Thermal Lattice Field during Ultra-Short Laser Pulse Irradiation of Metal Targets: A Fokker-Planck Analytical Model
METALS(2023)
Abstract
The ultrafast fs laser pulse heating of thin metal films is studied for the first time using the two-temperature model on the basis of the Fokker-Planck formalism. The incident laser radiation is multi-modal, while the electron temperature is described during the first 2 fs. The predictions are intended for use by experimentalists in optoelectronics, photonics, laser processing, electronics, and bio- and nanomedicine. The crucial role of the nano-sized spatial dimensions of the metal sample is highlighted. A significant result of this study is the interdependence between the target's size, the phonon/lattice characteristics, and the coefficient beta (the quotient of non-diffusive phenomena), which varies between zero (pure diffusive case) and one (pure non-diffusive case).
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Key words
two-temperature model,Fokker-Planck analytical approach,laser heating of metals,fs laser pulses,analytical simulations,beta parameter
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