The Temperature of Optical Molasses for Two Different Atomic Angular Momenta

Gerz, C.; Hodapp, Theodore; Jessen, Poul; Jones, K. M.; Phillips, William D.; Westbrook, Christoph I; Mølmer, Klaus

doi:10.1209/0295-5075/21/6/005

Cited by 30 publications

(9 citation statements)

References 20 publications

(14 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This behavior is consistent with predictions for polarization-gradient cooling and has been observed by many groups in the absence of multiple scattering. 15,17,21 The data can also be represented on a universal plot in which the horizontal axis is the dimensionless Stark shift parameter ⍀ 2 / ␦⌫ as shown in Fig. 7(b).…”

Section: E Temperature As a Function Of Intensity In The Multiple-scmentioning

confidence: 99%

Measurements of temperature scaling laws in an optically dense magneto-optical trap

et al. 2005

View full text Add to dashboard Cite

We have studied the temperature scaling laws for the conditions under which a cloud of trapped 85 Rb atoms in the + / − configuration makes the transition from the temperature-limited regime to the multiple-scattering regime. Our experimental technique for measuring temperature relies on measuring the ballistic expansion of the cloud after turning off the confining forces and imaging the cloud size as a function of time with two CCD cameras. In the transition regime, the temperature T is shown to depend on the number of atoms N and the peak density n as ͑T − T o ͒ ϰ N 1/3 and as ͑T − T o ͒ ϰ n 2/3 , in a manner consistent with theoretical predictions. Here T o is defined as the equilibrium temperature of a low-density optical molasses. In the multiple-scattering regime we find that T ϰ⍀ 2 / ͑␦⌫͒, where ⍀ and ␦ are the Rabi frequency and the detuning of the trapping laser, respectively, and ⌫ is the natural linewidth of the cycling transition. We have also measured the ratio of temperatures along the axial and radial directions of the magnetic field gradient coils and find that the temperature is isotropic only if the intensities of the three orthogonal trapping beams are equal, and that the ratio is generally independent of trapping laser intensity and magnetic field gradient. Finally we demonstrate a measurement of the gravitational acceleration precise to Ϸ0.1% by tracking the center of the cloud during ballistic expansion.

show abstract

Section: E Temperature As a Function Of Intensity In The Multiple-scmentioning

confidence: 99%

Measurements of temperature scaling laws in an optically dense magneto-optical trap

et al. 2005

View full text Add to dashboard Cite

show abstract

“…When comparing laser cooling for different atoms, it is useful to scale the light shift and the average kinetic energy E k by the recoil energy, E r ≡h 2 k 2 /2M, of an atom with mass M absorbing or emitting a photon of momentumhk [18]. With this scaling, the near-universal behavior becomes apparent.…”

Section: Introductionmentioning

confidence: 99%

“…Typical experimental values of this minimum average kinetic energy in 3-D experiments are E k (min) = 32E r for rubidium (J = 3 → 4) [18], 26E r for cesium (J = 4 → 5) [19] and 22E r for sodium (J = 2 → 3) [17]. From the minimum, the average kinetic energy increases approximately linearly as a function of light shift with a slope of about 0.14 in one dimension [14][15][16]20] and 0.35 in three dimensions [18,19] for all atoms investigated so far.…”

Section: Introductionmentioning

confidence: 99%

Laser collimation of a chromium beam

et al. 1997

View full text Add to dashboard Cite

We have studied laser collimation of a chromium atomic beam using a transverse polarization gradient cooling scheme. We present detailed measurements of the angular distribution of atoms on the beam axis, over a broad range of laser intensities and detunings, including those that produce significant excitation, and observe collimation angles as small as 0.16Ϯ0.01 mrad ͑50% quantile͒. We compare our results with existing calculations based on assumptions of steady-state conditions and low excited-state population. ͓S1050-2947͑97͒09402-X͔ PACS number͑s͒: 32.80.Pj, 42.50.VkHere ⌫ is the linewidth of the transition, ⌬ is the laser de-*Present address:

show abstract

“…A number of experiments using trapped atoms with long interaction times and at large detunings have verified the theoretical predictions of these models, confirming, for the case of three dimensions, a linear dependence of the temperature on the light potential [5][6][7]. Experiments on one-dimensional cooling of trapped atoms have also demonstrated the expected linear dependence on the light potential [8,9].…”

Section: Mmentioning

confidence: 53%

Transverse laser cooling of a velocity-selected sodium atomic beam

Milic

Hoogerland

Baldwin

et al. 1996

Quantum Semiclass. Opt.

View full text Add to dashboard Cite

The transverse velocity distribution of a sodium atomic beam, laser cooled in one dimension, has been measured with sub-recoil resolution. A velocity-selective detection system was employed to separate the longitudinal and transverse velocity components to provide a direct measure of the transverse velocity distribution. The effects of varying the cooling laser intensity and detuning on the derived transverse temperature are presented, and show a remarkable insensitivity to the laser intensity. Atomic velocities within a factor of two of the recoil velocity are achieved.

show abstract

The Temperature of Optical Molasses for Two Different Atomic Angular Momenta

Cited by 30 publications

References 20 publications

Measurements of temperature scaling laws in an optically dense magneto-optical trap

Measurements of temperature scaling laws in an optically dense magneto-optical trap

Laser collimation of a chromium beam

Transverse laser cooling of a velocity-selected sodium atomic beam

Contact Info

Product

Resources

About