Observation of narrow Ramsey-type resonances in a caesium beam due to Zeeman coherences

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Abstract
The authors report the observation of narrow Ramsey-type fringes in a caesium beam by applying two spatially separated resonant laser fields. Zeeman coherences created by the first laser evolve in a constant magnetic field and are probed by the second laser. The fluorescence of the atoms in the probe light is recorded as a function of the magnetic field, showing a Ramsey-type interference pattern. Linewidths of the central valley of 0.5 mG are obtained when the distance between the two lasers is 34.5 cm. The influence of the thermal beam velocity distribution is discussed.