Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558119
Title: A compact system for ultracold atoms
Author: Torralbo Campo, Lara
Awarding Body: University of St Andrews
Current Institution: University of St Andrews
Date of Award: 2012
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Abstract:
This thesis describes the design, construction and optimisation of two compact setups to produce ⁸⁷Rb Bose-Einstein condensates and dual ⁷Li-⁸⁷Rb Magneto- Optical Traps (MOTs). The motivation for compact systems is to have simplified systems to cool the atoms. The first experimental setup is based on a single pyrex glass cell without the need for atom chips. Fast evaporation will be achieved in a hybrid trap comprising of a magnetic quadrupole trap and an optical dipole trap created by a Nd:YVO4 laser and with future plans of using a Spatial Light Modulator (SLM). To enhance an efficient and rapid evaporation, we have investigated Light-Induced Atomic Desorption (LIAD) to modulate the Rb partial pressure during the cooling and trapping stage. With this technique, a ⁸⁷Rb MOT of 7 x 10⁷ atoms was loaded by shining violet light from a LED source into the glass cell, whose walls are coated with rubidium atoms. The atoms were then cooled by optical molasses and then loaded into a magnetic trap where lifetime measurements demonstrated that LIAD improves on magnetically-trapped atoms loaded from constant background pressure by a factor of six. This is quite encouraging and opens the possibility to do a rapid evaporation. In a second experiment, we have designed a compact system based on a stainless steel chamber to trap either ⁷Li or ⁶Li atoms in a MOT loaded from alkali-metal dispensers without the need of conventional oven-Zeeman slower. This setup can also load ⁸⁷Rb atoms, allowing future projects to simultaneously produce degenerate quantum gases of bosonic ⁸⁷Rb and fermionic ⁶Li atoms.
Supervisor: Cassettari, Donatella Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.558119  DOI: Not available
Keywords: Bose-Einstein condensation ; Light-induced atomic desorption ; Ultracold atoms ; Dual magneto-optical trap ; Bose-Fermi mixtures ; Evaporative cooling ; Single cell setup
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