Abstract
We demonstrate Rabi oscillations in nonlinear ionization of argon by an intense femtosecond extreme ultraviolet (XUV) laser field produced by high-harmonic generation. We monitor the formation of as a function of the time delay between the XUV pulse and an additional near-infrared (NIR) femtosecond laser pulse, and show that the population of an intermediate resonance exhibits strong modulations both due to an NIR laser-induced Stark shift and XUV-induced Rabi cycling between the ground state of and the excited state. Our experiment represents a direct experimental observation of a Rabi-cycling process in the XUV regime.
- Received 4 March 2016
DOI:https://doi.org/10.1103/PhysRevA.95.021401
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