J. Phys. II France
Volume 2, Numéro 4, April 1992
Page(s) 621 - 629
DOI: 10.1051/jp2:1992151
J. Phys. II France 2 (1992) 621-629

Interaction of three-level atoms with stochastic fields

M. 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.

42.55 - 42.60 - 32.90

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