Observation of sub-natural linewidths for cold atoms in a magneto-optic trap

Details Observation of sub-natural linewidths for cold atoms in a magneto-optic trap Observation of sub-natural linewidths for cold atoms in a magneto-optic trap

2002-04-06

arxiv.org/abs/physics/0204021v3

Europhys. Lett., 61 (1), pp. 53--59 (2003)

Physics

Atomic Physics

8 pages, 4 figures

Scientific paper

10.1209/epl/i2003-00244-6

We have studied the absorption of a weak probe beam through cold rubidium atoms in a magneto-optic trap. The absorption spectrum shows two peaks with the smaller peak having linewidth as small as 28% of the natural linewidth. The modification happens because the laser beams used for trapping also drive the atoms coherently between the ground and excited states. This creates ``dressed'' states whose energies are shifted depending on the strength of the drive. Linewidth narrowing occurs due to quantum coherence between the dressed states. The separation of the states increases with laser intensity and detuning, as expected from this model.

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