Quantum Electronics and Laser Science Conference

Four-wave mixing in a diamond configuration: Experiments with rubidium vapor

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

Published May 1, 2007• 0 citations

Abstract

We investigate four-wave mixing in rubidium vapor using a diamond configuration that includes the 5s, 5p and 6s levels. A model that includes Doppler broadening qualitatively explains some of the observations.

DOI: 10.1109/qels.2007.4431716

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Quantum Electronics and Laser Science Conference

Four-wave mixing in a diamond configuration: Experiments with rubidium vapor

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

Published May 1, 2007• 0 citations

Publisher

Abstract

DOI: 10.1109/qels.2007.4431716

Related papers

Four-wave mixing in a diamond configuration: experiments with rubidium vapor

R. T. Willis, F. E. Becerra, Luis A. Orozco +1 more

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meetingJan 1, 20071 citation

Correlated photon pairs from FWM mixing in a diamond configuration: experiments with rubidium vapor

R. T. Willis, F. E. Becerra, Luis A. Orozco +1 more

Frontiers in OpticsJan 1, 20080 citations

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F. E. Becerra, R. T. Willis, S. L. Rolston +1 more

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We present measurements of the resonance structure for nondegenerate four-wave mixing (4WM) in the diamond configuration in a warm atomic vapor of rubidium. We show that a narrow sub-Doppler feature exists and can be understood as a result of velocity-class selection. We measure the efficiency of the 4WM process and show it to be on the order of $1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. Our observations are consistent with the results of a theoretical treatment based on the semiclassical Maxwell-Bloch equations for the system with the appropriate coupling values derived from the experimental values in Rb.We present measurements of the resonance structure for nondegenerate four-wave mixing (4WM) in the diamond configuration in a warm atomic vapor of rubidium. We show that a narrow sub-Doppler feature exists and can be understood as a result of velocity-class selection. We measure the efficiency of the 4WM process and show it to be on the order of $1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. Our observations are consistent with the results of a theoretical treatment based on the semiclassical Maxwell-Bloch equations for the system with the appropriate coupling values derived from the experimental values in Rb.

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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.

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.

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.