Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Modern Optics

Excitation of atomic coherence at XUV transition enhanced by tunneling in an electric field for X-ray generation

Yuri V. Rostovtsev

Published Oct 20, 2009• 2 citations
Publisher

Abstract

We study population transfer in a two-level system interacting with a strong off-resonant electromagnetic field. We show that the effects of tunneling in an electric field enhances the probability of excitation. We discuss the possible applications of results obtained to the generation of XUV radiation.
DOI
10.1080/09500340903365993

Related papers

Excitation of atomic coherence at XUV transition by using a far-off resonant two-frequency driving field

Yuri V. Rostovtsev

We study population transfer in a three-level system interacting with a strong off-resonant electromagnetic field consisting of radiation with two optical frequencies. We show that the presence of the second frequency broadens multi-photon resonances and even for higher than 3-photon resonances the probability of excitation weakly depends on optical frequency. We discuss possible applications of results obtained for generation of XUV radiation.

Journal of Modern Optics•Nov 10, 2008•6 citations

Atomic and nuclear coherence excited by optical pulses: CEP effects and generation of X-ray and nuclear radiation

Yuri V. Rostovtsev

We study population transfer and excitation of quantum coherence in atomic and nuclear systems interacting with strong ultra-short laser pulses. We discuss CEP effects and possible applications to cooperative generation of XUV and nuclear radiation.

Frontiers in Optics•Jan 1, 2010•0 citations

Using quantum coherence to generate gain in the XUV and X-ray: gain-swept superradiance and lasing without inversion

Eyob Alebachew Sete, Anatoly A. Svidzinsky, Yuri V. Rostovtsev +4 more

It was shown some time ago that when the excitation of an ensemble of two-level atoms is swept in the direction of lasing, so that atoms are prepared in the excited state just as the radiation from previously excited atoms reaches them, the resulting laser amplifier is “highly anomalous” and yields superradiant emission without population inversion. We here show that transient gain in a three-level system has common features with Dicke superradiance and can yield strong extreme ultraviolet lasing in, for example, He atoms (at 58 nm) or He-like ions such asB3+(at 6.1 nm).

IEEE Journal of Selected Topics in Quantum Electronics•Oct 14, 2011•48 citations

Application of multiple-scale perturbation theory to atomic systems interacting with high and low frequency electromagnetic fields

Elena Kuznetsova, Reed Nessler, Olga A. Kocharovskaya +1 more

Abstract The interaction of three and two-level atomic systems with two electromagnetic fields, a weak near resonant high-frequency and a strong off-resonant low-frequency ones, is analyzed by applying the method of multiple-scale perturbation theory. We consider two examples: (1) a three-level Λ system interacting with a weak XUV field at the high-energy transition and a strong IR field at the adjacent low-energy transition. The IR field will periodically Stark modulate the energy of the most excited state, which will result in generation of sidebands of the XUV field at the frequencies multiple of the IR field modulation frequency; (2) a two-level atom interacting with a weak near-resonant high-frequency and an off-resonant low-frequency field, which is related to the quantum amplification by superradiant emission of radiation problem.

Physica Scripta•May 1, 2019•0 citations

Excitation of atomic coherence using off-resonant strong laser pulses

Yuri V. Rostovtsev, Hichem Eleuch, Anatoly A. Svidzinsky +3 more

We study dynamics of a two-level system driven by a strong off-resonant electromagnetic field. We derive an analytical solution for arbitrary pulse shape. We discuss possible applications and presented experimental demonstration of the results obtained.

Physical Review A•Jun 24, 2009•48 citations

Attosecond pulse formation via switching of resonant interaction by tunnel ionization

T. R. Akhmedzhanov, V. A. Antonov, Yevgeny V. Radeonychev +1 more

We investigate a new method to produce attosecond pulses from a resonant XUV radiation in an atomic gas which is simultaneously irradiated by an IR laser field. Around the crests of an IR field all the excited atomic energy levels are strongly broadened due to rapid tunnel ionization from the corresponding excited states and atoms are not able to resonantly absorb the incident vacuum ultraviolet radiation. Vice versa, around zeroes of an IR field, ionization is slow and atoms effectively absorb the vacuum ultraviolet radiation. As a result, an interaction between atoms and XUV field is switched on and off resulting in formation of attosecond pulses.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Sep 22, 2015•1 citation
It was shown some time ago that when the excitation of an ensemble of two-level atoms is swept in the direction of lasing, so that atoms are prepared in the excited state just as the radiation from previously excited atoms reaches them, the resulting laser amplifier is “highly anomalous” and yields superradiant emission without population inversion. We here show that transient gain in a three-level system has common features with Dicke superradiance and can yield strong extreme ultraviolet lasing in, for example, He atoms (at 58 nm) or He-like ions such asB3+(at 6.1 nm).
Abstract The interaction of three and two-level atomic systems with two electromagnetic fields, a weak near resonant high-frequency and a strong off-resonant low-frequency ones, is analyzed by applying the method of multiple-scale perturbation theory. We consider two examples: (1) a three-level Λ system interacting with a weak XUV field at the high-energy transition and a strong IR field at the adjacent low-energy transition. The IR field will periodically Stark modulate the energy of the most excited state, which will result in generation of sidebands of the XUV field at the frequencies multiple of the IR field modulation frequency; (2) a two-level atom interacting with a weak near-resonant high-frequency and an off-resonant low-frequency field, which is related to the quantum amplification by superradiant emission of radiation problem.
We investigate a new method to produce attosecond pulses from a resonant XUV radiation in an atomic gas which is simultaneously irradiated by an IR laser field. Around the crests of an IR field all the excited atomic energy levels are strongly broadened due to rapid tunnel ionization from the corresponding excited states and atoms are not able to resonantly absorb the incident vacuum ultraviolet radiation. Vice versa, around zeroes of an IR field, ionization is slow and atoms effectively absorb the vacuum ultraviolet radiation. As a result, an interaction between atoms and XUV field is switched on and off resulting in formation of attosecond pulses.