Abstract
Attosecond time-resolved transient absorption spectroscopy is performed in a dense helium target by superimposing an attosecond pulse train (APT) with a moderately strong infrared field. We observe rapid oscillations of the absorption of the individual harmonics as a function of time-delay between the APT and IR field even for harmonic energies well below the ionization threshold. The phase dependence of these modulations on atto-chirp and IR intensity yields direct evidence for the interference of transiently bound electronic wavepackets as the underlying mechanism.
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Acknowledgements
This research was supported by the NCCR Quantum Photonics (NCCR QP), a research instrument of the Swiss National Science Foundation (SNSF).
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Gallmann, L., Holler, M., Schapper, F., Keller, U. (2012). Electron Wavepacket Interference Observed by Attosecond Transient Absorption Spectroscopy. In: Yamanouchi, K., Katsumi, M. (eds) Multiphoton Processes and Attosecond Physics. Springer Proceedings in Physics, vol 125. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-28948-4_33
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DOI: https://doi.org/10.1007/978-3-642-28948-4_33
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