Non-Fourier Estimate of Electron Temperature in Case of Femtosecond Laser Pulses Interaction with Metals
by
Anca M. Bucă 1, Mihai Oane 2, Muhammad Arif Mahmood 1,2
, Ion N. Mihăilescu 2, Andrei C. Popescu 2, Bogdan A. Sava 2 and Carmen Ristoscu 2,*
Anca M. Bucă 1, Mihai Oane 2, Muhammad Arif Mahmood 1,2, Ion N. Mihăilescu 2, Andrei C. Popescu 2, Bogdan A. Sava 2 and Carmen Ristoscu 2,*
1
Faculty of Physics, University of Bucharest, Magurele, 077125 Ilfov, Romania
2
National Institute for Laser, Plasma and Radiation Physics (INFLPR), Măgurele, 077125 Ilfov, Romania
*
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 606; https://doi.org/10.3390/met10050606
Received: 13 April 2020 / Revised: 2 May 2020 / Accepted: 6 May 2020 / Published: 8 May 2020
This work is devoted to the electron temperature variation in metals through interaction with femtosecond laser pulses. Our study was inspired by the last mathematical breakthroughs regarding the exact analytical solutions of the heat equation in the case of flash laser-matter interaction. To this purpose, the classical Anisimov’s two temperature model was extended via the 3D telegraph Zhukovsky equation. Based upon this new approach, the computational plots of electron thermal fields during the first laser pulse interaction with a gold surface were inferred. It is shown that relaxation times and coupling factors over electron thermal conductivities (g/K) govern the interaction between the laser pulse and metal sample during the first picoseconds. The lower the factor g/K, the higher the electron temperature becomes. In contrast, the lower the relaxation time, the lower the electron temperature.
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Keywords:
metals; femtosecond lasers-metal interaction; two temperature model; 3D telegraph equation
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MDPI and ACS Style
Bucă, A.M.; Oane, M.; Mahmood, M.A.; Mihăilescu, I.N.; Popescu, A.C.; Sava, B.A.; Ristoscu, C. Non-Fourier Estimate of Electron Temperature in Case of Femtosecond Laser Pulses Interaction with Metals. Metals 2020, 10, 606.
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