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Atomic coherence

About: Atomic coherence is a research topic. Over the lifetime, 877 publications have been published within this topic receiving 29395 citations.


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Journal ArticleDOI
TL;DR: In this article, the authors reported experimental studies of electro magnetically induced transparency and enhancement of third-order optical nonlinearities in A-type atomic systems realized in 87Rb atoms cooled and confined in a magneto-optical trap.
Abstract: We report experimental studies of electro magnetically induced transparency and enhancement of third-order optical nonlinearities in A-type atomic systems realized in 87Rb atoms cooled and confined in a magneto-optical trap. We observed complete transparency of a weak probe laser in the A type Rb system with a moderate coupling field. With a third pump laser tuned to a fourth atomic state, the atomic system exhibits the interference-enhanced third-order susceptibility and only absorbs two photons, but not one photon. Our experiment demonstrates large nonlinear absorption of the weak probe laser, from which greatly enhanced Kerr nonlinearity in the Rb system is inferred.

2 citations

Journal ArticleDOI
TL;DR: In this article, three paths of photon transition are coupled with three laser fields, and the effects of the laser field coupling with two upper levels on optical bistability are discussed.
Abstract: Optical bistability(OB) and optical multistability(OM) behaviour of ladder-type four-level atom in a unidirectional ring cavity driven by three laser fields is studied. Three paths of photon transition are coupled with the laser fields. In this case, the laser field Ω B coupling with two middle levels is very important. When the Ω B is increased, optical bistability threshold significantly decreases and optical multistability appears. The effects of the laser field coupling with two upper levels on optical bistability are also discussed. Furthermore, we analyze the effects of the detuning of probe field and atomic cooperation parameter on OB and OM.

2 citations

Proceedings ArticleDOI
02 Mar 2007
TL;DR: In this paper, the authors studied experimentally and theoretically the Hanle EIA on the closed F g = 3 : F e = 4 D2 transition of 85 Rb. Atoms were excited by the laser light with different polarization, fr om linear to circular.
Abstract: We have studied experimentally and theoretically Hanle EIA on the closed F g = 3 : F e = 4 D2 transition of 85 Rb. Atoms were excited by the laser light with different polarization, fr om linear to circular. Results of the theoretical calculations of the laser transmission, based on optical Bloch equations for density matrix elements for the same atomic system, show important effects of magnetic field transverse to the laser light . We were not able to control transverse magnetic field in the experiment but the theoretical results are still applicable to our experimental data due the presence of laboratory stray magnetic field in the vicinity of the Rb cell, occurring because of imperfect magnetic shielding. Keywords: Electromagnetically induced absorption, Coherent population trapping 1. INTRODUCTION Electromagnetically induced absorption (EIA) is characterized by an increased absorption of radiation due to atomic coherence. 1 Its origin is in the spontaneous transfer of the light induced anisotropy from excited state to a ground state Zeeman sublevels. The anisotropy can be either due to atomic coherence or population difference created among degenerate Zeeman sublevels of the excited state hyperfine level when laser lights couple atomic levels such that F

2 citations

Journal ArticleDOI
TL;DR: In this article, the influence of atomic coherence effects on the statistical and spectral properties of the ion-trap laser was investigated, and various pump configurations were considered for a realistic level scheme using a Ca + ion.

2 citations

Journal ArticleDOI
TL;DR: In this article, different dressed processes of four-wave mixing (FWM) were demonstrated, as changing the powers of the probe, pump, and dressing fields, respectively, in ladder-type three-level system.
Abstract: We demonstrate different dressed processes of four-wave mixing (FWM), as changing the powers of the probe, pump, and dressing fields, respectively, in ladder-type three-level system. It is demonstrated that scanning detuning of the dressing field can lead to the direct detection of the dressing effects and the interaction between the dressing fields, compared with scanning that of the probe field. Moreover, by respectively controlling the powers of the dressing, pump, and probe fields, the enhancement and suppression of FWM signals can be switched sensitively. Meanwhile, the spatial splitting in y direction of FWM signal due to the cross-phase modulation and electromagnetically induced gratings is observed, respectively. Such nonlinear signal with switchable enhancement has potential applications in optical switching, optical communication, and quantum information processing.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235
202222
202121
202024
201923
201825