Microscopic characterization of Lévy flights of light in atomic vapors

Mercadier, Nicolas; Chevrollier, Martine; Guerin, William; Kaiser, Robin

doi:10.1103/physreva.87.063837

Cited by 19 publications

(22 citation statements)

References 21 publications

(33 reference statements)

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“…4). This is necessary to calculate the next spectra [22] but does not reflect the spectrum measured in our experiment. In order to simulate the single-scattering spectrum as measured in the experiment at low optical thickness, we include the angle dependence by considering the energy conservation of a photon scattered at θ = 5.6 • from the incident laser propagation direction (see black curve in Fig.…”

Section: B Contrast Of the Temporal Correlationmentioning

confidence: 99%

Temporal intensity correlation of light scattered by a hot atomic vapor

et al. 2016

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We present temporal intensity correlation measurements of light scattered by a hot atomic vapor. Clear evidence of photon bunching is shown at very short time-scales (nanoseconds) imposed by the Doppler broadening of the hot vapor. Moreover, we demonstrate that relevant information about the scattering process, such as the ratio of single to multiple scattering, can be deduced from the measured intensity correlation function. These measurements confirm the interest of temporal intensity correlation to access non-trivial spectral features, with potential applications in astrophysics.

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Section: B Contrast Of the Temporal Correlationmentioning

confidence: 99%

Temporal intensity correlation of light scattered by a hot atomic vapor

et al. 2016

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“…On the other hand, the role of Lévy flight for light in the conventional frames of radiative transfer in spectral lines is identified, e.g., in Ref. [20].…”

Section: Introductionmentioning

confidence: 99%

Automodel solutions for Lévy flight-based transport on a uniform background

Kukushkin

Sdvizhenskii

2016

J. Phys. A: Math. Theor.

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A wide class of non-stationary superdiffusive transport on a uniform background with a powerlaw decay, at large distances, of the step-length probability distribution function (PDF) is shown to possess an automodel solution. The solution for Green function is constructed using the scaling laws for the propagation front (relevant-to-superdiffusion average displacement) and asymptotic solutions far beyond and far in advance of the propagation front. These scaling laws are determined essentially by the long-free-path carriers (Lévy flights). The validity of the suggested automodel solution is proved by its comparison with numerical solutions in the one-dimensional (1D) case of the transport equation with a simple long-tailed PDF with various power-law exponents and in the 3D case of the Biberman-Holstein equation of the resonance radiation transfer for various (Doppler, Lorentz, Voight and Holtsmark) spectral line shapes.

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“…To do so, one may, for instance, prepare an incident radiation with a Voigt-like profile, which was achieved in Ref. [26] by submitting laser photons to a few frequency-redistributing scattering events in an auxiliary vapor cell prior to sending them to the measurement cell [27].…”

Section: Introductionmentioning

confidence: 99%

Redistribution of light frequency by multiple scattering in a resonant atomic vapor

et al. 2015

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The propagation of light in a resonant atomic vapor can a priori be thought of as a multiple scattering process, in which each scattering event redistributes both the direction and the frequency of the photons. Particularly, the frequency redistribution may result in Lévy flights of photons, directly affecting the transport properties of light in a resonant atomic vapor and turning this propagation into a superdifusion process. Here, we report on a Monte-Carlo simulation developed to study the evolution of the spectrum of the light in a resonant thermal vapor. We observe the gradual change of the spectrum and its convergence towards a regime of Complete Frequency Redistribution as the number of scattering events increases. We also analyse the probability density function of the step length of photons between emissions and reabsorptions in the vapor, which governs the statistics of the light diffusion. We observe two different regime in the light transport: superdiffusive when the vapor is excited near the line center and normal diffusion for excitation far from the line center. The regime of Complete Frequency Redistribution is not reached for excitation far from resonance even after many absorption/reemission cycles due to correlations between emitted and absorbed frequencies.

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Microscopic characterization of Lévy flights of light in atomic vapors

Cited by 19 publications

References 21 publications

Temporal intensity correlation of light scattered by a hot atomic vapor

Temporal intensity correlation of light scattered by a hot atomic vapor

Automodel solutions for Lévy flight-based transport on a uniform background

Redistribution of light frequency by multiple scattering in a resonant atomic vapor

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