Scattering and Reaction Processes in Powerful Laser Fields

Milošević, D. B.; Ehlotzky, F.

doi:10.1016/s1049-250x(03)80007-1

Cited by 191 publications

(87 citation statements)

References 519 publications

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“…The topics to be considered have been covered by many more general review papers [34][35][36][37][38][39][40][41]. Some historical remarks can be found in [39].…”

mentioning

confidence: 99%

The plateau in above-threshold ionization: the keystone of rescattering physics

Becker

Goreslavski

Milošević

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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A review is presented of the rescattering plateau in laser-induced above-threshold ionization and its various features as they were discovered over time. Several theoretical explanations are discussed, from simple momentum conservation to the quantum-mechanical improved strongfield approximation and the inherent quantum orbits or, alternatively, entirely classical methods. Applications of the plateau to the extraction of atomic or molecular potentials and to the characterization of the driving laser pulse are also surveyed.

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“…The topics to be considered have been covered by many more general review papers [34][35][36][37][38][39][40][41]. Some historical remarks can be found in [39].…”

mentioning

confidence: 99%

The plateau in above-threshold ionization: the keystone of rescattering physics

Becker

Goreslavski

Milošević

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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“…(31)- (33)] for the Coulomb factor in the probability amplitude for nonlinear ionization by a lowfrequency intense laser field for the case in which the Keldysh parameter γ is small. We have also presented detailed applications of our general formulas to the important special cases of LP and CP laser fields.…”

Section: Discussionmentioning

confidence: 99%

“…These methods include the numerical solution of the time-dependent Schrödinger equation (TDSE); exactly solvable models such as the quasistationary quasienergy states approach (QQES) for the zero-range potential [28]; the adiabatic approximation [29][30][31]; the S-matrix approach [32][33][34][35]; the Keldysh theory [18,36,37] or, equivalently, the strong field approximation [38,39]; and the simple man (classical) model (SMM) [40]. Although exact, the TDSE approach presents two difficulties: it is highly demanding of computational resources, particularly for fields having long wavelengths or polarizations other than linear, and it provides little insight into the physics of a problem without extensive, time-consuming additional calculations to explore the relevant parameter space.…”

Section: Overview Of Theoretical Methods For Strong Field Processesmentioning

confidence: 99%

Adiabatic-limit Coulomb factors for photoelectron and high-order-harmonic spectra

et al. 2017

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A momentum-dependent Coulomb factor in the probability for nonlinear ionization of atoms by a strong low-frequency laser field is calculated analytically in the adiabatic approximation. Expressions for this Coulomb factor, valid for an arbitrary laser pulse waveform, are obtained and analyzed in detail for the cases of linear and circular polarizations. The dependence of the Coulomb factor on the photoelectron momentum is shown to be significant in both cases. Using a similar technique, the Coulomb factor for emission of high-order harmonics by an atom in a bichromatic laser field is also calculated. In contrast to the case of a single-frequency field, for bichromatic fields the Coulomb factor depends significantly on the harmonic energy.

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“…The price one has to pay, however, is that the HHG cutoff decreases in accordance with the classical law ω cut−off = I p + 3.17U p , where both U p and saturation intensity I sat must necessarily be smaller. One way to circumvent this obstacle and to even enhance the cutoff is to consider HHG originating from a superposition of an excited and a ground state [40,41] or excited vibrational states in molecules [42] -for the more recent developments of these ideas see [43][44][45]. Another, easier way is to scale the intensity and the laser wavelength (frequency) in accordance with I p .…”

Section: W/cmmentioning

confidence: 99%

High-order-harmonic generation from Rydberg atoms driven by plasmon-enhanced laser fields

et al. 2016

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We theoretically investigate high-order harmonic generation (HHG) in Rydberg atoms driven by spatially inhomogeneous laser fields, induced, for instance, by plasmonic enhancement. It is well known that the laser intensity should to exceed certain threshold in order to generate HHG, when noble gas atoms in their ground state are used as an active medium. One way to enhance the coherent light coming from a conventional laser oscillator is to take advantage of the amplification obtained by the so-called surface plasmon polaritons, created when a low intensity laser field is focused onto a metallic nanostructure. The main limitation of this scheme is the low damage threshold of the materials employed in the nanostructures engineering. In this work we propose to use Rydberg atoms, driven by spatially inhomogeneous, plasmonic-enhanced laser fields, for HHG. We exhaustively discuss the behaviour and efficiency of these systems in the generation of coherent harmonic emission. To this aim we numerically solve the time-dependent Schrödinger equation for an atom with an electron initially in a highly excited n-th Rydberg state, located in the vicinity of a metallic nanostructure, where the electric field changes spatially on the scales relevant for the dynamics of the laser-ionized electron. We first use a one-dimensional model to investigate the phenomena systematically. We then employ a more realistic situation, when the interaction of a plasmonic-enhanced laser field with a three-dimensional Hydrogen atom is modelled. We discuss the scaling of the relevant input parameters with the principal quantum number n of the Rydberg state in question, and demonstrate that harmonic emission could be achieved from Rydberg atoms well below the damage threshold, thus without deteriorating the geometry and properties of the metallic nanostructure.

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Scattering and Reaction Processes in Powerful Laser Fields

Cited by 191 publications

References 519 publications

The plateau in above-threshold ionization: the keystone of rescattering physics

The plateau in above-threshold ionization: the keystone of rescattering physics

Adiabatic-limit Coulomb factors for photoelectron and high-order-harmonic spectra

High-order-harmonic generation from Rydberg atoms driven by plasmon-enhanced laser fields

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