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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 20 — Sep. 26, 2011
  • pp: 19430–19439

Valley in the efficiency of the high-order harmonic yield at ultra-high laser intensities

J. A. Pérez-Hernández, L. Roso, A. Zaïr, and L. Plaja  »View Author Affiliations

Optics Express, Vol. 19, Issue 20, pp. 19430-19439 (2011)

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We study the process of high-order harmonic generation using laser pulses with non-adiabatic turn-on and intensities well above saturation. As a main point, we report the existence of a valley structure in the efficiency of single-atom high-order harmonic generation with increasing laser intensities. Consequently, after an initial decrease, the high-frequency radiation yield is shown to increase for higher intensities, returning to a level similar to the case below saturation. Such behavior contradicts the general belief of a progressive degradation of the harmonic emission at ultrahigh intensities, based on the experience with pulses with smoother turn-on. We shall show that this behavior corresponds to the emergence of a new pathway for high-order harmonic generation, which takes place during the pulse turn-on. Our study combines trajectory analysis, wavelet techniques and the numerical integration of 3-Dimensional Time Dependent Schrödinger Equation. The increase in efficiency raises the possibility of employing ultrahigh intensities to generate high-frequency radiation beyond the water window.

© 2011 OSA

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(190.4180) Nonlinear optics : Multiphoton processes
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.5540) Ultrafast optics : Pulse shaping
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
(020.2649) Atomic and molecular physics : Strong field laser physics

ToC Category:
Atomic and Molecular Physics

Original Manuscript: June 28, 2011
Revised Manuscript: July 28, 2011
Manuscript Accepted: July 28, 2011
Published: September 22, 2011

J. A. Pérez-Hernández, L. Roso, A. Zaïr, and L. Plaja, "Valley in the efficiency of the high-order harmonic yield at ultra-high laser intensities," Opt. Express 19, 19430-19439 (2011)

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