A Numerical Study of the Dynamics of Gold Heating by Ultra-Short Dichromatic Laser Pulses
https://doi.org/10.25205/2541-9447-2021-16-1-5-20
Abstract
The interaction of femtosecond laser pulses of moderate intensity with metals by the example of gold is studied. The main attention is paid to dichromatic regimes of laser irradiation corresponding to a new trend in the field of laser processing of materials. Based on the two-temperature approximation, a new model is created which involves a dichromatic source of the laser radiation energy and also takes into account the influence of the electron temperature on the reflection coefficient of the irradiated material and thermophysical properties of its electronic subsystem. For numerical implementation of the model, an implicit divergent finite-difference scheme is created with an improved method for describing the melting process in comparison with previous works. The model calculations have shown that the absorption of the laser energy by gold depends on the sequence of two pulses at different wavelengths and the delay time between them, and for correct description of the absorbed energy, it is necessary to take into account the change of the reflection coefficient of the surface during irradiation. The developed model may be of interest for optimizing the processing of materials with ultra-short dichromatic laser pulses.
Keywords
laser processing of metals,
ultra-short laser pulses,
dichromatic radiation,
optical properties,
numerical simulation
Supporting agencies: The work was carried out within the framework of the state contract with IT SB RAS and with the support of the RFBR (project no. 19-38-90203)
About the Authors
S. A. Lizunov
S. S. Kutateladze Institute of Thermophysics SB RAS
Russian Federation
Russian Federation
Sergey A. Lizunov, PhD student
Novosibirsk
V. P. Zhukov
Federal Research Center for Information and Computational Technologies; Novosibirsk State Technical University
Russian Federation
Russian Federation
Vladimir P. Zhukov, Doctor of Sciences in Physics and Mathematics, Senior Scientist
Novosibirsk
A. V. Bulgakov
S. S. Kutateladze Institute of Thermophysics SB RAS
Russian Federation
Russian Federation
Alexander V. Bulgakov, Doctor of Sciences in Physics and Mathematics, Principal Scientist
Novosibirsk
N. M. Bulgakova
S. S. Kutateladze Institute of Thermophysics SB RAS
Russian Federation
Russian Federation
Nadezhda M. Bulgakova, Doctor of Sciences in Physics and Mathematics, Principal Scientist
Novosibirsk
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Review
For citations:
Lizunov S.A., Zhukov V.P., Bulgakov A.V., Bulgakova N.M. A Numerical Study of the Dynamics of Gold Heating by Ultra-Short Dichromatic Laser Pulses. SIBERIAN JOURNAL OF PHYSICS. 2021;16(1):5-20. (In Russ.) https://doi.org/10.25205/2541-9447-2021-16-1-5-20
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