Efficient Collection of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>221</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Fr into a Vapor Cell Magneto-optical Trap

Lu, Zheng‐Tian; Corwin, Kristan L.; Vogel, K. R.; Wieman, Carl; Dinneen, T.; Maddi, Jason; Gould, Harvey

doi:10.1103/physrevlett.79.994

Cited by 88 publications

(69 citation statements)

References 20 publications

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“…This kind of cell is widely used in many experiments concerning the magneto-optical trapping of radioactive isotopes or rare atoms [1,2], atomic clocks [3], magnetometers [4][5][6], fundamental symmetry studies [7], electromagnetically induced transparency [8], spin squeezing [9], longlived entanglement [10] and quantum memory [11].…”

Section: Introductionmentioning

confidence: 99%

Diffusion of Rb atoms in paraffin-coated resonant vapor cells

et al. 2017

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Abstract. We present the results of a study of the diffusion of Rb atoms in paraffin -coated resonant vapor cells. We have modeled the Rb diffusion both in the cell and in the coating, assuming that the main loss of Rb atoms is due to the physical absorption of the atoms by the glass substrate. It is demonstrated that the equilibrium atomic density in the cell is a monotonic function of the thickness of the paraffin coating: the density increases with an increase in the thickness of the coating. The diffusion coefficient for rubidium in paraffin thin films has been determined to be equal to 4.7  10 -7 cm 2 /s. The results of the experiment might be useful for a better understanding of the details involved in the processes of the interaction of alkali atoms with a paraffin coating and atomic diffusion in resonant vapor cells.

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Section: Introductionmentioning

confidence: 99%

Diffusion of Rb atoms in paraffin-coated resonant vapor cells

et al. 2017

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“…29 While cells with diameters from a few to tens of centimeters are typically employed, miniature millimeter-sized cells with paraffin coating have also been explored. 30 In addition, similar coatings with silicon head groups have been used in magneto-optical traps, [31][32][33][34] hollow photonic fibers, 35,36 and noble-gas-atom optical pumping cells. 37,38 Alkali atoms in the vapor phase depolarize upon contact with the bare surface of a glass container, limiting the coherence lifetime of the spin ensemble.…”

Section: Introductionmentioning

confidence: 99%

Investigation of antirelaxation coatings for alkali-metal vapor cells using surface science techniques

Seltzer¹,

Michalak²,

Donaldson³

et al. 2010

The Journal of Chemical Physics

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Many technologies based on cells containing alkali-metal atomic vapor benefit from the use of anti-relaxation surface coatings in order to preserve atomic spin polarization. In particular, paraffin has been used for this purpose for several decades and has been demonstrated to allow an atom to experience up to 10,000 collisions with the walls of its container without depolarizing, but the details of its operation remain poorly understood. We apply modern surface and bulk techniques to the study of paraffin coatings, in order to characterize the properties that enable the effective preservation of alkali spin polarization. These methods include Fourier transform infrared spectroscopy, differential scanning calorimetry, atomic force microscopy, near-edge X-ray absorption fine structure spectroscopy, and X-ray photoelectron spectroscopy. We also compare the light-induced atomic desorption yields of several different paraffin materials. Experimental results include the determination that crystallinity of the coating material is unnecessary, and the detection of C=C double bonds present within a particular class of effective paraffin coatings. Further study should lead to the development of more robust paraffin anti-relaxation coatings, as well as the design and synthesis of new classes of coating materials.

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“…The key properties of an antirelaxation coating are the absence of free electron spins, which could cause alkali-metal spin destruction, and a low dielectric constant, which could result in a low adsorption energy. These properties give alkali-metal atoms not only a long relaxation time [11][12] , but also an enhanced collection efficiency in laser cooling [13][14] . A glass tube connected to the bottom of the cell links the bulb to a cesium reservoir and an ion pump.…”

Section: Methodsmentioning

confidence: 99%

Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell

et al. 2015

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We report an experimental study on the temperature and number evolution of cold cesium atoms diffusively cooled inside a wall-coated glass cell by measuring the absorption profile of the 6 2 S1/2 (F=4)→6 2 P3/2 (F'=5) transition line with a weak probe laser in the evolution process. We found that the temperature of the cold atoms first gradually decreases from 16 mK to 9 mK, and then rapidly increases. The number of cold atoms first declines slowly from 2.1×10 9 to 3.7×10 8 and then falls drastically. A theoretical model for the number evolution is built and includes the instantaneous temperature of the cold atoms and a fraction p, which represents the part of cold cesium atoms elastically reflected by the coated cell wall. The theory is overall in good agreement with the experimental result and a nonzero value is obtained for the fraction p, which indicates that the cold cesium atoms are not all heated to the ambient temperature by a single collision with the coated cell wall. These results can provide helpful insight for precision measurements based on diffuse laser cooling.

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Efficient Collection of221Fr into a Vapor Cell Magneto-optical Trap

Cited by 88 publications

References 20 publications

Diffusion of Rb atoms in paraffin-coated resonant vapor cells

Diffusion of Rb atoms in paraffin-coated resonant vapor cells

Investigation of antirelaxation coatings for alkali-metal vapor cells using surface science techniques

Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell

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