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Optics Communications

Two-photon effects in continuous-wave electromagnetically-induced transparency

Richard R. Moseley, Sara Shepherd, David J. Fulton, Bruce Sinclair, Malcolm H. Dunn

Published Aug 1, 1995• 48 citations
Publisher
DOI
10.1016/0030-4018(95)00316-z

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A theoretical and experimental investigation has been carried out into the viability of V-type, \ensuremath{\Lambda}-type, and cascade systems within rubidium for the observation of electromagnetically-induced transparency (EIT). A \ensuremath{\Lambda}-type system is also discussed where EIT is induced on a two-photon transition. Continuous-wave single-frequency titanium sapphire lasers have been employed to provide the applied optical fields. It is found that systems that have a strong coupling field resonant with the 5S1/2{\mathit{S}}_{1/2}S1/2​ ground state suffer from complicating optical pumping mechanisms that tend to mask EIT windows. It is also found that wavelength matching of the applied optical fields enhances the observation of EIT since this results in a reduced residual Doppler linewidth of the atomic system.
Using Schrodinger-Maxwell formalism, we propose and analyze a continuous-wave four-wave mixing (FWM) scheme for the generation of coherent light in a six-level atomic system based on electromagnetically dual induced transparency. We derive the corresponding explicit analytical expressions for the generated mixing field. We find that the scheme greatly enhances FWM production efficiency and is also capable of inhibiting and delaying the onset of the detrimental three-photon destructive interference by choosing the proper decay rate in the second electromagnetically induced transparency (EIT) process. In addition, such an optical process also provides possibilities for producing short-wave-length coherent radiation at low pump intensities.
Using Schr6dinger-Maxwell formalism, we propose(FWM) scheme for the generation of coherent lightand analyze a continuous-wave four-wave mixingin a six-level atomic system based on electromag-netically dual induced transparency. We derive the corresponding explicit analytical expressions for thegenerated mixing field. We find that the scheme greatly enhances FWM production efficiency and isalso capable of inhibiting and delaying the onset of the detrimental three-photon destructive interferenceby choosing the proper decay rate in the second electromagnetically induced transparency (EIT) process.In addition, such an optical process also provides possibilities for producing short-wave-length coherentradiation at low pump intensities.