Steady-state signatures of radiation trapping by cold multilevel atoms

Baudouin, Quentin; Mercadier, Nicolas; Kaiser, Robin

doi:10.1103/physreva.87.013412

Cited by 5 publications

(6 citation statements)

References 36 publications

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“…After some time of illumination, a sudden switch-off of the exciting laser leads to a slow decrease of the fluorescence due to multiple scattering. This 'imprisonment of radiation' [30], or 'radiation trapping' [31], has been studied in cold atoms [32,79], taking also into account subtle effects like the frequency redistribution induced by the Doppler shift [80,81] or the multilevel structure [82]. Neglecting those effects, one can easily find the scaling of the radiation trapping time with the optical depth.…”

Section: A Coherent and Diffuse Transmissionmentioning

confidence: 99%

Light interacting with atomic ensembles: collective, cooperative and mesoscopic effects

Guerin

Rouabah

Kaiser

2016

Journal of Modern Optics

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120

117

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International audienceCooperative scattering has been the subject of intense research in the last years. In this article, we discuss the concept of cooperative scattering from a broad perspective. We briefly review the various collective effects that occur when light interacts with an ensemble of atoms. We show that some effects that have been recently discussed in the context of 'single-photon superradiance', or cooperative scattering in the linear-optics regime, can also be explained by 'standard optics', i.e., using macroscopic quantities such as the susceptibility or the diffusion coefficient. We explain why some collective effects depend on the atomic density, and others on the optical depth. In particular, we show that, for a large and dilute atomic sample driven by a far-detuned laser, the decay of the fluorescence, which exhibits superradiant and subradiant dynamics, depends only on the on-resonance optical depth. We also discuss the link between concepts that are independently studied in the quantum-optics community and in the mesoscopic-physics community. We show that the coupled-dipole model predicts a departure from Ohm's law for the diffuse light, that incoherent multiple scattering can induce a saturation of fluorescence and we also show the similarity between the weak-localization correction to the diffusion coefficient and the inaccuracy of Lorentz local field correction to the susceptibility

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Section: A Coherent and Diffuse Transmissionmentioning

confidence: 99%

Light interacting with atomic ensembles: collective, cooperative and mesoscopic effects

Guerin

Rouabah

Kaiser

2016

Journal of Modern Optics

Self Cite

120

117

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“…In contrast to typical EIT experiments, where a pump laser frequency is kept fixed as a probe laser frequency is scanned across the two-photon resonance condition, in our experiment, the probe laser is self-generated and stays close to the two-photon resonance. Using a lower pump intensity than in 28 we have observed features unexplained by our rate equation model (Fig. 4), which might be explained by self-induced EIT, but a more precise analysis also taking into account diffuse forward and backward scattering is required.…”

Section: Radiation Trapping With Multilevel Atomsmentioning

confidence: 90%

“…In recent experiments, we have extended our study of radiation trapping in a collection of cold atoms to open transitions, including four atomic levels (two ground states and two excited states), excited by two separate lasers. 28 In this configuration, each transition is driven by one laser and can be considered as a two-level subsystem. The two subsystems are then coupled to each other via spontaneous emission and by the trapped radiation.…”

Section: Radiation Trapping With Multilevel Atomsmentioning

confidence: 99%

Cold and Hot Atomic Vapors: A Testbed for Astrophysics?

Baudouin

Guerin

Kaiser

2014

Annual Review of Cold Atoms and Molecules

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Atomic physics experiments, based on hot vapors or laser-cooled atomic samples, may be useful to simulate some astrophysical problems, where radiation pressure, radiative transport or light amplification are involved. We discuss several experiments and proposals, dealing with multiplescattering of light in hot and cold atomic vapors, random lasing in cold atoms and light-induced long-range forces, which may be relevant in this context.

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“…As detailed in ref. 26, population redistribution is then responsible for the increase of fluorescence. This effect is negligible for the detunings considered here, and only gain can explain the observed features.…”

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confidence: 99%

A cold-atom random laser

et al. 2013

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Conventional lasers make use of optical cavities to provide feedback to gain media. Conversely, mirrorless lasers can be built by using disordered structures to induce multiple scattering, which increases the effective path length in the gain medium and thus provides the necessary feedback. These so-called random lasers potentially offer a new and simple mean to address applications such as lighting. To date, they are all based on condensed-matter media. Interestingly, light or microwave amplification by stimulated emission occurs also naturally in stellar gases and planetary atmospheres. The possibility of additional scattering-induced feedback (that is, random lasing) has been discussed and could explain unusual properties of some space masers. Here, we report the experimental observation of random lasing in a controlled, cold atomic vapour, taking advantage of Raman gain. By tuning the gain frequency in the vicinity of a scattering resonance, we observe an enhancement of the light emission of the cloud due to random lasing. The unique possibility to both control the experimental parameters and to model the microscopic response of our system provides an ideal test bench for better understanding natural lasing sources, in particular the role of resonant scattering feedback in astrophysical lasers

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Steady-state signatures of radiation trapping by cold multilevel atoms

Cited by 5 publications

References 36 publications

Light interacting with atomic ensembles: collective, cooperative and mesoscopic effects

Light interacting with atomic ensembles: collective, cooperative and mesoscopic effects

Cold and Hot Atomic Vapors: A Testbed for Astrophysics?

A cold-atom random laser

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