Abstract

Heating of conduction-band electrons is one of the major processes of energy absorption and transfer in high-intensity ultrafast laser–solid interactions. It is frequently simulated by assuming a high rate of electron-particle collisions. We explore the approximation of low-rate electron–phonon collisions based on the Vinogradov equation for the intraband absorption rate by conduction-band electrons performing laser-driven oscillations. Band-structure modification by the ponderomotive energy of the ultrafast oscillations is taken into account. The Vinogradov equation combined with the Keldysh formula for the interband transition rate delivers a highly nonequilibrium energy distribution of the conduction electrons. Reported results suggest a substantial revision of the traditional models of ultrafast free-carrier heating by intense laser pulses.

© 2018 Optical Society of America

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Supplementary Material (2)

NameDescription
» Visualization 1       Time evolution of energy distribution of conduction-band electrons in crystalline ZnSe generated by interband transitions from light-hole (blue), heavy-hole (red), and split-off (green) valence bands. Produced using the Vinogradov equation (Eq. (12)).
» Visualization 2       Time evolution of energy distribution of conduction-band electrons in crystalline ZnSe generated by interband transitions from light-hole (blue), heavy-hole (red), and split-off (green) valence bands. Produced using the Drude equation (Eq. (11)).

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Equations (25)

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