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The observation of dark-resonances in the two-electron atom barium and theirinfluence 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_1transitions 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 andrepumping transition have a common upper state. This leads to dark resonancesand hence make optical cooling less inefficient. The experimental observationscan be accurately modelled by the optical Bloch equations. Comparison withexperimental results allows us to extract relevant parameters for effectivelaser cooling of barium.

Coherent Dark Resonances in Atomic Barium