Doppler cooling and trapping on forbidden transitions

Details Doppler cooling and trapping on forbidden transitions Doppler cooling and trapping on forbidden transitions

2001-05-21

arxiv.org/abs/physics/0105069v1

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevLett.87.123002

Ultracold atoms at temperatures close to the recoil limit have been achieved by extending Doppler cooling to forbidden transitions. A cloud of ^40Ca atoms has been cooled and trapped to a temperature as low as 6 \mu K by operating a magneto-optical trap on the spin-forbidden intercombination transition. Quenching the long-lived excited state with an additional laser enhanced the scattering rate by a factor of 15, while a high selectivity in velocity was preserved. With this method more than 10% of pre-cooled atoms from a standard magneto-optical trap have been transferred to the ultracold trap. Monte-Carlo simulations of the cooling process are in good agreement with the experiments.

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