Deeply subrecoil two-dimensional Raman cooling

Boyer, Vincent; Lising, L. J.; Rolston, S. L.; Phillips, William D.

doi:10.1103/physreva.70.043405

Cited by 22 publications

(20 citation statements)

References 23 publications

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“…In cold atomic ensembles and atomic beams, stimulated Raman transitions [1] have been used to select narrow velocity classes for velocimetry [2], atom interferometry [3], subrecoil Raman cooling [4], and magnetometry [5,6].…”

Section: Introductionmentioning

confidence: 99%

Imaging velocity selective resonances in a magnetic field

Fatemi

Terraciano

Dutton

et al. 2009

Journal of Modern Optics

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We demonstrate techniques for imaging both magnetic fields and magnetic sublevel distributions using velocityselective Raman transitions in cold 87 Rb and 85 Rb ensembles. When an expanding atom cloud is exposed to counterpropagating laser beams, resonant atom trajectories undergoing Raman transitions are perturbed and result in distinctive features in images of the expanded cloud. If the counterpropagating laser fields couple magnetic sublevels in different hyperfine manifolds, the images provide a spectrograph of sublevel occupation. The techniques are simple to implement and provide a useful, rapid diagnostic tool for cold atom experiments.

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Section: Introductionmentioning

confidence: 99%

Imaging velocity selective resonances in a magnetic field

Fatemi

Terraciano

Dutton

et al. 2009

Journal of Modern Optics

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“…The "dark state" cooling [26] is very efficient but also lim-ited to rather collisionless situations (low densities). Raman cooling, on the other hand, is not so density-limited, and deep subrecoil cooling in 1D has been demonstrated [27] and extended to 2D and 3D cooling [28,29] as well. The lowest temperature in 2D, achieved for Cs atoms at NIST, Gaithersburg, is 0.15T rec [29], where T rec is the atomic recoil temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Raman cooling, on the other hand, is not so density-limited, and deep subrecoil cooling in 1D has been demonstrated [27] and extended to 2D and 3D cooling [28,29] as well. The lowest temperature in 2D, achieved for Cs atoms at NIST, Gaithersburg, is 0.15T rec [29], where T rec is the atomic recoil temperature. The suppression of further cooling is associated with the required cumbersome setup of four Raman beam pairs as well as limitations of the assumed Λ-type atomic state system.…”

Section: Introductionmentioning

confidence: 99%

Robust two-dimensional subrecoil Raman cooling by adiabatic transfer in a tripod atomic system

2012

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We demonstrate two-dimensional robust Raman cooling in a four-level tripod system, in which velocity-selective population transfer is achieved by a STIRAP pulse. In contrast to basic 2D Raman cooling with square envelope pulses [Phys. Rev. A 83, 023407 (2011)], the technique presented here allows for a wide variation in the pulse duration and amplitude once the adiabaticity criterion is satisfied. An efficient population transfer together with attaining of a narrow spread of the resonant-velocity group leads to the narrowing of the velocity-distribution spread down to 0.1vrec, corresponding to an effective temperature equal to 0.01Trec. This robust method opens new possibilities for cooling of neutral atoms.

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“…The 2D scheme with square pulses was applied to Cs atoms at NIST, Gaithersburg, MD, giving temperatures down to 0.15T rec [19], where T rec is the atomic recoil temperature. This is actually the only demonstrated case of reaching subrecoil temperatures with true 2D Raman cooling.…”

Section: Introductionmentioning

confidence: 99%

Efficient two-dimensional subrecoil Raman cooling of atoms in a tripod configuration

2011

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We present an efficient method for subrecoil cooling of neutral atoms by applying Raman cooling in two dimensions to a four-level tripod system. The atoms can be cooled simultaneously in two directions using only three laser beams. We describe the cooling process with a simple model showing that the momentum distribution can be rapidly narrowed to velocity spread down to 0.1v rec , corresponding to effective temperature equal to 0.01T rec . This method opens new possibilities for cooling of neutral atoms.

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Deeply subrecoil two-dimensional Raman cooling

Cited by 22 publications

References 23 publications

Imaging velocity selective resonances in a magnetic field

Imaging velocity selective resonances in a magnetic field

Robust two-dimensional subrecoil Raman cooling by adiabatic transfer in a tripod atomic system

Efficient two-dimensional subrecoil Raman cooling of atoms in a tripod configuration

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