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Boursey, E.; Meziane, J.; Topouzkhanian, A.

doi:10.1103/physreva.48.3047

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…27. There is continued interest in studying SF for improving theoretical understanding, 28 for detecting species concentrations, 29,30 for determining molecular level structure, 31 and in the context of generating new nonlinear effects. 32 The scaling laws for SF can be quantified in terms of the propagation time E for light through the medium and the dipole coupling time R given by R =1/N⌫.…”

Section: B Superfluorescence Scaling Lawsmentioning

confidence: 99%

Collision-induced superfluorescence

2005

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We have studied superfluorescence (SF) in Ca vapor evolving on the 3d4s 3 D J-4s4p 3 P J−1 transitions at 1.9 m by exciting the 4s 21 S 0-4s4p 1 P 1 with a pulsed dye laser. SF is generated following population transfer by spinchanging collisions with an inert gas Ar from the 4s4p 1 P 1 and 3d4s 1 D 2 levels. We show for the first time to our knowledge that the time delay for SF evolution follows the 1 / ͱ N dependence expected for the case of uniform excitation of the vapor column by collisional transfer. Here, N is the number of participating atoms that was measured directly from the photon yield. The measured photon yield for the signal as a function of Ar pressure was found to be consistent with rate equations that simulate the buildup of populations in the 3 D J levels based on known collisional rates. This suggests that collisional rates can be directly inferred on the basis of SF photon yields and the atomic level populations. The pulse shapes for SF show temporal oscillations that depend on two distinct factors. The first is the presence of a number of independently evolving regions in the gain medium, and the second is the presence of spatial modes. Temporal ringing is a well-known effect related to the exchange of energy between the atoms and the radiation field during pulse propagation. However, the temporal ringing observed in this experiment is far more pronounced than in previous SF experiments due to a particular choice of evolution parameters. This should make it feasible to compare our results with detailed numerical simulations that have been carried out previously.

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Section: B Superfluorescence Scaling Lawsmentioning

confidence: 99%

Collision-induced superfluorescence

2005

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“…impulsive electronic excitation and pulsed lasers) transformed the fluorescence quantum beating technique into a tool for high-precision optical spectroscopy [5,6,10]. In the optical regime, quantum beatsrelated phenomena were observed for the resonant fluorescence of atoms [11,12] and molecules [13][14][15], from an ensemble of two-level atoms [16,17], in quantum well systems [18], and even in the temporal profiles of superfluorescence [19][20][21]. In the XUV regime, quantum beats were used as a tool to evaluate the polarization of synchrotron radiation [22].…”

Section: Introductionmentioning

confidence: 99%

Time-resolved quantum beats in the fluorescence of helium resonantly excited by XUV radiation

LaForge¹,

Benediktovitch²,

Sukharnikov³

et al. 2020

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

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We report on the observation of time-resolved quantum beats in the helium fluorescence from the transition 1s3p → 1s2s, where the initial state is excited by XUV free electron laser radiation. The quantum beats originate from the Zeeman splitting of the magnetic substates due to an external magnetic field. We perform a systematic study of this effect and discuss the possibilities of studying this phenomenon in the XUV and X-ray regime.

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“…Superfluorescence beating [4] is different from the quantum beats [5] since it is a many-atom effect involving interference between the emission of phase-matched optical dipoles belonging to different atoms. The beat frequencies of the superfluorescence may reflect either initial-level splittings, finallevel splittings, or a combination of both [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Superfluorescent transitions in an external magnetic field

Bartholdtsen

Rinkleff

1994

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Polarisation properties of the superfluorescence in the near-infrared regime have been investigated between high-lying levels of Sr and Ba under the influence of a static homogeneous external magnetic field. In some transitions the time-resolved measurements show a change of the polarisation of the superfluorescence depending on the magnetic field strenght. In suitable experimental conditions intensity modulations were observed. These were assigned as Zeeman quantum beats or indirectly observed Zeeman superfluorescent beats. The experimental findings of superfluorescence in two-level, three-level, or multi-level configurations in dependence on the magnetic field strength can be explained well in a semiclassical model of multi-level superfluorescence.

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Superfluorescence beats inTe2125emission

Cited by 12 publications

References 20 publications

Collision-induced superfluorescence

Collision-induced superfluorescence

Time-resolved quantum beats in the fluorescence of helium resonantly excited by XUV radiation

Superfluorescent transitions in an external magnetic field

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