magistrsko delo
Katja Gosar (Author), Rok Žitko (Mentor), Peter Jeglič (Co-mentor)

Abstract

V magistrski nalogi predstavimo uporabo optične pincete za eksperimente s hladnimi atomi in Bose-Einsteinovim kondenzatom. Na začetku predstavimo lastnosti Bose-Einsteinovih kondenzatov ter hlajenje atomov z laserskim hlajenjem in hlajenjem z izhlapevanjem. Teoretično obravnavamo optične dipolne pasti in interferenco dveh Bose-Einsteinovih kondenzatov. V nadaljevanju opišemo delovanje optične pincete in predstavimo meritev frekvence nihanja atomov v pasti optične pincete. V naslednjem poglavju predstavimo eksperimente. Demonstriramo hlajenje z izhlapevanjem v pasti optične pincete ter prenos iz statične dipolne pasti v optično pinceto. Izvedemo eksperimente premikanja in razcepa kondenzatov in oblakov hladnih atomov. V nadaljevanju prikažemo meritev interference dveh kondenzatov. Nazadnje obravnavamo kondenzat v škatlastem potencialu, pripravljenim z optično pinceto. Na kondenzatu, pripravljenem v škatlastem potencialu, opazujemo nastanek solitonskih vlakov in odziv kondenzata na periodično modulacijo sipalne dolžine.

Keywords

hladni atomi;Bose-Einsteinov kondenzat;optična pinceta;dipolne pasti;interferenca snovnih valov;solitonski vlaki;Faradayevi valovi;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FMF - Faculty of Mathematics and Physics
Publisher: [K. Gosar]
UDC: 539.1
COBISS: 75666947 Link will open in a new window
Views: 315
Downloads: 49
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Other data

Secondary language: English
Secondary title: The use of optical tweezers in experiments with cold atoms and Bose-Einstein condensate
Secondary abstract: This thesis presents the use of optical tweezers in experiments with cold atoms and Bose-Einstein condensate. First, we describe the properties of Bose-Einstein condensates and cooling of atoms with laser and evaporative cooling. We theoretically discuss optical dipole traps and the interference of two Bose-Einstein condensates. Next, we describe the operation of optical tweezers and present the measurement of the frequency of oscillations of atoms in an optical tweezer trap. In the next chapter, we present our experiments. Evaporative cooling in optical tweezers and the transfer of atoms from a static dipole trap to optical tweezers are demonstrated. Experiments of moving and splitting condensates and clouds of cold atoms are presented. Furthermore, we show the interference of two condensates. Finally, we observe a condensate in a box-like potential prepared with optical tweezers. In this set-up, we study the emergence of soliton trains and the response of the condensate to a periodic modulation of the scattering length.
Secondary keywords: cold atoms;Bose-Einstein condensate;optical tweezers;dipole traps;matter-wave interference;soliton trains;Fraday waves;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko
Pages: 49 str.
ID: 13352793