Topic
Femtosecond
About: Femtosecond is a research topic. Over the lifetime, 35106 publications have been published within this topic receiving 691405 citations. The topic is also known as: 1 E-15 s & fs.
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TL;DR: Numerical simulations reveal that the electron beam is formed due to the confinement of the surface quasistatic electromagnetic fields, of interest for potential applications of fast electron beams and deep understanding of the cone-target physics in the fast ignition related experiments.
Abstract: A novel fast electron beam emitting along the surface of a target irradiated by intense laser pulses is observed. The beam is found to appear only when the plasma density scale length is small. Numerical simulations reveal that the electron beam is formed due to the confinement of the surface quasistatic electromagnetic fields. The results are of interest for potential applications of fast electron beams and deep understanding of the cone-target physics in the fast ignition related experiments.
156 citations
TL;DR: In this article, the optical, structural, and nonlinear optical properties of silver nanoparticles prepared by laser ablation in various liquids were investigated at 397.5, 532, and 795 nm.
156 citations
TL;DR: In this article, the dependence of the intensity of a focused Ti:Sapphire laser pulse in air on the propagation distance was studied by measuring the photo-emission spectrum of N 2 and N 2 +.
155 citations
TL;DR: In this paper, the authors present the first femtosecond time-resolved study of the evolution of the laser-excited carrier density with the laser intensity, in various dielectrics of practical interest (SiO2, Al2O3, MgO) both above and below the breakdown threshold.
Abstract: We present the first femtosecond time-resolved study of the evolution of the laser-excited carrier density with the laser intensity, in various dielectrics of practical interest (SiO2, Al2O3, MgO) both above and below the breakdown threshold. These measurements demonstrate that the high electronic excitation responsible for optical breakdown in these solids is produced by multiphoton absorption by valence electrons, for pulses shorter than a few ps. No sign of electronic avalanche has been observed for such short pulses.
155 citations
TL;DR: The photoisomerization of retinal in rhodopsin is modeled by a vibronically coupled electronic two-state system, taking into account a collective reaction coordinate and the ethylenic stretch mode as discussed by the authors.
Abstract: The photoisomerization of retinal in rhodopsin is modeled by a vibronically coupled electronic two-state system, taking into account a collective reaction coordinate and the ethylenic stretch mode. The model qualitatively reproduces all available spectroscopic information on rhodopsin and accounts for its high reaction efficiency. Quantum simulations of femtosecond time-resolved experiments suggest that the prominent 60 cm-1 oscillations observed in experiments are due to nonadiabatic wave packet motion along the reaction coordinate. This indicates that the protein is capable of providing an almost friction-free environment for retinal up to ≈2 ps, thereby catalyzing the photoreaction.
155 citations