Issue 6, Pages 1156-1162Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.M2010009
Keywords
nonequilibrium energy transfer; pulse train lasers; ablation; ultrashort pulse laser; thin films
Funding
- Ministry of Knowledge and Economy (MKE) of the Korean government
- National Research Foundation of Korea through Multi-phenomena CFD Engineering Research Center [2009-0083510]
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The objective of this study is to numerically investigate the electron-phonon interactions and the nonequilibrium energy transfer in metal thin films irradiated by ultrashort pulse train lasers In particular. the temporal and spatial variations in the optical properties during laser irradiation are discussed, the influence of the number of pulses per train and the pulse separation time are also examined The present study uses the well-established two-temperature model to describe laser-solid interactions and the quantum approach to determine various properties such as electron heat capacity, electron thermal conductivity. collision frequencies. reflectivity, and absorption rates It is found that as the number of pulses per pulse tram increases, the nonequilibrium state between electrons and phonons gradually disappears because of the energy relaxation and the low electron thermal conductivity The results show that the electron-electron and electron-phonon collision frequencies vary significantly with the number of pulses per tram and the separation time per pulse, and that they considerably affect the reflectivity and absorption rate, in turn leading to a change in the ablation mechanism of in metal films for pulse train laser heating [doi 10.2320/matertrans.M2010009]
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