Abstract

We demonstrate the preparation and probing of the coherence between the hyperfine ground states $\mid 5S_{1∕2},F=1⟩$ and $\mid 5S_{1∕2},F=2⟩$ of the ${}^{87}\mathrm{Rb}$ isotope. The effects of various coherence control techniques, i.e., fractional stimulated Raman adiabatic passage and coherent population return, on the coherence are investigated. These techniques are implemented using nearly degenerate pump and Stokes lasers at $795\mathrm{nm}$ (Rb $D1$ transition), which couple the two hyperfine ground states via the excited state $\mid 5P_{1∕2},F=1⟩$ through a resonant two-photon process in which a coherent superposition of the two hyperfine ground states is established. The medium is probed by an additional weak laser, which generates a four-wave mixing signal proportional to the ground state coherence and allows us to monitor its evolution in time. The experimental data are compared with numerical simulations.

© 2007 Optical Society of America

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