Improvement of the frequency stability below the dick limit with a continuous atomic fountain clock

Devenoges, Laurent; Stefanov, André; Joyet, A.; Thomann, P.; Domenico, G. Di

doi:10.1109/tuffc.2012.2181

Cited by 25 publications

(15 citation statements)

References 16 publications

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“…Zero-dead-time operation of pulsed, time-domain cold-atom interferometers has been achieved in long-interrogation-time fountain geometries [31]. The continuous cold-atom fountain clock FOCS-2 is based on a 3Dcooled atom beam, also with a long interrogation time and a highly curved parabolic trajectory [32]. The long interrogation times achieved in fountain geometries can improve sensitivity, while highly curved atomic trajectories can reduce decoherence due to scattered light.…”

Section: Introductionmentioning

confidence: 99%

A continuous, sub-Doppler-cooled atomic beam interferometer for inertial sensing

Kwolek,

Black

2021

Preprint

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We present the first demonstration of an inertially sensitive atomic interferometer based on a continuous, rather than pulsed, atomic beam at sub-Doppler temperatures in three dimensions. We demonstrate 30% fringe contrast in continuous, inertially sensitive interference fringes at interrogation time T = 6.7 ms and a short-term phase measurement noise of 530 µrad/ √ Hz as inferred from interference measurements. Atoms are delivered to the interferometer by a cold-rubidium source that produces a high flux of atoms at temperature ≤ 15 µK in three dimensions while reducing near-resonance fluorescence in the downstream path of the atoms. We describe the optimization of the interrogating Raman beams to achieve high contrast, and validate interferometer operation through comparison with measurements by commercial accelerometers. We further provide a demonstration of zero-dead-time phase-shear readout of atom interferometer phase, achieving a measurement rate up to 160 Hz. This demonstration lays the groundwork for future gyroscope/accelerometer sensors that measure continuously, with both high bandwidth and high sensitivity, and on dynamic platforms.

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Section: Introductionmentioning

confidence: 99%

A continuous, sub-Doppler-cooled atomic beam interferometer for inertial sensing

Kwolek,

Black

2021

Preprint

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“…Our alternative approach to atomic fountain clocks is based on a continuous beam of cold atoms. Besides making the intermodulation effect negligible [5][6][7], a continuous beam is also interesting from the metrological point of view. Indeed, the relative importance of the contributions to the error budget is different [8,9], in particular for density related effects (collisional shift and cavity pulling) and furthermore the evaluation methods differ notably.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the magnetic field profile in the atomic fountain clock FoCS-2 using Zeeman spectroscopy

et al. 2017

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Abstract. We report the evaluation of the second order Zeeman shift in the continuous atomic fountain clock FoCS-2. Because of the continuous operation and of its geometrical constraints, the methods used in pulsed fountains are not applicable. We use here time-resolved Zeeman spectroscopy to probe the magnetic field profile in the clock. The pulses of ac magnetic excitation allow us to spatially resolve the Zeeman frequency and to evaluate the Zeeman shift with a relative uncertainty smaller than 1 × 10 −16 .

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“…Cold atomic beams are widely used in fields of atom interferometry [1][2][3], atomic clocks [4][5][6][7], cold atom collisions [4,8,9] and atom optics [10]. They are also required for fast loading a magneto-optical trap (MOT) in ultra high vacuum (UHV).…”

Section: Introductionmentioning

confidence: 99%

Intense source of cold cesium atoms based on a two-dimensional magneto–optical trap with independent axial cooling and pushing

et al. 2016

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We report our studies on an intense source of cold cesium atoms based on a two-dimensional magneto-optical trap with independent axial cooling and pushing. The new-designed source, proposed as 2D-HP MOT, uses hollow laser beams for axial cooling and a thin pushing laser beam for cold atomic beam extraction. Regulated independently by the pushing beam, the atomic flux can be substantially optimized. The atomic flux maximum obtained in the 2D-HP MOT is 4.02 × 10 10 atoms/s, increased by 60 percent compared to the traditional 2D + MOT in our experiment. Moreover, with the pushing power 10 µW and detuning 0Γ, the 2D-HP MOT can generate a rather intense cold cesium atomic beam with the concomitant light shift suppressed by 20 times in magnitude. The axial velocity distribution of the cold cesium beams centers at 6.8 m/s with a FMHW of about 2.8 m/s. The dependences of the atomic flux on the pushing power and detuning are studied. The experimental results are in good agreement with the theoretical model.

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Improvement of the frequency stability below the dick limit with a continuous atomic fountain clock

Cited by 25 publications

References 16 publications

A continuous, sub-Doppler-cooled atomic beam interferometer for inertial sensing

A continuous, sub-Doppler-cooled atomic beam interferometer for inertial sensing

Measurement of the magnetic field profile in the atomic fountain clock FoCS-2 using Zeeman spectroscopy

Intense source of cold cesium atoms based on a two-dimensional magneto–optical trap with independent axial cooling and pushing

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