Effect of the polarization of counterpropagating light waves on nonlinear resonances of the electromagnetically induced transparency and absorption in the Hanle configuration

Brazhnikov, D. V.; Тайченачев, А. В.; Tumaĭkin, A. M.; Yudin, V. I.; Ryabtsev, I. I.; Энтин, В. М.

doi:10.1134/s0021364010120039

Cited by 33 publications

(23 citation statements)

References 15 publications

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“…The dip can be observed (dashed black line) when dark states NC 1 ñ | and NC 2 ñ | are close to each other (case of parallel polarizations, see figures 2(a) and 9(d). Note that a similar effect under a pump-probe regime was discussed in references [35,38]. Figure 19(b) reflects the influence of the openness of the Λ-scheme.…”

Section: Zeeman Cpt Statessupporting

confidence: 66%

High-contrast sub-Doppler absorption spikes in a hot atomic vapor cell exposed to a dual-frequency laser field

et al. 2017

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The saturated absorption technique is an elegant method widely used in atomic and molecular physics for high-resolution spectroscopy, laser frequency standards and metrology purposes. We have recently discovered that a saturated absorption scheme with a dual-frequency laser can lead to a significant sign reversal of the usual Doppler-free dip, yielding a deep enhanced-absorption spike. In this paper, we report detailed experimental investigations of this phenomenon, together with a full indepth theoretical description. It is shown that several physical effects can support or oppose the formation of the high-contrast central spike in the absorption profile. The physical conditions for which all these effects act constructively and result in very bright Doppler-free resonances are revealed. Apart from their theoretical interest, results obtained in this manuscript are of great interest for laser spectroscopy and laser frequency stabilization purposes, with applications in laser cooling, matterwave sensors, atomic clocks or quantum optics. the atomic resonant frequency, the two counter-propagating waves drive different atom groups (of respective axial velocities v + and v -) due to the Doppler shift, which yields the Doppler profile. By contrast, when the frequency detuning is being scanned near the resonance frequency, the two waves act on the same group of atoms with v 0 » . Each wave reduces the absorption experienced by the other. Consequently, one can observe a Doppler-free dip in the absorption profile of one wave or a reduction in total fluorescence of the cell. This dip, with Lorentzian profile and natural linewidth, is known as the Lamb dip, or as saturated absorption resonance (SAR). It can be several orders of magnitude narrower than the Doppler-broadened spectrum in which it sits. A simple two-level scheme (with non-degenerate energy levels) can also exhibit SAR as a single peak or with a more complex shape such as those induced by the recoil effect [17][18][19], high-order spatial harmonics of atomic polarization [20] or peculiarities of the Doppler effect for open atomic transitions [21]. Multilevel atoms can exhibit a complex energy-level structure involving fine and hyperfine splittings and Zeeman (magnetic) sublevels. This complex structure yields complex optical pumping processes, justifying for example the detection of cross-over resonances in saturated absorption spectra or, under appropriate conditions, a sign reversal of saturation resonances [22][23][24][25][26][27].In a recent paper [28], an unexpected deep and narrow reversed spike (strong absorption peak) was observed in a saturated absorption experiment using a dual-frequency laser. The experiment was performed on a Cs vapor cell. The laser carrier frequency was tuned on the Cs D 1 line, with a frequency difference between the two firstorder sidebands equal to the hyperfine splitting (HFS) of the ground state. This phenomenon was applied to improve by about one order of magnitude the fractional frequency stability of a diode laser compared...

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Section: Zeeman Cpt Statessupporting

confidence: 66%

High-contrast sub-Doppler absorption spikes in a hot atomic vapor cell exposed to a dual-frequency laser field

et al. 2017

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“…We should note that the analysis and effects presented in this subsection have many in common with those discussed in [46][47][48] for the hf-CPT effect and in [49,50] for the Zeeman-CPT effect.…”

Section: The Operator ˆˆêmentioning

confidence: 79%

Dual-frequency sub-Doppler spectroscopy: Extended theoretical model and microcell-based experiments

et al. 2019

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Doppler-free spectroscopy using two counter-propagating dual-frequency laser beams in alkali vapor cells has been demonstrated recently, providing the detection of high-contrast sign-reversed natural-linewidth sub-Doppler resonances. However, to date, only a qualitative theory based on a simplified Λ-scheme model has been reported to explain underlying physics of this phenomenon. In this work, we develop a general and extended theoretical model of dual-frequency sub-Doppler spectroscopy (DF SDS) for Cs D 1 line. The latter considers the real atomic energy structure, main relaxation processes and various nonlinear effects including optical pumping, optical transition saturation, Zeeman and hyperfine coherent population trapping (CPT) states. This model allows to describe quantitatively the respective contributions of involved physical processes and consequently to estimate main properties (height and linewidth) of detected sub-Doppler resonances. Experimental results performed with a Cs vapor micro-fabricated cell are reported and explained by theoretical predictions. Spatial oscillations of the sub-Doppler resonance amplitude with translation of the reflection mirror are highlighted. Reported results show that DF SDS could be a promising approach for the development of a fully-miniaturized and high-performance optical frequency reference, with applications in various compact quantum devices.

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“…(4). The Rabi frequency squared is proportional to the exciting radiation's power density with some proportionality coefficient k Rabi ,…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Other groups have also studied the influence of coupling laser power on EIT and EIA in different systems and for different polarizations of the coherent fields [6][7][8]22]. Brazhnikov et al have studied the effect of the polarization of counterpropagating fields on EIT and EIA [4]. Even a small change in the ellipticity of one of the fields can change EIT to EIA.…”

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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Effect of the polarization of counterpropagating light waves on nonlinear resonances of the electromagnetically induced transparency and absorption in the Hanle configuration

Cited by 33 publications

References 15 publications

High-contrast sub-Doppler absorption spikes in a hot atomic vapor cell exposed to a dual-frequency laser field

High-contrast sub-Doppler absorption spikes in a hot atomic vapor cell exposed to a dual-frequency laser field

Dual-frequency sub-Doppler spectroscopy: Extended theoretical model and microcell-based experiments

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

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