科研之友
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摘要
The electron dynamics and surface ablation of silicate glass excited by single UV femtosecond pulses have been studied by photoluminescence and contact ultrasound diagnostics. At low energy densities of the laser radiation, the photoluminescence signal reveals the linear character of the photogeneration of the electron-hole plasma, accompanied by its radiative recombination, carrier autolocalization, and point-defect generation. At high energy densities, rapid Auger recombination of the dense electron-hole plasma saturates the luminescence output, allowing only ultrasound diagnostics of the photoexcitation and subsequent thermal processes, including spallation and fragmentation ablation. The results of the experimental studies of the electron dynamics are confirmed by the results of its numerical modelling in terms of the quantum kinetic model, based on a solution of the Boltzmann equation. Surface nanolattices are generated on the surface of the glass in the multipulse laser-excitation regime.
- 出版日期2014-5
