Coherent interactions of light with atomic ensembles have been extensively studied in various electronic level configurations, such as Λ, ladder, V, double–Λ and N [1]. Recently it has been suggested [2] that a double-V configuration may provide robust quantum superposition states in closed-loop multilevel system which results in several quantum interference phenomena.

In this presentation we demonstrate an experimental realization of a closed double-V configuration using D1 transition in ⁸⁷Rb vapor. We investigate four-wave-mixing (FWM) in this system and show that as predicted we can get a whole scale of atomic phenomena including electromagnetically induced transparency (EIT), electromagnetically induced absorption (EIA), parametric generation, and huge enhancement of refractive index accompanied with negligible absorption. Furthermore we show that the transition between the different processes can be controlled by selecting the frequency detuning from the atomic resonance.

[1] M. D. Lukin, P.R. Hemmer and M.O. Scully, Advances in Atomic, Molecular And Optical Physics, 42,347 (2000)

[2] A. Kani and H. Wanare, Opt. Exp., 22, 15305 (2014)