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Recoil-Limited Laser Cooling of [Formula presented] Atoms near the Fermi Temperature

Takashi Mukaiyama

Published Jan 1, 2003• 0 citations
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A dynamic magneto-optical trap, which relies on the rapid randomization of population in Zeeman substates, has been demonstrated for fermionic strontium atoms on the $^{1}S_{0}\ensuremath{-}^{3}P_{1}$ intercombination transition. The obtained sample, $1\ifmmode\times\else\texttimes\fi{}{10}^{6}$ atoms at a temperature of $2\text{ }\ensuremath{\mu}\mathrm{K}$ in the trap, was further Doppler cooled and polarized in a far-off resonant optical lattice to achieve 2 times the Fermi temperature.
Conventional laser cooling relies on repeated electronic excitations by near-resonant light, which constrains its area of application to a selected number of atomic species prepared at moderate particle densities. Optical cavities with sufficiently large Purcell factors allow for laser cooling schemes, avoiding these limitations. Here, we report on an atom-cavity system, combining a Purcell factor above 40 with a cavity bandwidth below the recoil frequency associated with the kinetic energy transfer in a single photon scattering event. This lets us access a yet-unexplored regime of atom-cavity interactions, in which the atomic motion can be manipulated by targeted dissipation with sub-recoil resolution. We demonstrate cavity-induced heating of a Bose-Einstein condensate and subsequent cooling at particle densities and temperatures incompatible with conventional laser cooling.