Contrast and linewidth of the coherent population trapping transmission hyperfine resonance line in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>87</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Rb</mml:mi><mml:mo>:</mml:mo></mml:math>Effect of optical pumping

Vanier, J.; Levine, M. W.; Janssen, Daniël; Delaney, M.J.

doi:10.1103/physreva.67.065801

Cited by 57 publications

(38 citation statements)

References 14 publications

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“…This occurs because of optical pumping into the trapped-state sublevels |F,m F = |1, − 1 , |1,0 , and |1, + 1 , so fewer atoms participate in EIT. Contrast data was fit to a four-level EIT model based on [33], in which a standard -scheme EIT with two input light fields was augmented with an additional ground state acting as a "trapped" state reached by excited-state decay and inaccessible to the light fields.…”

Section: B Coated-cell Eit Contrastsmentioning

confidence: 99%

Electromagnetically induced transparency in paraffin-coated vapor cells

et al. 2011

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Section: B Coated-cell Eit Contrastsmentioning

confidence: 99%

Electromagnetically induced transparency in paraffin-coated vapor cells

et al. 2011

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“…4 (a) correspond to probe intensities much higher than the saturation intensity of the 5S 1/2 − 5P 1/2 transition, propagation effects are expected to be small. For higher densities propagation of the light field in the optically thick medium must be included in the model [21], and the experimental data depart from the prediction of our simple model. A good agreement is found in both datasets, demonstrating that the measured ionization signal can be directly correlated with the Rydberg state population.…”

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confidence: 99%

Electrical Readout for Coherent Phenomena Involving Rydberg Atoms in Thermal Vapor Cells

et al. 2013

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We present a very sensitive and scalable method to measure the population of highly excited Rydberg states in a thermal vapor cell of rubidium atoms. We detect the Rydberg ionization current in a 5 mm electrically contacted cell. The measured current is found to be in excellent agreement with a theory for the Rydberg population based on a master equation for the three level problem including an ionization channel and the full Doppler distributions at the corresponding temperatures. The signal-to-noise ratio of the current detection is substantially better than purely optical techniques.PACS numbers: 32.80. Rm, 03.67.Lx, 42.50.Gy Coherent phenomena involving strongly interacting Rydberg atoms have recently led to the demonstration of first quantum devices like quantum logic gates [1][2][3] and single photon sources [4] based on ultracold atoms. All these experiments require precise control over the highly excited states populations, which can be probed directly by field ionization [5,6] or by fluorescence techniques involving Rydberg shielding [7]. Since the strong vdW interaction has recently also been observed in vapor cells [8], scalable quantum devices based on the Rydberg blockade in above room temperature ensembles seem to be also within reach [9]. However, ion detectors as electron multipliers or multi-channel plates cannot be used in dense thermal vapors. For this reason, in thermal cells, most studies today use an indirect measurement of the excited state population by analyzing light fields leaving the atomic ensemble. Nevertheless, it is desirable to study not only the back-action of the vapor on the light, typically via electromagnetically induced transparency (EIT) [10], but also to measure directly the number of excited Rydberg states. One method, developed almost a century ago [11,12], makes use of thermionic diodes [13][14][15]. There, one of the electrodes is heated to emit electrons, which produce space charge limited gain for the amplification of ionized Rydberg atoms. The need of long ion trapping times requires large geometries for the space charge region, and an additional shielded excitation region to minimize the effect of disturbing electric fields during excitation of the highly polarizable Rydberg atoms. Despite its high sensitivity, this drawback sets a practical limitation for further applications where size and scalability play a role.Here we demonstrate that, in a symmetric configuration of atomic vapor between two transparent field plates, sizable currents in the nA regime reflect directly the Rydberg population and can be used as a probe with very good signal-to-noise ratio. This opens unique possibilities to probe very efficiently small spectroscopic features involving Rydberg states in thermal vapor but also might be used to stabilize lasers. By extending this concept to an array of pixel-wise arranged electrodes, high resolution spatial information on the Rydberg population can be obtained.The experiments were performed with the setup schematically shown in Fig. 1. The Rb va...

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“…[4][5][6] Vertical-cavity surface-emitting lasers (VCSELs), with typical spectral bandwidth of 100 MHz, are commonly used in conventional CPT clocks. 7 The VCSEL injection current is directly modulated at the microwave frequency ν hf /2 where hν hf is the ground-state hyperfine energy level splitting, termed as half band modulation (HBM). 6 This allows to emit an optical comb where the two first optical sidebands are used to excite CPT resonance.…”

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confidence: 99%

Quasi-bichromatic laser for a lin⊥lin coherent population trapping clock produced by vertical-cavity surface-emitting lasers

Yun

Tan

Deng

et al. 2012

Review of Scientific Instruments

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With two vertical-cavity surface-emitting lasers working under the master-slave sideband injection-locking configuration, we have realized a quasi-bichromatic laser beam with residual phase noise Δφ(2) < 0.282 rad(2). The two wanted frequency components share more than 96% power of the beam. With the realized beam, we have carried out coherent population trapping (CPT) resonance experiment with (87)Rb in the lin[perpendicular]lin CPT scheme, and recorded CPT resonance signal with contrast of 60%. Such laser system is promising to realize a lin[perpendicular]lin CPT clock with high performance and low power consumption.

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Contrast and linewidth of the coherent population trapping transmission hyperfine resonance line in87Rb:Effect of optical pumping

Cited by 57 publications

References 14 publications

Electromagnetically induced transparency in paraffin-coated vapor cells

Electromagnetically induced transparency in paraffin-coated vapor cells

Electrical Readout for Coherent Phenomena Involving Rydberg Atoms in Thermal Vapor Cells

Quasi-bichromatic laser for a lin⊥lin coherent population trapping clock produced by vertical-cavity surface-emitting lasers

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