Superluminal and slow light in Lambda-type three-level atoms via squeezed vacuum and spontaneously generated coherence
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 th...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2005 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/51352 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/51352 |
| Access Level: | acceso abierto |
| Palabra clave: | 535 Level atom Anomalous-dispersion Propagation System Inversion Field Gain Transparency Transitions Refraction Óptica (Física) 2209.19 Óptica Física |
| Sumario: | 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. |
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