Vacuum-pressure measurement using a magneto-optical trap

Arpornthip, Tanwa; Sackett, C. A.; Hughes, K. J.

doi:10.1103/physreva.85.033420

Cited by 78 publications

(105 citation statements)

References 22 publications

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“…These results indicate that the main limitation of our measurements is the backgroundlimited lifetime of the atoms in the trap, which we estimate to correspond to a pressure of PՇ3 Â 10 À9 Torr. 28 The above results demonstrate that high fidelity state detection is achievable using sCMOS sensors despite the limited quantum efficiency compared to EMCCD cameras as summarised in Table I, meaning simply scattering more photons and thus slightly increased heating to achieve the same number of photon detection events but still providing excellent performance. For experiments requiring a fast repetition rate, readout time is also a consideration.…”

Section: Snrmentioning

confidence: 75%

Single atom imaging with an sCMOS camera

Picken

Legaie

Pritchard

2017

Applied Physics Letters

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Single atom imaging requires discrimination of weak photon count events above background and has typically been performed using either EMCCD cameras, photomultiplier tubes or single photon counting modules. sCMOS provides a cost effective and highly scalable alternative to other single atom imaging technologies, offering fast readout and larger sensor dimensions. We demonstrate single atom resolved imaging of two siteaddressable optical traps separated by 10 µm using an sCMOS camera, offering a competitive signal-to-noise ratio at intermediate count rates to allow high fidelity readout discrimination (error < 10 −6 ) and sub-µm spatial resolution for applications in quantum technologies.

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Section: Snrmentioning

confidence: 75%

Single atom imaging with an sCMOS camera

Picken

Legaie

Pritchard

2017

Applied Physics Letters

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“…Since K and Rb are different species RCE is not possible, but nonresonant charge exchange (nRCE) is. However, careful experimental tests allow us to conclude that this channel is MOT [28].…”

Section: Doimentioning

confidence: 99%

Collisional Cooling of Light Ions by Cotrapped Heavy Atoms

2017

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We experimentally demonstrate cooling of trapped ions by collisions with co-trapped, higher mass neutral atoms. It is shown that the lighter 39 K + ions, created by ionizing 39 K atoms in a magneto-optical trap (MOT), when trapped in an ion trap and subsequently allowed to cool by collisions with ultracold, heavier 85 Rb atoms in a MOT, exhibit a longer trap lifetime than without the localized 85 Rb MOT atoms. A similar cooling of trapped 85 Rb + ions by ultracold 133 Cs atoms in a MOT is also demonstrated in a different experimental configuration to validate this mechanism of ion cooling by localized and centered ultracold neutral atoms. Our results suggest that cooling of ions by localized cold atoms holds for any mass ratio, thereby enabling studies on a wider class of atom-ion systems irrespective of their masses. DOI:PACS numbers: 37.10.Rs, 37.10.Ty, 37.10.DeThe cooling and trapping of dilute gases of ions [1,2] and atoms [3] has led to unprecedented precision in spectroscopy [4] and the study of interacting many particle systems [5]. Co-trapping ions and atoms [6][7][8][9][10][11][12][13][14] widens the scope of inquiry to the two-particle asymptotic interaction. Among the different methods to cool trapped ions, cooling by elastic collisions with cold neutral atoms is arguably the most generic. Indeed, this has been extensively used in buffer gas cooling of relatively heavy ions by collisions with cold lower mass neutral atoms. However, the complementary phenomenon, that of cooling of low-mass ions by collisions with heavier neutral atoms, has never been demonstrated experimentally. This is partly because calculations show that trapped ions in a uniform buffer gas will heat up when the ratio of the atom mass ( ) to the ion mass ( ) exceeds a critical value [15][16][17][18]. In recent years, theoretical studies suggest a possible experimental resolution by using a localized ensemble of ultracold neutral atoms placed precisely at the centre of the ion trap [12,19].In ) we demonstrate cooling for, exceed the critical mass ratios (CMRs) [15][16][17][18] beyond which ion heating is predicted for uniform atomic gas densities. The experiment is consistent with our Monte Carlo (MC) simulations and other theoretical models [19] that consider collisions with centrally localized density (as opposed to uniform density) of cold atoms. We further demonstrate the competing ion heating mechanism due to collisions with the background gas vapour. The dependence of steady state ion temperature on the size of the cold atomic cloud is also established numerically. The present work lays the foundation for studies on a wider class of sympathetically cooled ion-atom mixtures and the resulting clarity may enable the realization of the few-partial-wave regime.Trapping and cooling ions and atoms. The conditions and mechanisms for trapping atoms and ions are different because the atom is neutral and the ion charged. Atom traps typically have small trap depths and use a combination of static magnetic and/or optical fields. Ions o...

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“…The solid curve is a fit to Eq. (9) in which R capture = 1.12(3) × 10 8 atoms/s and τ trap = 2.20(3) seconds, corresponding to an upper limit on the pressure in the 3D chamber of ≈ 1 × 10 −8 Torr [30]. The steady state MOT number is 2.46(7) × 10 8 atoms.…”

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confidence: 99%

Two-dimensional grating magneto-optical trap

Imhof

Stuhl²,

Kasch³

et al. 2017

Phys. Rev. A

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We demonstrate a two dimensional grating magneto-optical trap (2D GMOT) with a single input cooling laser beam and a planar diffraction grating using 87 Rb. This configuration increases experimental access when compared with a traditional 2D MOT. As described in the paper, the output flux is several hundred million rubidium atoms/s at a mean velocity of 16.5(9) m/s and a velocity distribution of 4(3) m/s standard deviation. We use the atomic beam from the 2D GMOT to demonstrate loading of a three dimensional grating MOT (3D GMOT) with 2.46(7) × 10 8 atoms. Methods to improve output flux are discussed.

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Vacuum-pressure measurement using a magneto-optical trap

Cited by 78 publications

References 22 publications

Single atom imaging with an sCMOS camera

Single atom imaging with an sCMOS camera

Collisional Cooling of Light Ions by Cotrapped Heavy Atoms

Two-dimensional grating magneto-optical trap

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