Laser cooling of trapped ions: the influence of micromotion
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1994
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American Physical Society
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Abstract
Laser cooling of a single trapped ion in a Paul trap is discussed theoretically in the Lamb-Dicke limit, with full consideration of the time dependence of the trapping potential. Resulting mean kinetic energies are defined as time averages over one period of the micromotion and are compared with final temperatures expected from the laser cooling treatment with harmonic traps. For laser-atom detunings close to the micromotion frequency the results differ significantly from those expected for a harmonic trap potential. A physical interpretation is given and simple formulas are derived for the strong confinement case.
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© 1994 The American Physical Society.
J.I.C. and R.B. acknowledge travel support from NATO. R B. is supported in part by the Deutsche Forschungsgemeinschaft. L.3.G. is supported in part by DGCYT under Contract No. PB-0052 and by a Basque Country Grant. He also thanks the Instituto de Optica, CSIC, for its hospitality. The work at JILA is supported in part by the National Science Foundation. The ESA IUE Observatory is affiliated with the Astrophysics Division, Space Science Department, ESTEC.