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The dissipative force terms which appear in the center-of-mass motion of a trapped atom which is illuminated by two laser beams are explored. The laser parameters are chosen such that the system is driven to electromagnetically induced transparency. In this situation rapid cooling to the ground vibrational level of the trap occurs [1] .
Our work aims at resolving the origin of dissipative terms in the interaction of the trapped atom with light. We expected these to appear in the form of Moessbauer-type recoil absorption by the external trap and by spontaneous emission events. Our results indicate that the primary reason for cooling is the weak AC-Stark shift in combination with an EIT-absorption window which has to be of the order of the trap level spacing in order for cooling to be efficient.
[1] M. Roghani and H. Helm, Phys. Rev. A. 77, 043418 (2008). |
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