Extracting phase and amplitude modifications of laser-coupled Fano resonances

Fano line shapes observed in absorption spectra encode information on the amplitude and phase of the optical dipole response. A change in the Fano line shape, e.g., by interaction with short-pulsed laser fields, allows us to extract dynamical modifications of the amplitude and phase of the coupled e...

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Published inPhysical review letters Vol. 112; no. 10; p. 103001
Main Authors Kaldun, Andreas, Ott, Christian, Blättermann, Alexander, Laux, Martin, Meyer, Kristina, Ding, Thomas, Fischer, Andreas, Pfeifer, Thomas
Format Journal Article
LanguageEnglish
Published United States 14.03.2014
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Summary:Fano line shapes observed in absorption spectra encode information on the amplitude and phase of the optical dipole response. A change in the Fano line shape, e.g., by interaction with short-pulsed laser fields, allows us to extract dynamical modifications of the amplitude and phase of the coupled excited quantum states. We introduce and apply this physical mechanism to near-resonantly coupled doubly excited states in helium. This general approach provides a physical understanding of the laser-induced spectral shift of absorption-line maxima on a sub-laser-cycle time scale as they are ubiquitously observed in attosecond transient-absorption measurements.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.112.103001