Rubidium atomic funnel

Swanson, T. B.; Silva, N. J.; Mayer, Shannon K.; Maki, Jeffery J.; McIntyre, David

doi:10.1364/josab.13.001833

Cited by 29 publications

(20 citation statements)

References 13 publications

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“…The total flux extracted is close to the trapping rate of our MOT. As in [6], [12], but in contrast to [5], [9], the atomic beam is free from any superimposed laser beam, a clear advantage whenever the cold beam is to be used in precision experiments.…”

mentioning

confidence: 99%

A continuous beam of slow, cold cesium atoms magnetically extracted from a 2D magneto-optical trap

et al. 1998

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PACS. 32.80Pj -Optical cooling of atoms; trapping. PACS. 42.50Vk -Mechanical effects of light on atoms, molecules, electrons, and ions.Abstract. -Starting from a 2D magneto-optical trap where cesium atoms are permanently subjected to 3D sub-Doppler cooling and 2D magneto-optical trapping, we have produced a beam of cold atoms continuously extracted along the trap axis. The simplest extraction mechanism, presently used, is the drift velocity induced by a constant magnetic field. We have used this continuous beam of atoms to produce Ramsey fringes in a microwave cavity as a first demonstration of an atomic resonator operating continuously with laser cooled atoms. The shape of the resonance pattern allows an estimate of the axial temperature, typically 200 mK. The average velocity can be adjusted from 0.7 to 3 m/s; the trap-to-atomic-beam conversion efficiency is close to one.

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confidence: 99%

A continuous beam of slow, cold cesium atoms magnetically extracted from a 2D magneto-optical trap

et al. 1998

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“…In contrast, the larger divergence of the ultra cold beam [34] unavoidably complicates the design of the experiment (see proposal 2, §V B). Other 2D-MOT, among those delivering larger atomic fluxes [35][36][37], have, for the present application, the drawback of either a larger divergence or a larger velocity spread. On the other hand, the features needed here, high flux, moderate velocity and low divergence are met by other techniques, namely Zeeman slowing.…”

Section: Use Of a Slow And Cold Atomic Beam Excited By A Colinearmentioning

confidence: 97%

“…On Figure 2 we plot the quality factor versus the velocity for several beams of cold stable atoms chosen among those having a small spread of longitudinal velocities. The existing designs present themselves as grouped into three categories : the ultra-cold beams using a moving molasses [33,34], the cold beams extracted from a 2D-MOT [30,35,36,39] and the Zeeman-slowed device using a collimator [38]. In view of optimizing APV measurements on stable atoms, this last device is expected to lead to the best results, although the pyramidal trap remains of real interest due to its simplicity and probably better adaptability to radioactive isotopes.…”

Section: Use Of a Slow And Cold Atomic Beam Excited By A Colinearmentioning

confidence: 99%

Prospects for forbidden-transition spectroscopy and parity violation measurements using a beam of cold stable or radioactive atoms

Sanguinetti

Guéna

Lintz

et al. 2003

The European Physical Journal D - Atomic, Molecular and Optical

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Laser cooling and trapping offers the possibility of confining a sample of radioactive atoms in free space. Here, we address the question of how best to take advantage of cold atom properties to perform the observation of as highly forbidden a line as the 6S-7S Cs transition for achieving, in the longer term, Atomic Parity Violation measurements in radioactive alkali isotopes. Another point at issue is whether one might do better with stable, cold atoms than with thermal atoms. To compensate for the large drawback of the small number of atoms available in a trap, one must take advantage of their low velocity. To lengthen the time of interaction with the excitation laser, we suggest choosing a geometry where the laser beam exciting the transition is colinear to a slow, cold atomic beam, either extracted from a trap or prepared by Zeeman slowing. We also suggest a new observable physical quantity manifesting APV, which presents several advantages: specificity, efficiency of detection, possibility of direct calibration by a parity conserving quantity of a similar nature. It is well adapted to a configuration where the cold atomic beam passes through two regions of transverse, crossed electric fields, leading both to differential measurements and to strong reduction of the contributions from the M1-Stark interference signals, potential sources of systematics in APV measurements. Our evaluation of signal to noise ratios shows that with available techniques, measurements of transition amplitudes, important as required tests of Atomic Theory should be possible in 133 Cs with a statistical precision of 10 −3 and probably also in Fr isotopes for production rates of > ∼ 10 6 Fr atoms s −1 . For APV measurements to become realistic, some practical realization of the collimation of the atomic beam as well as multiple passages of the excitation beam matching the atomic beam looks essential.

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“…First, one has to build a source of cold atoms as intense as possible, and secondly, one has then to inject the atoms into a magnetic guide, where they should propagate with reduced losses over a long distance. When resonant laser light is available at the atomic resonance frequency, a convenient method for producing a bright source of slow atoms consists in decelerating a thermal beam with radiation pressure [20,21], and subsequently applying transverse cooling and trapping to the slow atomic beam ("atom funnel") [22,23,24,25,26]. Alternatively, one can extract a jet of atoms from a vaporloaded magneto-optical trap (MOT).…”

Section: Introductionmentioning

confidence: 99%

“…The simplest scheme consists in a 2D MOT [27,28] where the MOT laser beams propagate only in the xy plane, resulting in a uncooled atom jet along the z axis. As for some of the demonstrated funnels [22,24,26], one can narrow the longitudinal velocity distribution, using a moving molasses scheme, i.e., a pair of counter-propagating laser beams along the atomic beam axis, with two different frequencies [29]. The atoms are then bunched in a non-zero velocity class, which corresponds to the moving frame where both lasers are seen with equal frequencies.…”

Section: Introductionmentioning

confidence: 99%

Loading of a cold atomic beam into a magnetic guide

Cren

Roos

Aclan

et al. 2002

The European Physical Journal D - Atomic, Molecular and Optical

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Abstract. We demonstrate experimentally the continuous and pulsed loading of a slow and cold atomic beam into a magnetic guide. The slow beam is produced using a vapor loaded laser trap, which ensures twodimensional magneto-optical trapping, as well as cooling by a moving molasses along the third direction. It provides a continuous flux larger than 10 9 atoms/s with an adjustable mean velocity ranging from 0.3 to 3 m/s, and with longitudinal and transverse temperatures smaller than 100 µK. Up to 3 10 8 atoms/s are injected into the magnetic guide and subsequently guided over a distance of 40 cm.

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Rubidium atomic funnel

Cited by 29 publications

References 13 publications

A continuous beam of slow, cold cesium atoms magnetically extracted from a 2D magneto-optical trap

A continuous beam of slow, cold cesium atoms magnetically extracted from a 2D magneto-optical trap

Prospects for forbidden-transition spectroscopy and parity violation measurements using a beam of cold stable or radioactive atoms

Loading of a cold atomic beam into a magnetic guide

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