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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19 May 2002
TL;DR: In this paper, a three-level electromagnetically induced transparency (EIT) system with an optical ring cavity was used to demonstrate that the cavity output intensity can be controlled by modulating the frequency detuning of the controlling beam.
Abstract: Summary form only given. The reduced absorption and enhanced nonlinearity in a three-level electromagnetically induced transparency (EIT) system are very important in achieving an effective all-optical switching action. The Kerr-nonlinear index of refraction of a three-level EIT medium can be greatly enhanced near resonance due to atomic coherence induced in such a system in comparison with a two-level atomic system, as we have shown by using an optical ring cavity. Both the magnitude and sign of the Kerr-nonlinear index change dramatically for different frequency detunings of the controlling (or coupling) or cavity (or probe) field. Bistability and dynamic instability occur when such a three-level /spl Lambda/-type EIT system is placed inside an optical ring cavity and the controlling and cavity input intensities to exceed certain threshold values. In this paper, we present a recent experimental demonstration of controlling the cavity output intensity by modulating the frequency detuning of the controlling beam.
TL;DR: In this article, a scheme for three-level cascade atoms to entangle various optical and mechanical modes of two coupled cavity optomechanical systems is presented. And the authors show that the larger stationary macroscopic entanglement can be obtained and reaches the maximum at the same effective detuning.
Abstract: We present a scheme for three-level cascade atoms to entangle various optical and mechanical modes of two coupled cavity optomechanical system. With the existence of atomic mediums, our study shows that the larger stationary macroscopic entanglement of distant optomechanical systems can be obtained and reaches the maximum at the same effective detuning. Furthermore, we find that it is insensitive to the cavity decay rate for the entanglement between the two distant movable mirrors, and between the mirror and the adjacent or the distant cavity mode, which compensates for the effects of the cavity dissipation.
03 Dec 2007
TL;DR: In this paper, the authors combine two lasers and three atomic states in a lambda-system to explore atomic coherence via two-dimensional imaging of electromagnetically induced transparency.
Abstract: Imaging cold atom samples provides interesting opportunities for studying not only the external atomic distribution, but also the internal atomic state, particularly for atoms prepared in a coherent state. We have previously developed techniques for off-resonant imaging of a cold atom cloud, without optical elements, computationally extracting the atomic column density map from a diffraction pattern (diffraction contrast imaging or DCI). We are now combining two lasers and three atomic states in a lambda-system to explore atomic coherence via two-dimensional imaging of electromagnetically induced transparency.
TL;DR: In this article, the phase dynamics in EIT was studied and the authors observed how the transmission decreases and recovers when the phase of the optical field changes abruptly, which can be used for the fast control of EIT.
Abstract: We have studied phase dynamics in EIT. We observed how the transmission decreases and recovers when the phase of the optical field changes abruptly. The result can be used for the fast control of EIT.
TL;DR: In this article, the photon statistics for the polarization CEL were analyzed and the possible solutions and stability of the steady state photon number were investigated. But the photon number was not analyzed for a small range of the atomic coherence parameter.