Angular dependence of an electromagnetically induced transparency resonance in a Doppler-broadened atomic vapor

Carvalho, P. R. S.; Araujo, Luı́s E. E. de; Tabosa, J. W. R.

doi:10.1103/physreva.70.063818

Cited by 39 publications

(28 citation statements)

References 28 publications

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“…The number of atoms participating in writing the absorption grating would be greatly increased by using a cold atomic sample, and the residual Doppler effect would also be reduced. Larger reflection separation angle () values might be achievable with a shorter interaction region, larger laser beam diameters and higher atomic density, but a larger value of would also broaden both the reflection signals and the EIT transmission [18] and reduce the effectiveness of EIT and EIG. Furthermore, it has been predicted that the transmission behaviour for the EIG will be extremely different for !…”

Section: Discussionmentioning

confidence: 98%

Frequency detuning and power dependence of reflection from an electromagnetically induced absorption grating

Brown

Xiao

2005

Journal of Modern Optics

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When the strong-coupling laser beam is replaced by a standing wave under conditions of electromagnetically induced transparency (EIT) in a three-level atomic vapour, an electromagnetically induced absorption grating is formed. The weak probe beam in this EIT system is partially reflected by this absorption grating under certain conditions. The dependences of reflection signals on frequency detuning and coupling laser power are presented.

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Section: Discussionmentioning

confidence: 98%

Frequency detuning and power dependence of reflection from an electromagnetically induced absorption grating

Brown

Xiao

2005

Journal of Modern Optics

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“…9 that γ c increases with θ , under the influence of the residual Doppler broadening [24], the Kerr focusing of the probe, or possibly the transverse inhomogeneity of the pump intensity. The value of γ c at small angles, below 0.05γ , gives an indication of the intrinsic decoherence rate of the process.…”

Section: Experimental Verificationmentioning

confidence: 99%

Role of the phase-matching condition in nondegenerate four-wave mixing in hot vapors for the generation of squeezed states of light

et al. 2013

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Nondegenerate forward four-wave mixing in hot atomic vapors has been shown to produce strong quantum correlations between twin beams of light [McCormick et al., Opt. Lett. 32, 178 (2007)], in a configuration which minimizes losses by absorption. In this paper, we look at the role of the phase-matching condition in the trade-off that occurs between the efficiency of the nonlinear process and the absorption of the twin beams. To this effect, we develop a semiclassical model by deriving the atomic susceptibilities in the relevant doubleconfiguration and by solving the classical propagation of the twin-beam fields for parameters close to those found in typical experiments. These theoretical results are confirmed by a simple experimental study of the nonlinear gain experienced by the twin beams as a function of the phase mismatch. The model shows that the amount of phase mismatch is key to the realization of the physical conditions in which the absorption of the twin beams is minimized while the cross coupling between the twin beams is maintained at the level required for the generation of strong quantum correlations. The optimum is reached when the four-wave mixing process is not phase matched for fully resonant four-wave mixing.

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“…Recently, this feature of EIT was exploited to determine temperatures. In a first demonstration the dependence of the spectral bandwidth of EIT was measured as a function of the angle between the probe and control beam [11,12]. Analysis of the angle dependence yields information on the temperature of the medium.…”

Section: Introductionmentioning

confidence: 99%

Thermometry of ultracold atoms by electromagnetically induced transparency

et al. 2012

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We report on systematic numerical and experimental investigations of electromagnetically induced transparency (EIT) to determine temperatures in an ultracold atomic gas. The technique relies on the strong dependence of EIT on atomic motion (i.e., Doppler shifts), when the relevant atomic transitions are driven with counterpropagating probe and control laser beams. Electromagnetically induced transparency permits thermometry with satisfactory precision over a large temperature range, which can be addressed by the appropriate choice of Rabi frequency in the control beam. In contrast to time-of-flight techniques, thermometry by EIT is fast and nondestructive, i.e., essentially it does not affect the ultracold medium. In an experimental demonstration we apply both EIT and time-of-flight measurements to determine temperatures along different symmetry axes of an anisotropic ultracold gas. As an interesting feature we find that the temperatures in the anisotropic atom cloud vary in different directions.

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Angular dependence of an electromagnetically induced transparency resonance in a Doppler-broadened atomic vapor

Cited by 39 publications

References 28 publications

Frequency detuning and power dependence of reflection from an electromagnetically induced absorption grating

Frequency detuning and power dependence of reflection from an electromagnetically induced absorption grating

Role of the phase-matching condition in nondegenerate four-wave mixing in hot vapors for the generation of squeezed states of light

Thermometry of ultracold atoms by electromagnetically induced transparency

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