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Low- and high-intensity velocity selective coherent population trapping in a two-level system
Umeå University, Faculty of Science and Technology, Department of Physics.
2009 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 86, no 5, 53001Article in journal (Refereed) PublishedText
Abstract [en]

An experimental investigation is made of sub-recoil cooling by velocity selective coherent population trapping in a two-level system in Sr. The experiment is carried out using the narrow linewidth intercombination line at 689 nm. Here, the ratio between the recoil shift and the linewidth is as high as 0.64. We show that, on top of a broader momentum pro. le, subrecoil features develop, whose amplitude is strongly dependent on the detuning from resonance. We attribute this structure to a velocity selective coherent population trapping mechanism. We also show that the population trapping phenomenon leads to complex momentum profiles in the case of highly saturated transitions, displaying a multitude of subrecoil features at integer multiples of the recoil momentum.

Place, publisher, year, edition, pages
EDP Sciences, 2009. Vol. 86, no 5, 53001
Keyword [en]
quantum interference, laser, transitions, atoms, limit
National Category
Physical Sciences
URN: urn:nbn:se:umu:diva-115997DOI: 10.1209/0295-5075/86/53001ISI: 000269357500013OAI: diva2:906848
Available from: 2016-02-25 Created: 2016-02-08 Last updated: 2016-02-25Bibliographically approved

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