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 article, the competition and transfer between atomic coherence and electromagnetically induced population grating of multi-wave mixing (MWM) in four-and five-level atomic systems were studied.
Abstract: We study the competition and transfer between atomic coherence and electromagnetically induced population grating of multi-wave mixing (MWM) in four- and five-level atomic systems. The MWM signal falls into a new type electromagnetically induced transparency (EIT) window that depends on propagating directions of the related fields rather than atomic system configuration. By blocking different coupling laser beams, we experimentally distinguish different wave mixing processes. In addition, by changing the detuning of pump beams, we can observe double peaks for both EIT and MWM signals. The results may have potential applications in correlated photon-pair generations in four-wave mixing as well as six-wave mixing and quantum information processing.
01 Jan 1993
TL;DR: In this article, a simple scheme demonstrating lasing without inversion (LWI) within the Na D1 line is presented and analyzed within the hyperfine manifolds of the 3 2P1/2 and 3 2S 1/2 states.
Abstract: We present and analyze a simple scheme demonstrating lasing without inversion (LWI) within the Na D1 line, i.e., within the hyperfine manifolds of the 3 2P1/2 and 3 2S1/2 states.
14 Jun 2009
TL;DR: In this paper, the Trapped Rainbow method for stopping light is shown to be resilient to the presence of material losses, i.e. even with high material losses there are still guided electromagnetic modes, characterised by a real propagation constant and complex frequency which can assume a zero group velocity and be excited in a time domain experiment.
Abstract: It has recently been theoretically demonstrated that guided electromagnetic waves propagating along an adiabatically tapered negative-refractive-index metamaterial (MM) heterostructure can be considerably slowed down and stored by the Trapped-Rainbow method [1]. Here, we shall explain that, in principle, this method simultaneously allows 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. By nature, the presented scheme invokes solid-state materials and, as such, is not subject to low-temperature or atomic coherence limitations. A wave analysis, which demonstrates the halting of a monochromatic field component travelling along the heterostructure, is followed by a pertinent ray analysis, which unmistakably illustrates the trapping of the associated light-ray and the formation of a double light-ray cone (‘optical clepsydra’) at the point where the ray is trapped. We shall explain that this method for stopping light is resilient to the presence of material losses, i.e. even in the presence of high material losses there are still guided electromagnetic modes, characterised by a real propagation constant and complex frequency which can assume a zero group velocity and be excited in a time-domain experiment.
TL;DR: In this paper, the effects of atomic coherence and classical field on the chaotic dynamics of a two-photon laser were numerically studied and it was shown that the Lorenz chaos and hyperchaos can be induced or inhibited by the atomic co-herence and the classical field via crisis or Hopf bifurcations.
Abstract: Based on the cascade two-photon laser dynamic equation derived with the technique of quantum Langevin operators with the considerations of coherently prepared three-level atoms and the classical field injected into the cavity, we numerically study the effects of atomic coherence and classical field on the chaotic dynamics of a two-photon laser. Lyapunov exponent and bifurcation diagram calculations show that the Lorenz chaos and hyperchaos can be induced or inhibited by the atomic coherence and the classical field via crisis or Hopf bifurcations.
10 Jul 2006
TL;DR: In this article, the authors show that the bandwidth for a conventional atomic vapour absorption frequency reference is limited by the atomic lifetime, and propose higher bandwidth frequency discrimination using atomic coherence mechanisms.
Abstract: We show that the bandwidth for a conventional atomic vapour absorption frequency reference is limited by the atomic lifetime, and propose higher bandwidth frequency discrimination using atomic coherence mechanisms.