Showing papers on "Ponderomotive energy published in 2000"
TL;DR: In this article, the authors present the landmarks of the 30-odd-year evolution of ultrashort-pulse laser physics and technology culminating in the generation of intense few-cycle light pulses and discuss the impact of these pulses on high-field physics.
Abstract: The rise time of intense radiation determines the maximum field strength atoms can be exposed to before their polarizability dramatically drops due to the detachment of an outer electron. Recent progress in ultrafast optics has allowed the generation of ultraintense light pulses comprising merely a few field oscillation cycles. The arising intensity gradient allows electrons to survive in their bound atomic state up to external field strengths many times higher than the binding Coulomb field and gives rise to ionization rates comparable to the light frequency, resulting in a significant extension of the frontiers of nonlinear optics and (nonrelativistic) high-field physics. Implications include the generation of coherent harmonic radiation up to kiloelectronvolt photon energies and control of the atomic dipole moment on a subfemtosecond $(1{\mathrm{f}\mathrm{s}=10}^{\mathrm{\ensuremath{-}}15}\mathrm{}\mathrm{s})$ time scale. This review presents the landmarks of the 30-odd-year evolution of ultrashort-pulse laser physics and technology culminating in the generation of intense few-cycle light pulses and discusses the impact of these pulses on high-field physics. Particular emphasis is placed on high-order harmonic emission and single subfemtosecond extreme ultraviolet/x-ray pulse generation. These as well as other strong-field processes are governed directly by the electric-field evolution, and hence their full control requires access to the (absolute) phase of the light carrier. We shall discuss routes to its determination and control, which will, for the first time, allow access to the electromagnetic fields in light waves and control of high-field interactions with never-before-achieved precision.
2,547 citations
TL;DR: Application of the Born-Oppenheimer approximation shows that atoms in any Rydberg state can be trapped, with readily achievable experimental parameters, and this scheme would extend the benefits of atom trapping to highly excited atoms.
Abstract: We propose to use the ponderomotive energy of Rydberg electrons in standing-wave light fields to form an optical lattice for Rydberg atoms. Application of the Born-Oppenheimer approximation shows that, with readily achievable experimental parameters, atoms in any Rydberg state can be trapped. Realization of this scheme would extend the benefits of atom trapping to highly excited atoms.
80 citations
TL;DR: In this article, the internal energy distribution of the excited toluene cations created by a multiple-order multiphoton ionization model is calculated. But the model does not take into account successive channel closing for increasing peak intensities and orders up to 11.
Abstract: is found to be effectively proportional to the sixth power of the peak intensity. This is shown to be in good agreement with a multiple lowest-order perturbation multiphoton ionization model which takes into account successive channel closing for increasing peak intensities and orders up to 11 inclusive. On the assumption that the excess energy acquired by the toluene cation as a result of the interaction with the electromagnetic field is of the order of the ponderomotive energy for the intensity prevailing at the moment of the ionization, the internal energy distribution of the toluene cations created that is brought about by this multiple-order multiphoton ionization model is calculated. This internal energy distribution is in perfect agreement with the measured C 7H 7 yield, if the rate-energy curve for the fragmentation of excited toluene cations as given by Golovin et al. @Sov. J. Chem. Phys. 2, 632 ~1985!# is moderately reduced by a factor of 4.5. © 2000 American Institute of Physics. @S0021-9606~00!00121-5#
29 citations
TL;DR: In this paper, the authors find out the physical conditions that give rise to the narrow peaks in the electron energy spectra when the photoelectrons absorb from the low frequency field an amount of energy almost equal to the ponderomotive energy.
Abstract: Recently an excitation scheme has been proposed for observing interference effects caused by simultaneous action of a two-colour low-frequency field with commensurate frequencies during the photodetachment of a negative ion. In this letter, we find out the physical conditions that give rise to the narrow peaks in the electron energy spectra when the photoelectrons absorb from the low frequency field an amount of energy almost equal to the ponderomotive energy. We use this information to determine the ponderomotive threshold shift of photodetachment in a highly nonlinear regime.
1 citations
01 Jan 2000
TL;DR: In this paper, the dynamic Stark effect in Rydberg NO A2∑+ induced by ultrafast laser pulses is quantitatively determined at different laser intensities: dynamic Stark shifts of 0.36 eV are reported and assessed in relation to the electron ponderomotive energy.
Abstract: The dynamic Stark effect in Rydberg NO A2∑+ induced by ultrafast laser pulses is quantitatively determined at different laser intensities: dynamic Stark shifts of 0.36 eV are reported and assessed in relation to the electron ponderomotive energy.
1 citations
TL;DR: In this paper, the fifth harmonic pulses of an intense femtosecond Ti:sapphire laser were experimentally shown to be negatively chirped by using an LiF plate as a positive dispersive medium.
Abstract: The fifth harmonic pulses of an intense femtosecond Ti:sapphire laser were experimentally shown to be negatively chirped by using an LiF plate as a positive dispersive medium The chirp of the harmonic pulse originates from the intensity-dependent atomic dipole phase, which is estimated to be proportional to 25 Up, where Up is the ponderomotive energy Consequently, we have succeeded in compressing the chirped pulses to 13 fs by compensating the intrinsic negative chirp Chirp effects of the fundamental laser on the pulse width of the fifth harmonic were consistent with the negative chirp of the fifth harmonic