Universidad Complutense de Madrid
E-Prints Complutense

Superluminal and slow light in Lambda-type three-level atoms via squeezed vacuum and spontaneously generated coherence

Impacto

Downloads

Downloads per month over past year

Carreño Sánchez, Fernando and Gómez Calderón, Óscar and Antón Revilla, Miguel Ángel and Gonzalo Fonrodona, Isabel (2005) Superluminal and slow light in Lambda-type three-level atoms via squeezed vacuum and spontaneously generated coherence. Physical review A, 71 (6). 063805/1-063805/11. ISSN 1050-2947

[img]
Preview
PDF
149kB

Official URL: http://dx.doi.org/10.1103/PhysRevA.71.063805


URLURL Type
http://journals.aps.org/Publisher


Abstract

We study the dispersion and absorption spectra of a weak probe in a Delta-type three-level atomic system with closely ground sublevels driven by a strong field and damped by a broadband squeezed vacuum. We analyze the interplay between the spontaneous generated coherence and the squeezed field on the susceptibility of the atomic system. We find that by varying the intensity of the squeezed field the group velocity of a weak pulse can change from subluminal to superluminal. In addition we exploit the fact that the properties of the atomic medium can be dramatically modified by controlling the relative phase between the driving field and the squeezed field, allowing us to manipulate the group velocity at which light propagates. The physical origin of this phenomenon corresponds to a transfer of the atomic coherence from electromagnetically induced transparency to electromagnetically induced absorption. Besides, this phenomenon is achieved under nearly transparency conditions and with negligible distortion of the propagation pulse.


Item Type:Article
Additional Information:

©2005 The American Physical Society. This work was supported by Project Nos. PR3/04-12458 (U.C.M., Spain) and FIS2004-03267 (M.E.C, Spain).

Uncontrolled Keywords:Level atom; Anomalous-dispersion; Propagation; System; Inversion; Field; Gain; Transparency; Transitions; Refraction
Subjects:Sciences > Physics > Optics
ID Code:29838
Deposited On:28 Apr 2015 14:55
Last Modified:28 Apr 2015 14:55

Origin of downloads

Repository Staff Only: item control page