Microscopic lensing by a dense, cold atomic sample

Roof, S.J.; Kemp, Kasie; Havey, M. D.; Sokolov, I. M.; Kupriyanov, D. V.

doi:10.1364/ol.40.001137

Cited by 40 publications

(28 citation statements)

References 14 publications

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“…Steady-state experiments also reveal interesting collective effects, such as lensing [17], light diffusion [18,19], changes in the radiation pressure force [20][21][22], etc. Because of potentially important consequences for clock technology [23], the question of collective shifts of the resonance line, in particular, raised a lot of discussions [24][25][26][27][28][29] and experiments [12,[30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Optical-depth scaling of light scattering from a dense and cold atomic Rb87 gas

et al. 2020

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We report investigation of near-resonance light scattering from a cold and dense atomic gas of 87 Rb atoms. Measurements are made for probe frequencies tuned near the F = 2 → F ′ = 3 nearly closed hyperfine transition, with particular attention paid to the dependence of the scattered light intensity on detuning from resonance, the number of atoms in the sample, and atomic sample size. We find that, over a wide range of experimental variables, the optical depth of the atomic sample serves as an effective single scaling parameter which describes well all the experimental data.

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Section: Introductionmentioning

confidence: 99%

Optical-depth scaling of light scattering from a dense and cold atomic Rb87 gas

et al. 2020

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“…on the overlap between atomic cloud and probe beam (see section 2.4). Due to a micro lensing effect of the atomic cloud [25,26], we find that calculating the optical depth for high atomic densities is not straight forward. The details of this investigation are discussed elsewhere [27].…”

Section: Results Inside the Fibermentioning

confidence: 98%

Highly controlled optical transport of cold atoms into a hollow-core fiber

et al. 2018

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We report on an efficient and highly controlled cold atom hollow-core fiber interface, suitable for quantum simulation, information, and sensing. The main focus of this manuscript is a detailed study on transporting cold atoms into the fiber using an optical conveyor belt. We discuss how we can precisely control the spatial, thermal, and temporal distribution of the atoms by, e.g., varying the speed at which the atoms are transported or adjusting the depth of the transport potential according to the atomic position. We characterize the transport of atoms to the fiber tip for these different parameters. In particular, we show that by adapting the transport potential we can lower the temperature of the transported atoms by a factor of 6, while reducing the transport efficiency only by a factor 2. For atoms transported inside the fiber, we can obtain a transport efficiency into the fiber of more than 40% and we study the influence of the different transport parameters on the time-dependent optical depth signal. When comparing our measurements to the results of a classical transport simulation, we find a good qualitative agreement.

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“…However we expect some discrepancies to appear at high densities, where refractive index effects and various collective shifts appear [7,43,[45][46][47][48]. The precise study of these effects is beyond the scope of this paper.…”

Section: A Coupled Dipoles and Random Walkmentioning

confidence: 89%

Comparison of three approaches to light scattering by dilute cold atomic ensembles

Sokolov¹,

Guerin²

2019

J. Opt. Soc. Am. B

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Collective effects in atom-light interaction is of great importance for cold-atom-based quantum devices or fundamental studies on light transport in complex media. Here we discuss and compare three different approaches to light scattering by dilute cold atomic ensembles. The first approach is a coupled-dipole model, valid at low intensity, which includes cooperative effects, like superradiance, and other coherent properties. The second one is a random-walk model, which includes classical multiple scattering and neglects coherence effects. The third approach is a crude approximation only based on the attenuation of the excitation beam inside the medium, the so-called "shadow effect". We show that in the case of a low-density sample, the random walk approach is an excellent approximation for steady-state light scattering, and that the shadow effect surprisingly gives rather accurate results at least up to optical depths on the order of 15.

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Microscopic lensing by a dense, cold atomic sample

Cited by 40 publications

References 14 publications

Optical-depth scaling of light scattering from a dense and cold atomic Rb87 gas

Optical-depth scaling of light scattering from a dense and cold atomic Rb87 gas

Highly controlled optical transport of cold atoms into a hollow-core fiber

Comparison of three approaches to light scattering by dilute cold atomic ensembles

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