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Quantum Electronics and Laser Science Conference

Laser-noise-induced correlations in electromagnetically induced transparency

Paulo Valente, Luciano Soares da Cruz, D. Felinto, K. N. Cassemiro, M. Martinelli, J. G. Aguirre Gómez, A. Lezama, P. Nussenzveig

Published May 1, 2007• 0 citations
Publisher

Abstract

We observed a change from correlation to anti-correlation between pump and probe fields in Electromagnetic Induced Transparency (EIT) in 85Rb vapor, and explain it by competition between EIT and Raman processes.
DOI
10.1109/qels.2007.4431587

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We have experimentally studied electromagnetically induced transparency (EIT) and absorption (EIA) in hot 85Rb atomic vapor using probe and coupling light with comparable power levels. We have shown that strong-probe EIT has different linewidth and appears in fewer configurations than does usual, weak probe EIT. In V-scheme, where optical pumping and saturation are dominant mechanisms, narrow EIT is possible only when a probe is tuned to a closed transition. The width of the EIT resonance increases with laser intensity with non-linear dependence, similar to the weak-probe EIT in Lambda- scheme. The EIT in Lambda- scheme was observed when two transitions had balanced population losses. The EIA was modified for the case of a strong probe as well: in four-level N-scheme with Zeeman sublevels the EIA was observed only for a cycling transition when F'=F+1, where F and F' are the angular momenta of the 5 2S1/2 (ground) and 5 2P3/2 (excited) state hyper-fine levels, respectively. The combination of strong probe and strong coupling laser beam intensities allows observation of an absorption dip due to three-photon resonance in a four-level scheme that involves the Raman transitions via virtual level.