Evaporative Cooling in a Crossed Dipole Trap

Adams, Charles S.; Lee, Heun Jin; Davidson, Nir; Kasevich, Mark A.; Chu, Steven

doi:10.1103/physrevlett.74.3577

Cited by 235 publications

(217 citation statements)

References 16 publications

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“…Consequently, a rise of nuclear transparency T r inc A (Q 2 ) with Q 2 should give a signal for CT. Indeed, such a rise was observed in the E665 experiment [21] at Fermilab for exclusive production of ρ 0 mesons off nuclei what has been claimed as manifestation of CT.…”

Section: Eq (39) Correctly Reproduces the Limits (I) -(Iii)mentioning

confidence: 99%

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Nemchik

2003

Czechoslovak Journal of Physics

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Within a light-cone QCD formalism based on the Green function technique incorporating color transparency, coherence length effects and gluon shadowing we study electroproduction of vector mesons off nuclei. We found rather large color transparency effects in the range of Q 2 ≤ 10 ÷ 20 GeV 2 . They are stronger at low than at high energies and can be easily identified by HERMES or at JLab. We provide predictions for incoherent and coherent vector meson production for future measurements.

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Section: Eq (39) Correctly Reproduces the Limits (I) -(Iii)mentioning

confidence: 99%

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Nemchik

2003

Czechoslovak Journal of Physics

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“…We note that the disparities between the simulation results based on equation (1) and the experimental data for levels A, B and G can be resolved by assuming a lower atom temperature (which generally increases the contrast between t PI for CMIN and CMAX). There is evidence elsewhere that optical dipole traps can lead to sub-Doppler atomic temperatures 15,16 . Systematic errors resulting from lattice intensity variations have essentially no effect on the ratios.…”

Section: Model Of Photoionizationmentioning

confidence: 99%

Ionization of Rydberg atoms by standing-wave light fields

Anderson

Raithel

2013

Nat Commun

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When electromagnetic radiation induces atomic transitions, the size of the atom is usually much smaller than the wavelength of the radiation, allowing the spatial variation of the radiation field's phase to be neglected in the description of transition rates. Somewhat unexpectedly, this approximation, known as the electric dipole approximation, is still valid for the ionization of micrometre-sized atoms in highly excited Rydberg states by laser light with a wavelength of about the same size. Here we employ a standing-wave laser field as a spatially resolving probe within the volume of a Rydberg atom to show that the photoionization process only occurs near the nucleus, within a volume that is small with respect to both the atom and the laser wavelength. This evidence resolves the apparent inconsistency of the electric dipole approximation's validity for photoionization of Rydberg atoms, and it verifies the theory of light-matter interaction in a limiting case.

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“…Despite its simplicity, we show that this configuration is compatible with large elastic collision rates and leads to efficient evaporation. To do so, we lower the trap depth, as originally demonstrated by Adams et al [15] and now routinely implemented in many laboratories to achieve quantum degenerate gases (see e.g. [16][17][18][19][20][21][22][23]), by merely decreasing the power of the trap laser.…”

Section: Introductionmentioning

confidence: 99%

Evaporative cooling of a small number of atoms in a single-beam microscopic dipole trap

et al. 2013

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We demonstrate experimentally the evaporative cooling of a few hundred rubidium 87 atoms in a single-beam microscopic dipole trap. Starting from 800 atoms at a temperature of 125 µK, we produce an unpolarized sample of 40 atoms at 110 nK, within 3 s. The phase-space density at the end of the evaporation reaches unity, close to quantum degeneracy. The gain in phase-space density after evaporation is 10 3 . We find that the scaling laws used for much larger numbers of atoms are still valid despite the small number of atoms involved in the evaporative cooling process. We also compare our results to a simple kinetic model describing the evaporation process and find good agreement with the data.

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Evaporative Cooling in a Crossed Dipole Trap

Cited by 235 publications

References 16 publications

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Ionization of Rydberg atoms by standing-wave light fields

Evaporative cooling of a small number of atoms in a single-beam microscopic dipole trap

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