Electromagnetically induced absorption in a nondegenerate three-level ladder system

Whiting, Daniel; Bimbard, Erwan; Keaveney, James; Zentile, Mark A.; Adams, Charles S.; Hughes, Ifan G.

doi:10.1364/ol.40.004289

Cited by 43 publications

(31 citation statements)

References 28 publications

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“…Highcontrast EIA has been observed on the 87 Rb D 2 line by using a complex excitation scheme with three separate photonic fields [21], and was theoretically investigated in [22]. EIA was also observed in the Paschen-Back regime in a purely non-degenerate three-level ladder system in 87 Rb [23]. Furthermore, while Rb and Cs have been widely investigated, this is the first observation of EIA in K, confirming our preliminary results [24].…”

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confidence: 82%

Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

et al. 2017

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We demonstrate high-contrast Electromagnetically Induced Absorption (EIA) bright resonances on the D 1 line of 39 K with characteristics comparable to those of the Electromagnetically Induced Transparency (EIT) dark resonances observed in the same conditions. EIA is produced by the interaction of a weak probe beam with the atomic ground state driven in a degenerate coherent superposition by either a co-or counterpropagating pump beam. We have obtained an order of magnitude increase of the EIA's contrast with respect to previous similar experiments, performed with other alkalis, without compromising its linewidth. Furthermore, we show that the magneto-optic resonances can be continuously tuned from EIT to EIA by changing the relative handedness of circular polarizations of pump and probe beams, or depending on whether they co-or counter-propagate. This opens new perspectives in the use of EIA in a broad range of physical domains and in a large wealth of potential applications in optics and photonics. Contrary to Coherent Population Trapping and Electromagnetically Induced Transparency (EIT) with their ultra-narrow linewidths [1][2][3][4][5][6][7][8], Electromagnetically Induced Absorption (EIA) has found limited applications, mainly due to its broader linewidth and significantly smaller contrast. Nonetheless, an increasing interest in EIA was recently generated in view of potential applications, such as enhancement of the group velocity of light [9] and photonic metamaterials [10].EIA linewidths of several tens of kiloHertz have been reported, either with bichromatic excitation of Zeeman sublevels[11] or in Hanle configuration [12][13][14]. Bi-chromatic Hanle configuration has been explored by using Rb D 1 and D 2 lines [15]. Low-contrast EIA, resulting from EIT on D 2 line, was reported. Higher contrast EIA has been observed in [16], although overlapped to large background, which could be detrimental for highly-selective applications. More recently, sub-kHz EIA resonances were observed in Rb [17] and Cs [18,19]. In both cases, however, the contrast was of only a few percents. A pump/probe scheme in Hanle configuration for high-contrast EIA was proposed in a buffered vapor cell [20]. To date, however, no experimental demonstration has been reported. Highcontrast EIA has been observed on the 87 Rb D 2 line by using a complex excitation scheme with three separate photonic fields [21], and was theoretically investigated in [22]. EIA was also observed in the Paschen-Back regime in a purely non-degenerate three-level ladder system in 87 Rb [23]. Furthermore, while Rb and Cs have been widely investigated, this is the first observation of EIA in K, confirming our preliminary results [24].In this Letter, we report on an alternative and simpler approach for large contrast EIA in Hanle configuration using a pump/probe excitation scheme. We have observed EIA resonance contrast exceeding 50% in thermal K vapor. In this case, hyperfine optical pumping, which accumulates atoms to levels non interacting with the light [25,26], ...

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confidence: 82%

Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

et al. 2017

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“…The comparison with theory thus relies on modeling their inhomogeneous density distribution accurately. Second, an effective two-level system can be created in the widely used alkali atoms by imposing a strong magnetic field which could separate the different transitions by several times the natural linewidth as demonstrated in some recent experiments on three-level systems [50,51]. This method could be in principle applied on our setup to create an effective two-level system and could help to understand the aforementioned discrepancies.…”

Section: Discussionmentioning

confidence: 91%

Transmission of near-resonant light through a dense slab of cold atoms

et al. 2017

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The optical properties of randomly positioned, resonant scatterers is a fundamentally difficult problem to address across a wide range of densities and geometries. We investigate it experimentally using a dense cloud of rubidium atoms probed with near-resonant light. The atoms are confined in a slab geometry with a sub-wavelength thickness. We probe the optical response of the cloud as its density and hence the strength of the light-induced dipole-dipole interactions are increased. We also describe a theoretical study based on a coupled dipole simulation which is further complemented by a perturbative approach. This model reproduces qualitatively the experimental observation of a saturation of the optical depth, a broadening of the transition and a blue shift of the resonance

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“…For 87 Rb in the HPB regime, due to the large Zeeman splitting, the atomic transitions are all separated by more than the width of the Doppler broadened lines. For some applications with thermal vapours, this greatly simplifies the physics, since true 2-, 3-, and 4-level systems can be easily isolated, allowing for archetypal demonstrations of selective reflection [50], electromagnetically induced transparency [51], electromagnetically induced absorption [52], and four-wave-mixing processes [53,54].…”

Section: Stokes Polarimetry In the Voigt Geometrymentioning

confidence: 99%

ElecSus: Extension to arbitrary geometry magneto-optics

Keaveney

Adams

Hughes

2018

Computer Physics Communications

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We present a major update to ElecSus, a computer program and underlying model to calculate the electric susceptibility of an alkali-metal atomic vapour. Knowledge of the electric susceptibility of a medium is essential to predict its absorptive and dispersive properties. In this version we implement several changes which significantly extend the range of applications of ElecSus, the most important of which is support for non-axial magnetic fields (i.e. fields which are not aligned with the light propagation axis). Suporting this change requires a much more general approach to light propagation in the system, which we have now implemented. We exemplify many of these new applications by comparing ElecSus to experimental data. In addition, we have developed a graphical user interface front-end which makes the program much more accessible, and have improved on several other minor areas of the program structure.

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Electromagnetically induced absorption in a nondegenerate three-level ladder system

Cited by 43 publications

References 28 publications

Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

Transmission of near-resonant light through a dense slab of cold atoms

ElecSus: Extension to arbitrary geometry magneto-optics

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