Controlling attosecond transient absorption with tunable, non-commensurate light fields

Optics Letters
Nathan HarkemaArvinder Sandhu

Abstract

We demonstrate a transient absorption scheme that uses a fixed-spectrum attosecond pulse train in conjunction with a tunable probe laser to access a wide range of nonlinear light-atom interactions. We exhibit control over the time-dependent Autler-Townes splitting of the 1s4p absorption line in helium, and study its evolution from a resonant doublet to a light-induced sideband with changing probe wavelength. The non-commensurate probe also allows for the background-free study of two-infrared-photon emission processes in a collinear geometry. Using this capability, we observe two different emission pathways with non-trivial delay dependencies, one prompt and the other delayed. We identify the nonlinear processes underlying these emissions by comparing the experimental results to calculations based on the time-dependent Schrödinger equation.

References

Aug 7, 2007·Physical Review Letters·Christian ButhLinda Young
Aug 6, 2010·Nature·Eleftherios GoulielmakisFerenc Krausz
Jan 15, 2011·Physical Review Letters·He WangZenghu Chang
Apr 27, 2011·Physical Review Letters·M HollerU Keller

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Citations

Jul 24, 2021·Physical Review Letters·N HarkemaA Sandhu

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