Observing the real-time evolution of helium atoms in a strong laser field

Niranjan Shivaram, Henry Timmers, Xiao Min Tong, Arvinder Singh Sandhu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The interaction of a strong laser field with an atom significantly modifies its atomic structure. Such an atom can be modeled using the Floquet theory in which the atomic states are described by Floquet states composed of several Fourier components. We use high-order harmonics present in extreme-ultraviolet (XUV) attosecond pulse trains (APTs) to create excited states in infra-red(IR) laser dressed He atoms which are ionized by the dressing laser field itself. The quantum interference between different components of the Floquet states leads to oscillation in the ion yield as a function of XUV-IR time delay. We measure the phase of this quantum interference process through the phase of the ion yield signal which allows us to follow the evolution of the dressed atom, in real-time, as the intensity of the IR field is varied.We observe a transition from a 5p Floquet state dominated ionization to a 2p Floquet state dominated ionization with increasing IR intensity.

Original languageEnglish (US)
Title of host publicationSpringer Proceedings in Physics
PublisherSpringer Science and Business Media, LLC
Pages203-207
Number of pages5
Volume125
ISBN (Print)9783642289477
DOIs
StatePublished - 2012
Event12th International Conference on Multiphoton Processes, ICOMP 2011 and the 3rd International Conference on Attosecond Physics, ATTO 2011 - Sapporo, Hokkaido, Japan
Duration: Jul 3 2011Jul 8 2011

Other

Other12th International Conference on Multiphoton Processes, ICOMP 2011 and the 3rd International Conference on Attosecond Physics, ATTO 2011
CountryJapan
CitySapporo, Hokkaido
Period7/3/117/8/11

Fingerprint

helium atoms
lasers
atoms
interference
ionization
atomic structure
infrared lasers
ions
time lag
harmonics
oscillations
pulses
excitation
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Shivaram, N., Timmers, H., Tong, X. M., & Sandhu, A. S. (2012). Observing the real-time evolution of helium atoms in a strong laser field. In Springer Proceedings in Physics (Vol. 125, pp. 203-207). Springer Science and Business Media, LLC. https://doi.org/10.1007/978-3-642-28948-4_34

Observing the real-time evolution of helium atoms in a strong laser field. / Shivaram, Niranjan; Timmers, Henry; Tong, Xiao Min; Sandhu, Arvinder Singh.

Springer Proceedings in Physics. Vol. 125 Springer Science and Business Media, LLC, 2012. p. 203-207.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Shivaram, N, Timmers, H, Tong, XM & Sandhu, AS 2012, Observing the real-time evolution of helium atoms in a strong laser field. in Springer Proceedings in Physics. vol. 125, Springer Science and Business Media, LLC, pp. 203-207, 12th International Conference on Multiphoton Processes, ICOMP 2011 and the 3rd International Conference on Attosecond Physics, ATTO 2011, Sapporo, Hokkaido, Japan, 7/3/11. https://doi.org/10.1007/978-3-642-28948-4_34
Shivaram N, Timmers H, Tong XM, Sandhu AS. Observing the real-time evolution of helium atoms in a strong laser field. In Springer Proceedings in Physics. Vol. 125. Springer Science and Business Media, LLC. 2012. p. 203-207 https://doi.org/10.1007/978-3-642-28948-4_34
Shivaram, Niranjan ; Timmers, Henry ; Tong, Xiao Min ; Sandhu, Arvinder Singh. / Observing the real-time evolution of helium atoms in a strong laser field. Springer Proceedings in Physics. Vol. 125 Springer Science and Business Media, LLC, 2012. pp. 203-207
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