Electromagnetically induced absorption in a bichromatic laser field

Zhukov, A. A.; Zibrov, S. A.; Romanov, G.; Dudin, Y. O.; Vassiliev, V. V.; Velichansky, V. L.; Yakovlev, Valeriy P.

doi:10.1103/physreva.80.033830

Cited by 21 publications

(13 citation statements)

References 22 publications

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“…3. The EIA formation mechanism is unique to the K hyperfine structure, thus leading to an enhanced efficiency of accumulation in the bright state, superior or comparable to those obtained with more complex schemes and experimental setups, in thermal vapors [15,21]. …”

Section: Figmentioning

confidence: 95%

“…In our work, by taking advantage of the overlapping of the K ground state hyperfine components and of the optical transitions of its D 1 line, we obtain the same efficiency of accumulation in states forming bright or dark resonances, depending on the experimental conditions, which can be easily tuned, as demonstrated in the following. These results represent a relevant advance in the EIA performances and relevant simplification of the setup (see, for example, [15,21]). Also, thanks to the possibility of using counter-propagating beams, new experimental protocols and arrangements can be thus envisaged, as well as new possible applications in optics and photonics.…”

mentioning

confidence: 99%

“…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.…”

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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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Section: Figmentioning

confidence: 95%

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

et al. 2017

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“…In this case, one often refers to the phenomenon as a nonlinear magneto-optical resonance, which can be bright or dark, as the absorption at zero magnetic field represents a local maximum or minimum, respectively. Recently, attention has been focused on the conversion of EIT to EIA as a function of the properties of the pump field, such as polarization [4] and laser power density [5][6][7][8]. In this work we describe the conversion of a bright nonlinear magnetooptical resonance to a dark resonance as a function of the laser power density of the single optical field and the temperature.…”

Section: Introductionmentioning

confidence: 99%

Conversion of bright magneto-optical resonances into dark resonances at fixed laser frequency forD2excitation of atomic rubidium

et al. 2012

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Nonlinear magneto-optical resonances on the hyperfine transitions belonging to the D2 line of rubidium were changed from bright to dark resonances by changing the laser power density of the single exciting laser field or by changing the vapor temperature in the cell. In one set of experiments atoms were excited by linearly polarized light from an extended cavity diode laser with polarization vector perpendicular to the light's propagation direction and magnetic field, and laser induced fluorescence (LIF) was observed along the direction of the magnetic field, which was scanned. A low-contrast bright resonance was observed at low laser power densities when the laser was tuned to the Fg = 2 −→ Fe = 3 transition of 87 Rb and near to the Fg = 3 −→ Fe = 4 transition of 85 Rb. The bright resonance became dark as the laser power density was increased above 0.6mW/cm 2 or 0.8 mW/cm 2 , respectively. When the Fg = 2 −→ Fe = 3 transition of 87 Rb was excited with circularly polarized light in a second set of experiments, a bright resonance was observed, which became dark when the temperature was increased to around 50 o C. The experimental observations at room temperature could be reproduced with good agreement by calculations based on a theoretical model, although the theoretical model was not able to describe measurements at elevated temperatures, where reabsorption was thought to play a decisive role. The model was derived from the optical Bloch equations and included all nearby hyperfine components, averaging over the Doppler profile, mixing of magnetic sublevels in the external magnetic field, and a treatment of the coherence properties of the exciting radiation field.

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“…The main reason that seriously limits the area of EIA use, consists in the problem of obtaining a high-contrast and at the same time sufficiently narrow nonlinear resonance. Indeed, there are a lot of papers demonstrating a relatively good contrast of the EIA signals, but this is at the expense of large widths (for instance, see [28][29][30][31][32][33]). And, vice versa, the width can be as small as 10 kHz down to just several hundreds of Hz, but, unfortunately, these signals have an extremely low contrast (~ 1 %) [34][35][36].…”

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High-quality electromagnetically-induced absorption resonances in a buffer-gas-filled vapour cell

et al. 2018

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A new configuration for observation of magneto-optical subnatural-linewidth resonances of electromagnetically induced absorption (EIA) in alkali vapor has been verified experimentally. The configuration includes using two counter-propagating pump and probe light waves with mutually orthogonal linear polarizations, exciting an open optical transition of an alkali atom in the presence of a buffer gas. The main advantage of the novel observation scheme consists in the possibility of obtaining simultaneously high-contrast and quite narrow nonlinear signals. Here a 2.5-cm long rubidium-87 vapor cell filled with Ar buffer gas is used, and the excited optical transition is the Fg=2→Fe=1 of the D1 line. The signals registered reach a contrast of 57.7% with a FWHM of 7.2 mG. The contrast with respect to a wide Doppler pedestal well exceeds 100%. To our knowledge, to date this is the best result for EIA resonances in terms of contrast-to-width ratio. In general, the results demonstrate that the new magneto-optical scheme has very good prospects for various applications in quantum metrology, nonlinear optics and photonics.

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Electromagnetically induced absorption in a bichromatic laser field

Cited by 21 publications

References 22 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

Conversion of bright magneto-optical resonances into dark resonances at fixed laser frequency forD2excitation of atomic rubidium

High-quality electromagnetically-induced absorption resonances in a buffer-gas-filled vapour cell

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