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 are determined by the transit time, are weakly dependent on the magnetic-field inhomogeneities, and are widths independent of the natural width of the optical transitions and the laser bandwidth.
© 1986 Optical Society of America
Original Manuscript: November 20, 1985
Manuscript Accepted: March 13, 1986
Published: June 1, 1986
G. Bertuccelli, N. Beverini, M. Galli, M. Inguscio, and F. Strumia, "Ramsey fringes in the nonlinear Hanle effect in a metastable atomic beam," Opt. Lett. 11, 351-353 (1986)