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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 6 — Mar. 20, 2006
  • pp: 2242–2249

Frequency chirp of long electron quantum paths in high-order harmonic generation

E. Benedetti, J-P. Caumes, G. Sansone, S. Stagira, C. Vozzi, and M. Nisoli  »View Author Affiliations

Optics Express, Vol. 14, Issue 6, pp. 2242-2249 (2006)

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We report on the first experimental measurement of the spectral broadening of the harmonic emission associated with only the long electron quantum paths as a function of the driving pulse intensity. For such measurements we have estimated the chirp coefficient associated with the long quantum paths, within the strong-field approximation. This coefficient describes how the harmonic phase depends on the intensity of the driving laser field. The dependence of the chirp coefficient on the driving pulse intensity and on the harmonic order, which strongly influence the characteristics of the harmonic radiation, has been experimentally investigated. The experimental values turn out to be in excellent agreement with the results of numerical simulations based on the use of the nonadiabatic saddle-point method.

© 2006 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

Original Manuscript: February 3, 2006
Revised Manuscript: March 13, 2006
Manuscript Accepted: March 14, 2006
Published: March 20, 2006

Enrico Benedetti, Jean-Pascal Caumes, Giuseppe Sansone, Salvatore Stagira, Caterina Vozzi, and Mauro Nisoli, "Frequency chirp of long electron quantum paths in high-order harmonic generation," Opt. Express 14, 2242-2249 (2006)

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