Ionization of a multilevel atom by ultrashort laser pulses

Andreev, A. V.; Stremoukhov, S. Yu.; Shutova, O. A.

doi:10.1134/s106377611012006x

Cited by 7 publications

(11 citation statements)

References 18 publications

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“…However, the presence of the strong influence on the change in the population of discrete atom levels on its response both in the region of the fields close to atomic ones, and in the region of the fields corresponding to the intensity I ∼ 10 12 W/cm 2 , which seems rather natural, can be also demonstrated within the framework of our theory [33].…”

Section: Introductionmentioning

confidence: 86%

“…Note that illustrations of such behavior of the matrix elements in the range of superatomic-intensity fields were given in our earlier works [33][34][35][36].…”

Section: Common Properties Of the Matrix Elements Of The Operator Vmentioning

confidence: 96%

“…As for the radial dependence, which is determined by Eq. (12), it is also determined analytically for arbitrary states of the discrete and continuous spectra, when one uses the basis of wave eigenfunctions of the hydrogen-like atom (see [33][34][35][36]). Substituting Eq.…”

Section: Connection Between the Eigenfunctions Of The Two Basesmentioning

confidence: 99%

“…(21), we used the relationship E 0 = ωA 0 /c. In the case of a hydrogen atom, the parameter μ 0 is related to the adiabaticity parameter of the Keldysh ionization theory γ = 1/μ 0 [37] (see [33]). …”

Section: Common Properties Of the Matrix Elements Of The Operator Vmentioning

confidence: 99%

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Response of an atom interacting with an arbitrarily polarized electromagnetic field

Андреев

Stremoukhov

Shutova³

2011

Radiophys Quantum El

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We develop the theory of interaction of the electromagnetic field and a single atom being in an arbitrary state and having an arbitrary direction of the angular momentum of the atomic electron with respect to the direction of the field polarization vector. It is shown that the atom response current has a tensor structure and depends on both the direction of the angular momentum of the atom, and the polarization vector of the external field. The tensor character of the response is determined by the externally induced anisotropic distribution of the probability density of spatial localization of the atomic electron. It is shown that the induced-anisotropy effects clarify the harmonic generation mechanism at play during the non-resonance interaction of laser radiation with atomic media. The developed theory is applied to the analysis of the problem about the generation of terahertz waves in a two-color laser field. It is shown that the change in the mutual orientation of wave polarization vectors leads to a significant increase in the efficiency of conversion of high-frequency fields to low-frequency ones. It is shown for the first time that the generation of terahertz waves is possible in the preionization regime, when the generation mechanism is related to atomic nonlinearity.

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Section: Introductionmentioning

confidence: 86%

“…Note that illustrations of such behavior of the matrix elements in the range of superatomic-intensity fields were given in our earlier works [33][34][35][36].…”

Section: Common Properties Of the Matrix Elements Of The Operator Vmentioning

confidence: 96%

Section: Connection Between the Eigenfunctions Of The Two Basesmentioning

confidence: 99%

Section: Common Properties Of the Matrix Elements Of The Operator Vmentioning

confidence: 99%

See 2 more Smart Citations

Response of an atom interacting with an arbitrarily polarized electromagnetic field

Андреев

Stremoukhov

Shutova³

2011

Radiophys Quantum El

Self Cite

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“…It has been shown in [9][10][11][12] that wave eigenfunc tions of the boundary value problem of an atom in a field have the form (2) Let us turn to the analysis of the structure of wave functions (2). We use the well known formula…”

Section: Boundary Value Problem For the Atom In An External Fieldmentioning

confidence: 99%

Control for atom response in multicomponent laser fields

2012

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A theory of the nonlinear optical response of an atom interacting with a superposition of arbi trarily polarized fields is developed. The theory is based on the analytical solution of the boundary value problem for an electron moving in a spherically symmetric intraatomic field and in the field of an external electromagnetic field. By means of the example of an argon atom interacting with a bichromatic field formed by the first and second harmonics of a Ti:sapphire laser, it is shown that, when an atom interacts with the field of two polarized pulses the polarization directions of which are not collinear, the response spectrum signifi cantly depends on the laser radiation parameters-the duration and intensity of pulses, the time of delay between them, and the angle between the directions of polarization vectors. Generation of THz radiation is shown to be possible in the ionization free regime due to intraatomic nonlinearity.

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Spectrum of high harmonics generated by two-color circularly polarized laser field in atomic media

2020

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Here we discuss the new effects in the light-atom interaction of an atom and two-colour (ω, 2ω) elliptically polarized femtosecond pump beams. We show that the spectrum of atomic response does not include the signal at summary frequency (ω + 2ω) and its harmonics when the frequency components of the pumping field are counter-rotating and the atom is in s-ground state. In the case when the ground state of the atom is p-state (l = 1), these components vanish in the response spectrum of the longitudinal atomic current. In both cases, the suppression of the summary frequency is accompanied by the suppression of signal at THz frequency.

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Ionization of a multilevel atom by ultrashort laser pulses

Cited by 7 publications

References 18 publications

Response of an atom interacting with an arbitrarily polarized electromagnetic field

Response of an atom interacting with an arbitrarily polarized electromagnetic field

Control for atom response in multicomponent laser fields

Spectrum of high harmonics generated by two-color circularly polarized laser field in atomic media

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