Coherent Dark Resonances in Atomic Barium

Details Coherent Dark Resonances in Atomic Barium Coherent Dark Resonances in Atomic Barium

2007-08-02

arxiv.org/abs/0708.0332v1

Physics

Atomic Physics

4 pages, 5 figures, submitted to Phys. Rev. A

Scientific paper

The observation of dark-resonances in the two-electron atom barium and their influence on optical cooling is reported. In heavy alkali earth atoms, i.e. barium or radium, optical cooling can be achieved using n^1S_0-n^1P_1 transitions and optical repumping from the low lying n^1D_2 and n^3D_{1,2} states to which the atoms decay with a high branching ratio. The cooling and repumping transition have a common upper state. This leads to dark resonances and hence make optical cooling less inefficient. The experimental observations can be accurately modelled by the optical Bloch equations. Comparison with experimental results allows us to extract relevant parameters for effective laser cooling of barium.

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