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Low-Speed and Suspended Propagation of Light Pulses in Atomic Medium with Electromagnetically Induced Transparency

100%
Dziczek D., Ziętek B., Chwirot S.
Acta Physica Polonica A
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2004
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vol. 106
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issue 1
13-23
EN
Experiments on hot rubidium vapor as an atomic medium with electromagnetically induced transparency for radiation of 795 nm wavelength (D1 absorption line of rubidium) are reported. Propagation of light pulses with velocity reduced to 11.5 km/s has been observed with a significant modification of the shape of square input pulses to adapt to the spectral window of induced transparency. So-called light storage, i.e. suspension of the propagation of light pulses in the medium by temporary turn-off of the electromagnetically induced transparency state was also demonstrated. "Storage" periods of several microseconds, limited by relatively fast relaxation of atomic spin polarization in the volume of interaction of atoms with radiation, were obtained.
2
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Stark-Chirped Rapid Adiabatic Passage in a Multilevel Atom

100%
Radonjić M., Jelenković B.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
476-478
EN
We generalize Stark-chirped rapid adiabatic passage to the case of a multilevel atom. The atom is assumed to have two ground state levels g and f and an excited level e. The adiabatic passage is carried out by resonantly driving the g-e and f-e transitions with time-dependent pump and Stokes fields in the presence of strong far-off-resonant Stark field. Our formalism determines the states that participate in population transfer and is applicable to systems with arbitrary numbers of degenerate states in each level and arbitrary couplings of the g-e and f-e transitions. We give an application to adiabatic passage in Rb atom.
3
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Enhancing photocell power by noise-induced coherence

100%
Svidzinsky A. A., Dorfman K. E., Scully M. O.
Coherent Phenomena
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2012
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vol. 1
7-24
EN
We show that coherence induced by Fano interference can enhance the power produced by photovoltaic devices, e.g. photodetectors and solar cells, as compared to the same system with no coherence. No additional external energy source is necessary to create such induced coherence. In the present model, coherence generated by photocurrent increases (for optically thin cells) the flow of electrons through the load, which reduces radiative recombination and enhances cell power. We discuss two schemes in which coherence is generated between upper or lower energy levels. We also study the influence of decoherence, τa, on cell power and show that one can design a device with Fano enhancement even at relatively large decoherence rates. Finally we investigate the effect of ambient temperature Ta on the cell power in a scheme with no interference and show that for certain parameters power can be increased by increasing Ta.
4
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Classical Control of Quantized Fields: Cavity Qed and the Photon Pistol

100%
Eberly J., Law C.
Acta Physica Polonica A
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1998
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vol. 93
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issue 1
55-62
EN
By using the double-lambda configuration of energy levels and three classical fields, an atom or ion in a high-Q resonant cavity can be manipulated to create a single-mode quantum state in the cavity that is an arbitrary combination of Fock states for that mode. The same principles of operation can be applied to a cavity with much lower Q in order to produce a "photon pistol", a device that "shoots" one and only one photon when a trigger is pulled, and emits no photons at other times.
5
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Entropy Associated with Local Stabilization of the Pulse Area in Multilevel Atomic Media

88%
Alhasan A.
Acta Physica Polonica A
|
2018
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vol. 133
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issue 5
1205-1214
EN
This paper provides an entropy analysis to resonant and short pulses propagation in four-level atomic medium. As an example, we take D_{1} transition in rubidium ^{87}Rb atoms including hyperfine structure. We show how to construct the time dependent Bloch-metric for each optical transition in the Liouville space. Furthermore, we attempt to relate local stabilization of the pulse area to the distribution of the space-entropy.
6
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Phase- and helicity-dependent effects in three-color ionization

63%
Fifirig M., Stroe M.
Open Physics
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2004
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vol. 2
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issue 2
266-276
EN
We study the two-photon ionization of the hydrogen atom from its ground state by a three-color electromagnetic field consisting of a superposition of an IR laser and two of its consecutive odd harmonics of order 2p−1 and 2p+1, withp a positive integer and constant relative phase difference. The ionization process due to the net absorption of the energy 2pħω (ω being the IR laser frequency) is considered. The influence of phase difference and helicity on the azimuthal angular distribution of the ejected photoelectrons is illustrated in the case in which the two harmonics have identical polarizations. Phase effect on the alignment of the differential ionization rate is also investigated.
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