Energy distribution and cooling of a single atom in an optical tweezer

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 78, Issue 3, 2008, Pages

  Tuchendler, C ^a   Lance, A M ^a   Browaeys, A ^a   Sortais, Y R P ^a   Grangier, P ^a  

^a INSTITUT D'OPTIQUE GRADUATE SCHOOL   (France)

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC PHYSICS; BOLTZMANN EQUATION; COOLING; ELECTRIC POWER DISTRIBUTION; ION BEAMS; RUBIDIUM;

ADIABATIC COOLING; BOLTZMANN DISTRIBUTIONS; COOLING REGIMES; ENERGY DISTRIBUTIONS; MEAN ENERGY; OPTICAL TWEEZER; SINGLE ATOMS; TRAPPING POTENTIAL; TWO DIFFERENT METHODS;

ATOMS;

EID: 53349146123     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.78.033425     Document Type: Article

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30. We assume that an atom with an energy greater than the trap depth has sufficient time to exit the trap provided the following condition is fulfilled: 1/τ ν, where τ is the time the atom is in the trap and ν is the trap frequency in the axial direction. This condition is satisfied down to a final trap depth Uf / Ui ∼ 10-4, where τ× ν ∼10/1.
31. For the effective minimum trap depth Umin taking gravity into account turns out to be important for trap depths less than ∼10 μK because the gravity potential acts to tilt the trapping potential, thus lowering the potential barrier along the gravity axis.
32. After the release and recapture sequence we needed to bring the trap depth close to its initial value to measure if the atom is still present in the trap, otherwise the lasers sent on the atom would kick it out of the shallow trap too quickly to measure its presence.