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Overtone generation in driven coherent media
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. (Photonics and microwave technology)
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. (Photonics and microwave technology)
2009 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 79, no 6, 063832-1-063832-7 p.Article in journal (Refereed) Published
Abstract [en]

We observe overtone signal generation of a near-resonant bichromatic light field interacting with 85Rb on the Zeeman split F=2F=1,2,3 hyperfine transitions of the D2 line at 780 nm. A nonperturbative theoretical model for electromagnetically induced transparency is developed in order to explain this phenomenon. Assuming a  system, an explicit and convenient expression for the atomic coherence is derived from the Lindblad equation assuming a phase-damping channel. The light field state is parametrically varied through one beat note of the bichromatic field and the spatial properties are studied by numerically solving the coupled-wave equation. The polarization characteristics is analyzed on the Poincaré sphere, which together with field intensity analysis offers a simple explanation of the harmonic beating signal due to Stokes vector rotation around the Poincaré sphere and decoherence effects. The experimental data and theoretical analysis focus on the first and second harmonics, although many higher harmonics are present. A distinct and narrow minimum of the second-harmonic generation is measured on two-photon resonance.

Place, publisher, year, edition, pages
2009. Vol. 79, no 6, 063832-1-063832-7 p.
Keyword [en]
light-matter coherence, overtone generation
National Category
Physical Sciences Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-11223DOI: 10.1103/PhysRevA.79.063832ISI: 000267700100182Scopus ID: 2-s2.0-67649382253OAI: oai:DiVA.org:kth-11223DiVA: diva2:242265
Note
QC 20100927Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2017-12-13Bibliographically 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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