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dc.contributor.advisorAndersen, Mikkel
dc.contributor.advisorMeglinski, Igor
dc.contributor.authorMcDowall, Peter Digby
dc.date.available2018-11-15T22:14:48Z
dc.date.copyright2014
dc.identifier.citationMcDowall, P. D. (2014). Atom Interferometry Using Near Resonant Standing Waves of Light (Thesis, Doctor of Philosophy). University of Otago. Retrieved from http://hdl.handle.net/10523/5094en
dc.identifier.urihttp://hdl.handle.net/10523/5094
dc.description.abstractThis thesis details the experimental investigation of a new type of atom interferometer using rubidium-85 atoms in the unexplored near-resonant domain. A cold cloud of atoms, all prepared in the same hyperfine ground state, are subjected to temporally periodic pulses of near-resonant standing waves of light. The standing wave pulses are made to act like an absorption grating where only atoms located around the low intensity region about the nodes remain in the initial ground state, the rest are pumped into a dark hyperfine ground state. The output of the atom interferometer is a measure of the fraction of atoms remaining in the initial ground state after N standing wave pulses for different times between the pulses. An increased survival rate is observed for certain times between pulses due to the occurrence of a coherence echo and the matter wave Talbot effect. This feature allows us to use our atom interferometer to make measurements of the Talbot time which is an important parameter in determinations of the fine structure constant alpha. We provide a theoretical model to describe the relevant physics behind our atom interferometer that compares well with our empirical results. Design and implementation of the apparatus are discussed along with characterisation of parameters such as pulse duration, pulse number, and frequency. Finally we include a demonstration of how, in principle, our atom interferometer could be used to make precision measurements of the Talbot time along with some of the necessary steps to bring it in line with current leading measurements.
dc.language.isoen
dc.publisherUniversity of Otago
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dc.subjectAtom interferometry
dc.subjectPrecision measurement
dc.subjectTalbot-Lau
dc.subjectTalbot effect
dc.titleAtom Interferometry Using Near Resonant Standing Waves of Light
dc.typeThesis
dc.date.updated2014-10-30T03:52:17Z
dc.language.rfc3066en
thesis.degree.disciplinePhysics
thesis.degree.nameDoctor of Philosophy
thesis.degree.grantorUniversity of Otago
thesis.degree.levelDoctoral
otago.interloanno
otago.openaccessAbstract Only
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