Ramsey fringes in the nonlinear Hanle effect in a metastable atomic beam.
Evidence of coherence effects has been observed in the Zeeman sublevels by means of nonlinear level crossing in a metastable Ca beam with resonance width 3 orders of magnitude less than the radiative linewidth of the investigated transitions. By using two separate traveling waves, Ramsey-like fringes have been observed. The final measured widths are determined by the transit time, are weakly dependent on the magnetic-field inhomogeneities, and are independent of the natural width of the optical transitions and the laser bandwidth.
Bertuccelli
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Dipartimento di Fisica deli' Universitá, Piazza Torricelli 2, I-56100 Pisa, Italy.
Beverini
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Galli
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Inguscio
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Strumia
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