Nonlinear optical response of an atom in the field of femtosecond laser pulses with near-atomic intensity

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

doi:10.1134/s0021364011080030

Cited by 11 publications

(11 citation statements)

References 26 publications

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“…The maximal order of experimentally observed harmonic is equal to 71. On the other hand, the results of computer simulations performed for the single silver atom [14] have shown that the CF is saturated in the region of over atomic field strength, but at near atomic field strength the maximal order of generated harmonics is much higher than that observed experimentally. The main purpose of the presented study is to explain the difference between the experimental and theoretical results and to provide the interpretation of the main mechanisms lying in the origin of the CF saturation effect.…”

Section: Studies Of Hhg Cut-off In Silver Irradiated By Femtosecond Pmentioning

confidence: 79%

“…One can see from Figure 5(a) that the calculated laser pulse intensity I calc  10 14 W·cm −2 at which the CF is saturated is close to the experimentally measured value (I exp = 4 × 10 14 W·cm…”

Section: −2mentioning

confidence: 84%

“…In experiments with 155 fs pulse of Ti:sapphire laser the highest experimentally measured harmonic was 61 and the saturation intensity of I exp = 4 × 10 14 W·cm −2 . The theoretical analysis is based on the non-perturbative theory of nonlinear response, which enables to vary the laser field strength in a wide region from a subatomic to a over-atomic values.…”

Section: −2mentioning

confidence: 99%

“…The position of laser focus was adjusted to be either before or after the laser plume to exclude the influence of considerable ionization of the silver neutrals and ions in laser plume and to maximize the harmonic yield. The intensity of the driving femtosecond pulse (I fp ) at the plasma area was adjusted between 1×10 14 and 1×10 15 W·cm…”

Section: I mentioning

confidence: 99%

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New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Ganeev¹

2013

OPJ

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Recent studies of plasma harmonic generation are reviewed. We show the advances of this technique for generation of coherent ultrashort pulses in the extreme ultraviolet range. Among the achievements highlighted in this review are the comparative experimental and theoretical studies of high-order harmonic generation in silver plasma, isolated subfemtosecond pulse generation in Mn plasma ablation, stable generation of high-order harmonics of femtosecond laser radiation from laser produced plasma plumes at 1 kHz pulse repetition rate, and high-order harmonic generation in fullerenes using few-and multi-cycle pulses of different wavelengths. We show that new developments of plasma harmonic studies can lead to the creation of an attractive field of laser ablation induced high-order harmonic generation spectroscopy.

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Section: Studies Of Hhg Cut-off In Silver Irradiated By Femtosecond Pmentioning

confidence: 79%

Section: −2mentioning

confidence: 84%

Section: −2mentioning

confidence: 99%

Section: I mentioning

confidence: 99%

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New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Ganeev¹

2013

OPJ

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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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Enhancement of Efficiency of XUV Generation in Atomic Gases Irradiated by Intense Laser Fields

Andreev

Stremoukhov

Shoutova

2014

Springer Proceedings in Physics

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We discuss the effects of particle correlations on the spectral broadening due to the radiator motion (Doppler broadening) for a Ni-like XUV laser line pumped in two different regimes (transient and quasi-steady state regimes) of collisional excitation. In a medium with gain, radiative transport effects modify the observed profile and these modifications depend on the homogeneous or inhomogeneous nature of the intrinsic profile (before amplification). The intrinsic line profile is usually described by a Voigt profile, which is the convolution of a Lorentzian profile due to the different homogeneous broadenings (electron collision-induced transitions and spontaneous emission) and an inhomogeneous Gaussian profile due to Doppler shifts (due to the radiator motion in the free-particle limit). In this paper, it is shown that accounting for the correlations between particles modifies noticeably the radiator-motion broadened profiles, whatever the densities and temperatures values.

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Nonlinear optical response of an atom in the field of femtosecond laser pulses with near-atomic intensity

Cited by 11 publications

References 26 publications

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Control for atom response in multicomponent laser fields

Enhancement of Efficiency of XUV Generation in Atomic Gases Irradiated by Intense Laser Fields

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