Observation of picosecond superfluorescent pulses in rubidium atomic vapor pumped by 100-fs laser pulses

Ariunbold, Gombojav O.; Kash, Michael M.; Sautenkov, Vladimir A.; Li, Hebin; Rostovtsev, Yuri V.; Welch, George R.; Scully, Marlan O.

doi:10.1103/physreva.82.043421

Cited by 48 publications

(12 citation statements)

References 32 publications

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“…Moreover, the long-range nature of the dipole-dipole interaction means that this effect is present even at low densities, where interactions are often neglected. Collective coupling to the radiation field is also responsible for enhanced spontaneous emission or superradiance [28]. We find that the ratio of the strength of the double-quantum coherences to the single-quantum coherences is constant, as the atomic density is varied over an order of magnitude.…”

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confidence: 93%

Two-Dimensional Double-Quantum Spectra Reveal Collective Resonances in an Atomic Vapor

et al. 2012

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We report the observation of double-quantum coherence signals in a gas of potassium atoms at twice the frequency of the one-quantum coherences. Since a single atom does not have a state at the corresponding energy, this observation must be attributed to a collective resonance involving multiple atoms. These resonances are induced by weak interatomic dipole-dipole interactions, which means that the atoms cannot be treated in isolation, even at a low density of 1012 cm−3.

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confidence: 93%

Two-Dimensional Double-Quantum Spectra Reveal Collective Resonances in an Atomic Vapor

et al. 2012

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“…The decay (i.e., emission) occurs on a time scale much shorter than spontaneous decay from the independent individual atoms (or molecules). The picosecond collective emissions from alkali atomic ensemble excited by femtosecond laser pulses have been extensively studied in series of experiments [35][36][37][38][39][40][41] . The present system of pairs of molecules is simplified into three-level system considering only triangular ring mode.…”

Section: Additional Broadening and Ultrafast Collective Emissionsmentioning

confidence: 99%

Ultrafast dephasing in hydrogen-bonded pyridine-water mixtures

Ariunbold

Semon

Nagpal

et al. 2019

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Hydrogen-bonded mixtures with varying concentration are a complicated networked system that demands a detection technique with both time and frequency resolutions. Hydrogen-bonded pyridine-water mixtures are studied by a time-frequency resolved coherent Raman spectroscopic technique. Femtosecond broadband dual-pulse excitation and delayed picosecond probing provide sub-picosecond time resolution in the mixtures temporal evolution. For different pyridine concentrations in water, asymmetric blue versus red shifts (relative to pure pyridine spectral peaks) were observed by simultaneously recording both the coherent anti-Stokes and Stokes Raman spectra. Macroscopic coherence dephasing times for the perturbed pyridine ring modes were observed in ranges of 0.9 -2.6 picoseconds for both 18 and 10 cm −1 broad probe pulses. For high pyridine concentrations in water, an additional spectral broadening (or escalated dephasing) for a triangular ring vibrational mode was observed. This can be understood as a result of ultrafast collective emissions from coherently excited ensemble of pairs of pyridine molecules bound to water molecules.

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“…Later, these effects were detected in cesium atomic beams [2], as well as in ensembles of rubidium atoms [3,4]. The ideas of Dicke were subsequently developed in numerous publications (see for instance [5,6]), which included mostly bi-level systems with different ways of population inversion, possibly leading to superradiance -high intensity pulses, followed by a certain delay in relation to the inverse state formation time.…”

Section: Introductionmentioning

confidence: 99%