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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 12 — Jun. 15, 2012
  • pp: 2211–2213

Transient absorption of attosecond pulse trains by laser-dressed helium

Shaohao Chen, Kenneth J. Schafer, and Mette B. Gaarde  »View Author Affiliations

Optics Letters, Vol. 37, Issue 12, pp. 2211-2213 (2012)

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We investigate transient absorption of high harmonics in an attosecond pulse train by laser-dressed He atoms using both single-atom and macroscopic methods. Calculations of the absorption as a function of laser wavelength and intensity reveal that the absorption probability is tied to resonant laser-dressed atomic states. We report for the first time to our knowledge a quarter-laser-cycle modulation in the absorption (mixed with the well-known half-cycle modulation). We discuss the conditions for which this high-order coupling could be observed and the role that the reshaping of the attosecond pulses in the medium plays in the timing of absorption.

© 2012 Optical Society of America

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(020.2649) Atomic and molecular physics : Strong field laser physics

ToC Category:
Ultrafast Optics

Original Manuscript: March 16, 2012
Revised Manuscript: April 12, 2012
Manuscript Accepted: April 16, 2012
Published: June 4, 2012

Shaohao Chen, Kenneth J. Schafer, and Mette B. Gaarde, "Transient absorption of attosecond pulse trains by laser-dressed helium," Opt. Lett. 37, 2211-2213 (2012)

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