Topic
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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TL;DR: In this paper, a three-level Λ system is driven by two independent phase-modulated fields, and subharmonic spectral features are shown to arise at integer combinations of the modulation frequencies.
Abstract: We demonstrate new subharmonic features that arise in the strong modulation regime when a three-level Λ system is driven by two independent phase-modulated fields. In the strong modulation regime the system exhibits subharmonic spectral features even under weak-field excitation conditions, and the peaks occur precisely at integer combinations of the modulation frequencies. The spectral technique we use, apart from being nonperturbative, systematically accounts for the hierarchy of Fourier components underlying the wave-mixing phenomena. We also identify the dominant Fourier components responsible for individual peaks of the subharmonic signal. Under symmetric excitation one obtains multicoloured coherent population trapping with the associated atomic coherence. The magnitude of the multicoloured atomic coherence is invariably lower than the usual monochromatic case, and it is shared across a series of detunings as well as across (response) frequencies.
1 citations
TL;DR: In this article, a microscopic quantum statistical laser model, a prototype of a non-equilibrium open system, is solved regorously and the origin of the atomic coherence in the laser medium is discussed.
1 citations
13 Sep 2007
TL;DR: In this article, a wave propagation along a slowly axially varying, adiabatically tapered, negative refractive index metamaterial heterostructure is proposed for slowing and stopping/storing light.
Abstract: We introduce an efficient method for slowing and stopping/storing light, which is based on wave propagation along a
slowly axially varying, adiabatically tapered, negative refractive index metamaterial heterostructure. We analytically
show that the present method can, in principle, simultaneously allow for broad bandwidth operation (since it does not
rely on group index resonances), large delay-bandwidth products (since a wave packet can be completely stopped and
buffered indefinitely) and high, almost 100%, in/out-coupling efficiencies. Moreover, by nature, the presented scheme
invokes solid-state materials and, as such, is not subject to low-temperature or atomic coherence limitations. This method
for trapping photons conceivably opens the way to a multitude of hybrid, optoelectronic devices to be used in 'quantum
information' processing, communication networks and signal processors, and may herald a new realm of combined
metamaterials and slow light research.
1 citations
31 May 2009
TL;DR: In this paper, the photon logic gate is observed using ultra-low light, where the routing is based on atomic coherence enhanced by ultraslow light and the building block of the photon gate is photon routing phenomenon.
Abstract: Photon logic gates are observed using ultraslow light. The building block of the photon logic gate is photon routing phenomenon, where the routing is based on atomic coherence enhanced by ultraslow light.
1 citations
TL;DR: In this article, changes in structure of Rabi oscillations under the influence of atomic coherence in a coherent field are studied, and it is shown that when the atom is initially prepared in the semiclassical dressed state, the time behaviour of the probability P e ( t of finding the atom in its excited state exhibits doublets of revivals.
1 citations