Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 3: Ultracold Atoms: Manipulation and Detection (with Q)
A 3.10: Vortrag
Montag, 14. März 2011, 12:45–13:00, SCH 251
Control of refractive index and motion of a single atom by quantum interference — •Tobias Kampschulte1, Wolfgang Alt1, Stefan Brakhane1, Martin Eckstein1,2, Miguel Martinez-Dorantes1, René Reimann1, Artur Widera1,3, and Dieter Meschede1 — 1Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn — 2Max-Born-Institut, Abteilung A2, Max-Born-Str. 2 A, 12489 Berlin — 3Fachbereich Physik der TU Kaiserslautern, Erwin-Schrödinger-Str., 67663 Kaiserslautern
The properties of an optically probed atomic medium can be changed dramatically by coherent interaction with a near-resonant control light field. I will present our experimental results on the elementary case of electromagnetically induced transparency (EIT) with a single neutral atom inside an optical cavity probed by a weak field [1]. We have observed modification of the dispersive and absorptive properties of a single atom by changing the frequency of the control light field in the off-resonant regime.
In this regime, the creation of a transparency window close to a narrow absorption peak can give rise to a sub-Doppler cooling mechanism. I will present the observation of strong cooling and heating effects in the vicinity of the two-photon resonance. The cooling increases the storage time of our atoms twenty-fold to about 16 seconds. Recent investigations of this effect outside the cavity using microwave sideband spectroscopy have revealed that a large fraction of atoms is cooled to the axial ground state of the trap.
[1] T. Kampschulte et al., Phys. Rev. Lett. 105, 153603 (2010)