&lt;title&gt;Superfluorescence without inversion&lt;/title&gt;

Малышев, В. А.; Рыжов, И. В.; Trifonov, E. D.; Зайцев, А. И.

doi:10.1117/12.287668

Cited by 12 publications

(16 citation statements)

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“…In other words, in contrast to the case of a close Λ-system where the SRWI can be observed [9], the SR in a close V -type system requires the population inversion between actual levels. For the sake of simplicity, let us set…”

Section: Degenerated Doublet (ω 32 = 0)mentioning

confidence: 92%

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Superradiance from an ultrathin film of three-levelV-type atoms: interplay between splitting, quantum coherence and local-field effects

Малышев

Carreño

Antón

et al. 2003

J. Opt. B: Quantum Semiclass. Opt.

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Superradiance from an ultrathin film of three-level V -type atoms: Interplay between splitting, quantum coherence and local-field effects Abstract.We carry out a theoretical study of the collective spontaneous emission (superradiance) from an ultrathin film comprised of three-level atoms with Vconfiguration of the operating transitions. As the thickness of the system is small compared to the emission wavelength inside the film, the local-field correction to the averaged Maxwell field is relevant. We show that the interplay between the lowfrequency quantum coherence within the subspace of the upper doublet states and the local-field correction may drastically affect the branching ratio of the operating transitions. This effect may be used for controlling the emission process by varying the doublet splitting and the amount of low-frequency coherence.

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Section: Degenerated Doublet (ω 32 = 0)mentioning

confidence: 92%

“…Recently, it was shown that in a close system of Λ-type atoms, the low-frequency coherence may give rise to superradiance without inversion (SRWI) [9,10,11,12,13,14]. In reference [15], the SRWI of an open (i.e.…”

Section: Introductionmentioning

confidence: 99%

Superradiance from an ultrathin film of three-levelV-type atoms: interplay between splitting, quantum coherence and local-field effects

Малышев

Carreño

Antón

et al. 2003

J. Opt. B: Quantum Semiclass. Opt.

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“…Previously, we have shown that inversionless super radiance is possible for a thin layer of three level atoms with the scheme of energy levels when the layer thickness is smaller than the wavelengths of the high frequency transitions under conditions of the initial low frequency coherence of the lower state doublet [20,21,23,24]. Such a coherence can be realized using a short high frequency pulse in the channel .…”

Section: Introductionmentioning

confidence: 98%

“…For superradiance in the ensemble of two level atoms, the account for the effects of local field gives rise to a dynamic shift of the resonant fre quency depending on the difference of populations between the levels [1], while, for the ensemble of three level atoms with the scheme of the transi tions, the dynamic frequency shifts induced by the local field give rise to competition of transitions in the high frequency channels and lead to a coherent Raman transition between sublevels of the lower dou blet [10,11]. Specifically, for collective spontaneous emission (superradiance) to be possible in an ensem ble of two level atoms, the initial population inversion in the operating transition is needed [12][13][14][15][16], while, for three level media, there exists a possibility of inver sionless superradiance [17][18][19][20][21][22][23][24], with the initial popu lation of the upper levels being smaller than one half:…”

Section: Introductionmentioning

confidence: 99%

Superradiance of the system comprised of two parallel resonant thin layers

Рыжов¹,

Зайцев²,

Shuval-Sergeeva³

2012

Opt. Spectrosc.

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A cavity like regime of superradiance for a double layer medium populated by atoms with the Λ scheme of transitions is considered in a semiclassical approximation under the condition that the layers are arranged symmetrically with respect to initial characteristics of the field and atomic system populating the layers. An analytical law for the linear stage of the superradiance process is found that agrees well with numer ical solution of the differential equations of the model under consideration for any initial conditions nearly up to the peak of the appropriate characteristic of the field intensity module. For the case of degenerate lower doublet, the resonant character of the dependence of the superradiance pulse time delay on the distance between the layers is studied.

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“…Locally common ones include Graphite Furnace Atomic Absorption Spectroscopy 7 (GFAAS), Inductively Coupled Plasma 8-10 (ICP), Fourier Transform InfRared spectroscopy [11][12][13][14] (FTIR), Laser Induced Breakdown Spectroscopy 15 (LIBS), Cavity Ring Down Spectroscopy 16 (CRDS), Raman Spectroscopy 17 (RAMAN) , Gas Chromatography 18 (GC), X-ray Diffraction [19][20] (XRD), etc. There are many more common systems which have been developed to various degrees including strongly nonlinear approaches [21][22][23][24] . Of particular interest here is LIBS 25-26 . There are many incarnations of LIBS representing several decades of development.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced breakdown plasma-based sensors

Griffin

2010

SPIE Proceedings

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Laser Induced Breakdown Spectroscopy (LIBS) is dependent on the interaction between the initiating Laser sequence, the sampled material and the intermediate plasma states. Pulse shaping and timing have been empirically demonstrated to have significant impact on the signal available for active/passive detection and identification. The transient nature of empirical LIBS work makes data collection for optimization an expensive process. Guidance from effective computer simulation represents an alternative. This computational method for CBRNE sensing applications models the Laser, material and plasma interaction for the purpose of performance prediction and enhancement. This paper emphasizes the aspects of light, plasma, and material interaction relevant to portable sensor development for LIBS. The modeling structure emphasizes energy balances and empirical fit descriptions with limited detailed-balance and finite element approaches where required. Dusty plasma from partially decomposed material sample interaction with pulse dynamics is considered. This heuristic is used to reduce run times and computer loads. Computer simulations and some data for validation are presented. A new University of Memphis HPC/super-computer (~15 TFLOPS) is used to enhance simulation. Results coordinated with related effort at Arkansas State University. Implications for ongoing empirical work are presented with special attention paid to the application of compressive sensing for signal processing, feature extraction, and classification.

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<title>Superfluorescence without inversion</title>

Cited by 12 publications

References 0 publications

Superradiance from an ultrathin film of three-levelV-type atoms: interplay between splitting, quantum coherence and local-field effects

Superradiance from an ultrathin film of three-levelV-type atoms: interplay between splitting, quantum coherence and local-field effects

Superradiance of the system comprised of two parallel resonant thin layers

Laser-induced breakdown plasma-based sensors

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