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Identifier	000367571
Title	Imaging Bose-Einstein condensates at ultra-low atom-numbers and time averaged adiabatic potentials
Alternative Title	Απεικόνιση συμπυκνωμάτων Bose-Einstein σε εξαιρετικά χαμηλό αριθμό ατόμων και μέσο-χρονικά αδιαβατικά δυναμικά
Author	Παππά, Μελίνα
Thesis advisor	Ρακιτζής, Πέτρος
Thesis advisor	Klitzing, Von Wolf
Abstract	This thesis presents theoretical principles on laser cooling and trapping as well as magnetic trapping and evaporative cooling, methods necessary for Bose-Einstein condensation. It presents the construction of a very dependable BEC machine. We demonstrate a novel class of trapping potentials, time-averaged adiabatic potentials (TAAP) which allows the generation of a large variety of traps and waveguides for ultracold atoms. The ring-geometry is of particular interest for guided matter-wave interferometry as it provides a perfectly smooth waveguide of controllable diameter, and thus a tunable sensitivity of the interferometer. In addition we report the experimental realization of double-well traps based on TAAP traps. Quantum degenerate Fermi gases and Bose-Einstein condensates give access to a vast new class of quantum states. The resulting multi-particle correlations places extreme demands on the detection schemes. Here we introduce diffractive dark-ground imaging as a novel ultra-sensitive imaging technique. We detect clouds with less than 30 atoms with near atom shot-noise limited signal to noise ratio. This presents an improvement of about one order of magnitude when compared to our standard absorption imaging. We also examine the optimal conditions for absorption imaging including saturation and fluorescence contributions.
Language	English
Subject	BEC
	TAAP
Issue date	2012-01-12
Collection	School/Department--School of Sciences and Engineering--Department of Physics--Doctoral theses
	Type of Work--Doctoral theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/e/2/4/metadata-dlib-14170eb52686567cdc511326c7ee603b_1310550218.tkl
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