Alkali-metal atoms in laser fields: optical pumping, coherent population trapping, and laser cooling

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Lindvall, Thomas 2012-08-29T09:46:16Z 2012-08-29T09:46:16Z 2010
dc.identifier.isbn 978-952-60-3502-4 (PDF)
dc.identifier.isbn 978-952-60-3501-7 (printed) #8195;
dc.identifier.issn 1795-4584
dc.description.abstract Alkali metals have played an important role in optical and atomic physics from the very beginning. This thesis deals with three aspects and applications of alkali-metal atoms, in particular rubidium (Rb). Optical pumping changes both the amplitudes and the center positions of the absorption profiles in the Doppler-broadened D-line spectra of the alkali-metal atoms. This effect has been studied by reducing the multilevel system to an effective three-level system and by treating the finite interaction time and collisions with the vapor-cell walls in two different ways: as ground-state relaxation and by averaging the time-dependent absorption over the distribution of interaction times. The former is a computationally efficient way to compare theoretical spectra to experimental results, and the latter reveals lineshape details that are due to the coupling between the Doppler shift and the interaction times through the longitudinal velocity of the atoms. Using coherent population trapping (CPT) in 85Rb, an all-optical atomic clock has been realized. The good noise properties of the diode laser, an optimized buffer gas, and a very low light intensity allow detection of ultranarrow CPT resonances < 20 Hz, apparently the narrowest optically induced hyperfine CPT resonance ever measured. The Q value of this resonance, 1.5 × 108, is comparable to Q values in cesium clocks and the stability of the CPT clock is sufficient for many high-precision applications. Trapping of Rb atoms in microscopic magneto-optical traps (MOTs) a few hundred micrometers from the surface of an optically transparent ferrite-garnet permanent-magnet atom chip has been demonstrated. The required magnetic fields are created by magnetic patterns magneto-optically written into the ferrite-garnet film and the transparency of the chip allows using a conventional MOT geometry. The magnetic patterns can be erased and re-written in situ, even during the experiments. Magnetic traps with a trap depth up to 1 mK could be realized using this type of atom chip. en
dc.format.extent Verkkokirja (1948 KB, 68 s.)
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto-yliopiston teknillinen korkeakoulu en
dc.relation.ispartofseries TKK dissertations, 258 en
dc.relation.haspart [Publication 1]: T. Lindvall and I. Tittonen. 2007. Effect of optical pumping on alkali-atom Doppler-limited spectra. Journal of Modern Optics, volume 54, numbers 16-18, pages 2779-2793. Corrigendum. 2008. Journal of Modern Optics, volume 55, number 15, pages 2497-2500. en
dc.relation.haspart [Publication 2]: Thomas Lindvall and Ilkka Tittonen. 2009. Interaction-time-averaged optical pumping in alkali-metal-atom Doppler spectroscopy. Physical Review A, volume 80, number 3, 032505, 10 pages. © 2009 American Physical Society (APS). By permission. en
dc.relation.haspart [Publication 3]: T. Lindvall, M. Merimaa, I. Tittonen, and E. Ikonen. 2002. All-optical atomic clock based on dark states of 85Rb. In: Patrick Gill (editor). Proceedings of the 6th Symposium on Frequency Standards and Metrology (FSM 2001). Fife, Scotland, UK. 9-14 September 2001. Singapore. World Scientific Publishing Company. Pages 183-190. ISBN 981-02-4911-X. en
dc.relation.haspart [Publication 4]: Mikko Merimaa, Thomas Lindvall, Ilkka Tittonen, and Erkki Ikonen. 2003. All-optical atomic clock based on coherent population trapping in 85Rb. Journal of the Optical Society of America B, volume 20, number 2, pages 273-279. © 2003 Optical Society of America (OSA). By permission. en
dc.relation.haspart [Publication 5]: A. Shevchenko, M. Heiliö, T. Lindvall, A. Jaakkola, I. Tittonen, M. Kaivola, and T. Pfau. 2006. Trapping atoms on a transparent permanent-magnet atom chip. Physical Review A, volume 73, number 5, 051401(R), 4 pages. © 2006 American Physical Society (APS). By permission. en
dc.subject.other Physics
dc.title Alkali-metal atoms in laser fields: optical pumping, coherent population trapping, and laser cooling en
dc.type G5 Artikkeliväitöskirja fi Aalto-yliopiston teknillinen korkeakoulu fi
dc.contributor.department Mikro- ja nanotekniikan laitos fi
dc.contributor.department Department of Micro and Nanosciences en
dc.subject.keyword alkali metal en
dc.subject.keyword optical pumping en
dc.subject.keyword coherent population trapping en
dc.subject.keyword laser cooling en
dc.identifier.urn URN:ISBN:978-952-60-3502-4
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.supervisor Tittonen, Ilkka, Prof.

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