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Optics Communications

A driven, trapped, laser cooled ion cloud: a forced damped oscillator

Martijn A. van Eijkelenborg, Kishan Dholakia, M.E.M Storkey, D.M Segal, Richard Claude Thompson

Published Jan 1, 1999• 10 citations
Publisher
DOI
10.1016/s0030-4018(98)00587-2

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A simple method of cooling the transverse motion of an ion cloud in a linear Paul trap with a single axial laser is proposed. Transverse thermal oscillations of ions are indirectly damped by the longitudinal laser friction via an additional radio-frequency potential that resonantly couples two degrees of freedom. The fundamental mechanism of the present cooling scheme is theoretically described with the help of a harmonic oscillator model. It is shown that the indirect cooling rate can be considerably enhanced when the frequencies of the transverse and longitudinal ion oscillations satisfy a certain relation. The validity of theoretical predictions is confirmed through molecular dynamics simulations in which the detailed three-dimensional configuration of a typical Paul trap is incorporated.