学位论文详细信息
A compact system for ultracold atoms
Bose-Einstein condensation;Cold gases;Magnetooptical devices;Magnetic traps;Evaporative cooling
Torralbo Campo, Lara ; Cassettari, Donatella ; Cassettari, Donatella
University:University of St Andrews
Department:Physics & Astronomy (School of)
关键词: Bose-Einstein condensation;    Cold gases;    Magnetooptical devices;    Magnetic traps;    Evaporative cooling;   
Others  :  https://research-repository.st-andrews.ac.uk/bitstream/handle/10023/3192/LaraTorralboCampoPhDThesis.pdf?sequence=6&isAllowed=y
来源: DR-NTU
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【 摘 要 】

This thesis describes the design, construction and optimisation of two compactsetups to produce ⁸⁷Rb Bose-Einstein condensates and dual ⁷Li-⁸⁷Rb Magneto-Optical Traps (MOTs). The motivation for compact systems is to have simplifiedsystems to cool the atoms. Thefirst experimental setup is based on a single pyrexglass 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 trapcreated 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.

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