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Conversion between electromagnetically induced transparency and absorption in a three-level lambda system

Chanu, Sapam Ranjita and Pandey, Kanhaiya and Natarajan, Vasant (2012) Conversion between electromagnetically induced transparency and absorption in a three-level lambda system. In: EPL, 98 (4).

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Official URL: http://dx.doi.org/10.1209/0295-5075/98/44009

Abstract

We show that it is possible to change from a subnatural electromagnetically induced transparency (EIT) feature to a subnatural electromagnetically induced absorption (EIA) feature in a (degenerate) three-level. system. The change is effected by turning on a second control beam counter-propagating with respect to the first beam. We observe this change in the D-2 line of Rb in a room temperature vapor cell. The observations are supported by density-matrix analysis of the complete sublevel structure including the effect of Doppler averaging, but can be understood qualitatively as arising due to the formation of N-type systems with the two control beams. Since many of the applications of EIT and EIA rely on the anomalous dispersion near the resonances, this introduces a new ability to control the sign of the dispersion. Copyright (C) EPLA, 2012

Item Type: Journal Article
Additional Information: Copyright for this article belongs to EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, 6 RUE DES FRERES LUMIERE, MULHOUSE, 68200, FRANCE
Keywords: DRESSED STATES;LASER;LINEWIDTH;LIGHT
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 07 Jul 2012 03:39
Last Modified: 07 Jul 2012 03:40
URI: http://eprints.iisc.ernet.in/id/eprint/44771

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