Attosecond transient absorption in dense gases: Exploring the interplay between resonant pulse propagation and laser-induced line-shape control

Chen Ting Liao, Arvinder Singh Sandhu, Seth Camp, Kenneth J. Schafer, Mette B. Gaarde

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We investigate the evolution of extreme ultraviolet (XUV) spectral line shapes in an optically thick helium gas under near-infrared (IR) perturbation. In our experimental and theoretical work, we systematically vary the IR intensity, time-delay, gas density, and IR polarization parameters to study line-shape modifications induced by collective interactions in a regime beyond the single-atom response of a thin, dilute gas. In both experiment and theory, we find that specific features in the frequency-domain absorption profile, and their evolution with propagation distance, can be attributed to the interplay between resonant attosecond pulse propagation and IR-induced phase shifts. Our calculations show that this interplay also manifests itself in the time domain, with the IR pulse influencing the reshaping of the XUV pulse propagating in the resonant medium.

Original languageEnglish (US)
Article number033405
JournalPhysical Review A
Volume93
Issue number3
DOIs
StatePublished - Mar 4 2016
Externally publishedYes

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shape control
line shape
propagation
pulses
gases
lasers
gas density
line spectra
phase shift
time lag
helium
perturbation
polarization
profiles
atoms
interactions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Attosecond transient absorption in dense gases : Exploring the interplay between resonant pulse propagation and laser-induced line-shape control. / Liao, Chen Ting; Sandhu, Arvinder Singh; Camp, Seth; Schafer, Kenneth J.; Gaarde, Mette B.

In: Physical Review A, Vol. 93, No. 3, 033405, 04.03.2016.

Research output: Contribution to journalArticle

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