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: By propagating femtosecond pulses inside submicron-crosssection Si photonic-wire waveguides with anomalous dispersion, it is demonstrated that the pulse-propagation dynamics is strongly influenced by the combined action of optical nonlinearity and up to third-order dispersion with minimal carrier effects.
Abstract: By propagating femtosecond pulses inside submicron-cross-section Si photonic-wire waveguides with anomalous dispersion, we demonstrate that the pulse-propagation dynamics is strongly influenced by the combined action of optical nonlinearity and up to third-order dispersion with minimal carrier effects. Because of strong light confinement, a nonlinear phase shift of a few π due to self-phase modulation is observed at a pulse peak-power of just ~250 mW. We also observe soliton-emitted radiation, fully supported by theoretical analysis, from which we determine directly the third-order dispersion coefficient, β3=-0.73±0.05 ps3/m at 1537 nm.
137 citations
TL;DR: The intense, brief pulses of X-rays from upcoming free-electron lasers will greatly extend X-ray microscopy to the femtosecond time domain and to interatomic length scales.
Abstract: The intense, brief pulses of X-rays from upcoming free-electron lasers will greatly extend X-ray microscopy to the femtosecond time domain and to interatomic length scales. From recent experiments and simulations one can envisage imaging macromolecules with X-rays without the need for crystallization.
137 citations
TL;DR: In this paper, the carrier envelope phase effects of femtosecond laser pulses were investigated for electron rescattering at sharp metal tips, and the authors presented detailed theory models that support this interpretation.
Abstract: Nanometre-scale metal tips irradiated by femtosecond laser pulses represent ultrafast electron sources. The combination of the laser pulse and the tip offers the possibility of extending attosecond science from atomic or molecular gases to surfaces of solid nanoemitters. We first review this emerging research field focusing on electron rescattering at sharp metal tips. In particular, we investigate the carrier?envelope phase effects that reveal attosecond emission dynamics. Furthermore, we present detailed theory models that support this interpretation.
137 citations
TL;DR: In this article, the femtosecond pump-and-probe spectroscopy was used to detect photo-induced differential reflection in the picosecond time domain and the measured period increases linearly with size over a wide range and extracted sound velocities are consistent with those of bulk.
Abstract: Nonthermal generation of coherent-acoustic phonons is observed in metallic nanoparticles of tin and gallium, which are solid and liquid, respectively, at room temperature, by applying femtosecond pump-and-probe spectroscopy. Oscillations in the photo-induced differential reflection are clearly detected in the picosecond time domain. The measured period increases approximately linearly with size over a wide range and extracted sound velocities are consistent with those of bulk. Transition to ballistic regime in carrier excitation is also discussed on the basis of the disappearance of oscillations for particle sizes below hot-carrier mean free paths.
136 citations
TL;DR: In this paper, femtosecond pulse-shaping techniques were used to control several useful parameters of coherent anti-Stokes Raman spectroscopy (CARS) spectra.
Abstract: Using femtosecond pulse-shaping techniques, we are able to control several useful parameters of coherent anti-Stokes Raman spectroscopy (CARS). By shaping both the pump and the Stokes pulses with an appropriate spectral phase function, we eliminated the nonresonant CARS background. In addition, we designed pulses which selectively excite one of two neighboring Raman levels, even when both are well within the excitation spectrum. High-resolution CARS spectra were recorded in spite of the broad femtosecond pulse spectrum.
136 citations