Light-induced anisotropy of atomic response: prospects for emission spectrum control

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

doi:10.1140/epjd/e2011-20371-1

Cited by 45 publications

(41 citation statements)

References 57 publications

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“…The polarization of the harmonics, generated in such a specific case of orthogonally polarized o and 2o laser fields in a centrally symmetric gas medium, was not measured so far and was expected to be linear 27 . The break of the temporal translation symmetry of the system (atom þ fields) leading to the generation of elliptically polarized light can, however, be explained by taking into account non-zero projections of the orbital quantum number of the atoms states 28 . In addition, nonlinear processes inside the crystal, for instance a shift of the second harmonic frequency and possible ionization inside the gas medium may further break the symmetry.…”

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confidence: 99%

Towards enabling femtosecond helicity-dependent spectroscopy with high-harmonic sources

et al. 2015

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Recent advances in high-harmonic generation gave rise to soft X-ray pulses with higher intensity, shorter duration and higher photon energy. One of the remaining shortages of this source is its restriction to linear polarization, since the yield of generation of elliptically polarized high harmonics has been low so far. We here show how this limitation is overcome by using a cross-polarized two-colour laser field. With this simple technique, we reach high degrees of ellipticity (up to 75%) with efficiencies similar to classically generated linearly polarized harmonics. To demonstrate these features and to prove the capacity of our source for applications, we measure the X-ray magnetic circular dichroism (XMCD) effect of nickel at the M 2,3 absorption edge around 67 eV. There results open up the way towards femtosecond time-resolved experiments using high harmonics exploiting the powerful element-sensitive XMCD effect and resolving the ultrafast magnetization dynamics of individual components in complex materials.

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confidence: 99%

Towards enabling femtosecond helicity-dependent spectroscopy with high-harmonic sources

et al. 2015

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“…For theoretical studies of the photoemission response of a single atom, we propose a quantum mechanical theory of nonperturbative atomic interac tion between an atom and a laser field [5,7]. Let us give a brief description of this theoretical approach.…”

Section: A Quantum Mechanical Description Of the Hhg Phenomenonmentioning

confidence: 99%

“…To solve this system of equations, we must therefore limit their number. Within the theoretical approach described above, a pq d way of selecting the states that make the main contri bution to the dynamics of atomic evolution was devel oped at a given value of laser pulse intensity [5,7]. In this work, we investigated the interaction between a single silver atom and a laser pulse whose maximum intensity had magnitude W/cm 2 .…”

Section: A Quantum Mechanical Description Of the Hhg Phenomenonmentioning

confidence: 99%

High-order harmonic generation: A quantum-mechanical description and the effects of propagation

Stremoukhov

Андреев

Shoutova

2016

Bull. Russ. Acad. Sci. Phys.

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“…An extensive review of different theoretical approaches has been given in [12]; therefore we confine ourself here to general discussion of the specific problem under consideration. A lot of HHG features can be interpreted with the use of the well-known "three-step model" (or the "simple man model") [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, for symmetry reasons the basis of the "free atom" eigenfunctions is not adequate to this problem. At the same time, the alternative approach to the theory of light-atom interaction based on the use of eigenfunctions of the boundary value problem for "an atom in the external field" has been developed in [12,17]. The basis eigenfunctions of this problem are cylindrically symmetric.…”

Section: Introductionmentioning

confidence: 99%

High-order optical harmonic generation in ionization-free regime: origin of the process

2013

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We present a new interpretation of high-order optical harmonic generation (HHG) in atomic gases interacting with laser fields. The mechanism of harmonic generation is due to the temporal evolution of the atomic electron density spatial distribution in the external laser field, and the integral energy of a high harmonic emission and an electron excitation is equal to the work executed by the laser field for an electron motion in the intra-atomic potential field. The proposed interpretation is based on the use of the basis of eigenfunctions of the boundary value problem for "an atom in the external field." As an illustration, we present the original results of computer simulations of an argon atom interaction with the two-color laser field formed by the fundamental and second harmonics of the Ti:sapphire laser.

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Light-induced anisotropy of atomic response: prospects for emission spectrum control

Cited by 45 publications

References 57 publications

Towards enabling femtosecond helicity-dependent spectroscopy with high-harmonic sources

Towards enabling femtosecond helicity-dependent spectroscopy with high-harmonic sources

High-order harmonic generation: A quantum-mechanical description and the effects of propagation

High-order optical harmonic generation in ionization-free regime: origin of the process

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