J. Phys. II France 2 (1992) 621-629
Interaction of three-level atoms with stochastic fieldsM. A. Bouchene1, A. Débarre1, J.-C. Keller1, J.-L Le Gouët1, P. Tchénio1, V. Finkelstein2 and P. R. Berman2
1 Laboratoire Aimé Cotton, Bâtiment 505, 91405 Orsay Cedex, France
2 Physics Department, New York University, 4 Washington Place, New york, NY 10003, U.S.A.
(Received 30 October 1991, accepted 10 January 1992)
Three broadband laser pulses are used to drive transitions between three levels in Sr vapor. A four-wave mixing signal is monitored as a function of the delay time t12 between two of the pulses. For sufficiently strong fields, it is found that the signal, as a function of t12, can possess a dip or a spike which is narrower than the correlation time of the radiation fields. A theoretical interpretation of the results is presented in terms of the so-called dark resonance.
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