Ultrafast heating and thermomechanical coupling induced by femstosecond lasers
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This work focuses on the ultrafast thermomechanical waves generated by the hot electrons excited by ultrafast, ultra-intense lasers. The dominating effects during the short-time transient, including ultrafast thermalization and relaxation between electrons and phonons, result in thermomechanical coupling that cannot be described by Fourier’s law alone. The various thermomechanical properties are grouped to characterize the ultrafast heating and deformation. A finite-difference differential formulation is used as a general tool to tackle the new set of coupled equations that are formulated to describe the severe impingement of a hot-electron blast in the presence of nonequilibrium heating, rapid expansion/contraction of the metal lattices, phonon relaxation, and thermomechanical coupling.
KeywordsHot-electron blast Relaxation Thermalization Thermomechanical coupling Volumetric expansion rate
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