Doppler cooling of three-level $Λ$-systems by coherent pulse trains

We explore the possibility of decelerating and Doppler cooling an ensemble of tree-level $Λ$-type atoms by a coherent train of short, non-overlapping laser pulses. We show that $Λ$-atoms can be Doppler cooled without additional repumping of the population from the intermediate ground state. We derive analytical expression for the scattering force in the quasi-steady-state regime and analyze its dependence on pulse train parameters. Based on this analysis we propose a method of choosing pulse train parameters to optimize the cooling process.

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