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Manipulating light pulses during storage and readout
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
(English)Manuscript (preprint) (Other academic)
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-24066OAI: oai:DiVA.org:kth-24066DiVA: diva2:343107
Note
QC 20100812Available from: 2010-08-12 Created: 2010-08-12 Last updated: 2010-08-12Bibliographically approved
In thesis
1. Slow and stopped light by light-matter coherence control
Open this publication in new window or tab >>Slow and stopped light by light-matter coherence control
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis we study light-matter coherence phenomena related to the interaction of a coherent laser field and the so-called Λ-system, a three-level quantum system (e.g., an atom). We observe electromagnetically induced transparency (EIT), slow and stored light in hot rubidium vapor. For example, a 6 μs Gaussian pulse propagate at a velocity of ~1 km/s (to be compared with the normal velocity of 300 000 km/s). Dynamic changes of the control parameter allows us to slow down a pulse to a complete stop, store it for ~100 μs, and then release it. During the storage time, and also during the release process, some properties of the light pulse can be changed, e.g., frequency chirping of the pulse is obtained by means of Zeeman shifting the energy levels of the Λ-system. If, bichromatic continuous light fields are applied we observe overtone generation in the beating signal, and a narrow `dip' in overtone generation efficiency on two-photon resonance, narrower than the `coherent population trapping' transparency. The observed light-matter coherence phenomena are explained theoretically from first principles, using the Lindblad master equation, in conjunction with the Maxwell's equations. Furthermore, we analyze an optical delay-line based on EIT and show that there is in principle (besides decoherence) no fundamental limitation, but the usefulness today is scant. The combination of EIT and a photonic crystal cavity is inquired into, and we show that the quality value of a small resonator (area of 2.5λ×2.5λ with a missing central rod) can be enhanced by a factor of 500 due to the increased modal density close to two-photon resonance. Open system effects (decoherence effects) are thoroughly investigated using a coherence vector formalism, furthermore, a vector form of the Lindblad equation is derived. Specifically we find an open system channel that lead to slow light and gain.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xii, 105 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2009:09
Keyword
slow light, stored light, stopped light, light-matter coherence, electromagnetically induced transparency, rubidium atoms
National Category
Physical Sciences Telecommunications
Identifiers
urn:nbn:se:kth:diva-11212 (URN)978-91-7415-429-0 (ISBN)
Public defence
2009-10-29, C1, Electrum, Isafjordsgatan 22, Kista, 13:15 (English)
Opponent
Supervisors
Note
QC 20100812Available from: 2009-10-07 Created: 2009-10-06 Last updated: 2012-03-27Bibliographically approved

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Citation style
  • apa
  • harvard1
  • ieee
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  • vancouver
  • Other style
More styles
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Output format
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