We present a method for reducing the inhomogeneous frequency broadening in the hyperfine splitting of the ground state of optically trapped atoms. This reduction is achieved by the addition of a weak light field, spatially mode matched with the trapping field and whose frequency is tuned in between the two hyperfine levels. We experimentally demonstrate the new scheme with ⁸⁵Rb atoms, and report a 50-fold narrowing of the rf spectrum.
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Kaplan et al. (2002) studied this question.
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