Physical Review A

Nondegenerate four-wave mixing in rubidium vapor: The diamond configuration

F. E. Becerra, R. T. Willis, S. L. Rolston, Luis A. Orozco

Published Jul 23, 2008• 65 citations

Abstract

We investigate experimentally and theoretically nondegenerate four-wave mixing in rubidium vapor using a diamond configuration ($5{S}_{1/2}$, $5{P}_{1/2}$, $5{P}_{3/2}$, and $6{S}_{1/2}$ levels). We model this process of three classical fields interacting with a four-level atomic system with the Schr\"odinger equation. The experimental results are in good agreement with theoretical predictions for the generated light as a function of detuning.

DOI: 10.1103/physreva.78.013834

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Physical Review A

Nondegenerate four-wave mixing in rubidium vapor: The diamond configuration

F. E. Becerra, R. T. Willis, S. L. Rolston, Luis A. Orozco

Published Jul 23, 2008• 65 citations

Publisher

Abstract

We investigate experimentally and theoretically nondegenerate four-wave mixing in rubidium vapor using a diamond configuration (

5{S}_{1/2}

5{P}_{1/2}

5{P}_{3/2}

, and

6{S}_{1/2}

levels). We model this process of three classical fields interacting with a four-level atomic system with the Schr"odinger equation. The experimental results are in good agreement with theoretical predictions for the generated light as a function of detuning.

DOI: 10.1103/physreva.78.013834

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Frontiers in OpticsJan 1, 20080 citations

We investigate experimentally and theoretically nondegenerate four-wave mixing in rubidium vapor using a diamond configuration (

5{S}_{1/2}

5{P}_{1/2}

5{P}_{3/2}

, and

6{S}_{1/2}

5{S}_{1/2}

5{P}_{1/2}

5{P}_{3/2}

, and

6{S}_{1/2}

). The atomic polarization comes from all the contributions of different velocity classes of atoms in the ensemble modifying dramatically the total transient behavior of the light from FWM.

5{\phantom{\rule{0.16em}{0ex}}}^{2}{S}_{1/2},5{\phantom{\rule{0.16em}{0ex}}}^{2}{P}_{3/2},5{\phantom{\rule{0.16em}{0ex}}}^{2}{D}_{3/2}

, and

5{\phantom{\rule{0.16em}{0ex}}}^{2}{P}_{1/2}

levels of rubidium 85. Treating the multilevel atomic system as a combination of many four-level systems we are able to express the nonlinear susceptibility of a thermal ensemble in a low-intensity regime in terms of Voigt-type profiles and obtain an excellent conformity of theory and experiment within this complex system. The agreement is also satisfactory at high intensity and the analytical model correctly predicts the positions and shapes of resonances. Our results elucidate the physics of coherent interaction of light with atoms involving higher excited levels in vapors at room temperature, which is used in an increasing range of applications.