Conversion between electromagnetically induced transparency and absorption in a lambda system

Details Conversion between electromagnetically induced transparency and absorption in a lambda system Conversion between electromagnetically induced transparency and absorption in a lambda system

2011-02-02

arxiv.org/abs/1102.0364v1

Physics

Optics

4 pages, 5 figures

Scientific paper

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 the same three-level $\Lambda$ 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 sublevel structure, but can also be understood qualitatively from the effects of optical pumping.

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