Strong-field effects in Rabi oscillations between a single state and a superposition of states

Details Strong-field effects in Rabi oscillations between a single state and a superposition of states Strong-field effects in Rabi oscillations between a single state and a superposition of states

2011-09-22

arxiv.org/abs/1109.4689v1

Physics

Quantum Physics

6 pages, 6 figures

Scientific paper

Rabi oscillations of quantum population are known to occur in two-level systems driven by spectrally narrow laser fields. In this work we study Rabi oscillations induced by shaped broadband femtosecond laser pulses. Due to the broad spectral width of the driving field, the oscillations are initiated between a ground state and a coherent superposition of excited states, or a "wavepacket", rather than a single excited state. Our experiments reveal an intricate dependence of the wavepacket phase on the intensity of laser field. We confirm numerically that the effect is associated with the strong-field nature of the interaction, and provide a qualitative picture by invoking a simple theoretical model.

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