Abstract
A pulsed metastable argon beam is transversely cooled in one dimension via the closed 4s[11/2${]}_{2}^{\mathit{o}\mathrm{\ensuremath{-}}}$4p[21/2${]}_{3}$ transition. A standing light wave, orthogonal to the atomic beam and located just at the source, provides the cooling. In all the measurements, the maximum electric field is equivalent to a Rabi frequency of \ensuremath{\sim}220 natural linewidths. The enhancement of the metastable atom flux is measured as a function of the interaction time with a time-of-flight technique. The dependence on the laser detuning is investigated and compared with theory.
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