Doppler cooling with coherent trains of laser pulses and tunable "velocity comb"

Details Doppler cooling with coherent trains of laser pulses and tunable "velocity comb" Doppler cooling with coherent trains of laser pulses and tunable "velocity comb"

2011-05-03

arxiv.org/abs/1105.0665v3

Physics

Atomic Physics

Scientific paper

We explore the possibility of decelerating and Doppler cooling of an ensemble of two-level atoms by a coherent train of short, non-overlapping laser pulses. We develop a simple analytical model for dynamics of a two-level system driven by the resulting frequency comb field. We find that the effective scattering force mimics the underlying frequency comb structure. The force pattern depends strongly on the ratio of the atomic lifetime to the repetition time and pulse area. For example, in the limit of short lifetimes, the frequency peaks of the optical force wash out. We show that laser cooling with pulse trains results in a "velocity comb", a series of narrow peaks in the velocity space.

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