Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.50: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Experiments with laser-cooled atoms trapped in the evanescent field surrounding an optical nanofiber — •Daniel Reitz1, Rudolf Mitsch1, Melanie Müller1, Samuel T. Dawkins2, and Arno Rauschenbeutel1 — 1Technische Universität Wien - Atominstitut, Stadionallee 2, A-1020 Wien — 2Johannes Gutenberg-Universität Mainz, AG QUANTUM, 55099 Mainz, Germany
We present recent results of experiments with Cs-atoms in our nanofiber-based optical dipole trap. The atoms are trapped in a 1d optical lattice formed by a two color-evanescent field sourrounding the optical nanofiber. Atoms inside the trap are detected by measuring the transmission of a weak probe beam, launched through the fiber. At resonance, each atom absorbs about one percent of the probe via evanescent field coupling, yielding a high optical density of up to 39 for about 2000 trapped atoms. Adding a second light field in the fiber allows us to coherently prepare the atomic ensemble. First results of measurements of the Autler Townes Effect as well as first observations of electromagnetically induced transparency are presented. Finally, in the dispersive regime, the interaction-induced phase shift experienced by the probe is measured, providing us with additional information. We show that by using this method, the lifetime of the atoms in our trap can be measured non-destructively. Our work opens the route towards the realization of hybrid quantum systems that combine atoms with, e.g., solid state quantum devices and towards non-linear optics applications. Financial support by the Volkswagen Foundation, the ESF and the FWF (CoQuS) is gratefully acknowledged.