Deeply subrecoil two-dimensional Raman cooling
Abstract
We report the implementation of a two-dimensional Raman cooling scheme using sequential excitations along the orthogonal axes. Using square pulses, we have cooled a cloud of ultracold Cesium atoms down to an RMS velocity spread of 0.39(5) recoil velocity, corresponding to an effective temperature of 30 nK (0.15 Trec). This technique can be useful to improve cold atom atomic clocks, and is particularly relevant for clocks in microgravity.
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