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Dissertation zugänglich unter
URN: urn:nbn:de:gbv:18-39585
URL: http://ediss.sub.uni-hamburg.de/volltexte/2008/3958/


Entwicklung eines neuartigen, laserbasierten, photonischen Wellenleiters für ultrakalte Atome

Design and Development of a novel, laser-based, photonic waveguide for ultracold atoms

Vorrath, Stefan

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 Dokument 1.pdf (11.672 KB) 


Basisklassifikation: 33.38
Institut: Physik
DDC-Sachgruppe: Physik
Dokumentart: Dissertation
Hauptberichter: Sengstock, Klaus (Prof. Dr.)
Sprache: Deutsch
Tag der mündlichen Prüfung: 11.12.2008
Erstellungsjahr: 2008
Publikationsdatum: 29.12.2008
Kurzfassung auf Englisch: In the field of ultracold quantum gases atom optics has been established as a completely
new discipline in the last years. This led to fundmentally new results in the field of research
of atom optical systems. In modern experiments especially strongly interacting
nonlinear systems are of great interest. Such a strongly correlated system consists of a
cold atomic quantum gas and a light field both embedded into a nonlinear medium.
This thesis documents for the first time that a two-dimensional photonic crystal fiber
can be used as a novel nonlinear medium for atom optical experiments. It shows that
cold atoms can be guided optically through this fiber with high efficiency and density.
In order to study this system a new experiment for creating cold optically guided atoms
has been built up. This complex experimental setup consists of high-stable laser sources,
optics and electronics for generating, manipulating and detecting cold atomic rubidium
ensembles as well as further elements for implementing photonic band gap fibers as
matter wave guides. One focal point of the thesis has been the detailed investigation
of the atomic flux through the fiber. This analysis demonstrates that the experimental
parameters governing the atomic flux are in a good agreement with a self-developed
numerical model as well as with other theoretical predictions.
For applying this system as injector for other quantum gas experiments or for atom
interferometry, a continuous, coherent atomic flux is necessary.
Studies demonstrate that such a regime can be reached by using an additional dipole
trap in front of the fiber. By properly chosen trap parameters this trap can be used
as a reservoir of cold atoms. With this optical setup the atomic flux can be kept up
significantly longer than in a pulsed guiding system.
Further the experimental possibilities of this nearly one-dimensional, cold, dense and
tightly embedded atomic system are of great interest. The analysis shows that because
of the generated atomic density and the energetic distribution of the atoms in the
fiber potential a coherent atom optics is feasible with this system. So this experiment
paves the way towards a novel, coherent matter wave guide. By exploiting the strongly
photonic interaction in the fiber other physical regimes especially in the field of nonlinear
optics can be reached. This includes for example the studies of four-wave-mixing
processes in the photonic band gap fiber. In a recent theoretical paper it has been
suggested to use the tunability of the atom-light-interaction to reach a photonic regime
of extremely strong repulsion. This possibly leads to decelerated or even stopped light
forming a so-called Tonks-Girardeau gas.

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