Time-domain perspective on Autler-Townes splitting in attosecond transient absorption of laser-dressed helium atoms
We present a theoretical study of the delay-dependent Autler-Townes (AT) splitting in transient absorption spectroscopy of an isolated attosecond pulse in helium atoms subject to a delayed infrared (IR) pulse. We concentrate on cases in which the IR pulse is resonant with the helium 1s2p-1s2s transition and provide a time-domain perspective of the dynamics in the delay-dependent pump-probe system. We identify several interesting delay-dependent features in the transient absorption spectrum such as AT splitting, oscillation between absorption and emission at the resonant absorption frequency, and sub-IR-cycles oscillations. We then explain the origins of these features in the time domain in terms of a strongly driven two-level system, in the language of population transfer and coherent control. © 2013 American Physical Society.
Publication Source (Journal or Book title)
Physical Review A - Atomic, Molecular, and Optical Physics
Wu, M., Chen, S., Gaarde, M., & Schafer, K. (2013). Time-domain perspective on Autler-Townes splitting in attosecond transient absorption of laser-dressed helium atoms. Physical Review A - Atomic, Molecular, and Optical Physics, 88 (4) https://doi.org/10.1103/PhysRevA.88.043416