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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 21 — Oct. 21, 2013
  • pp: 25582–25591

Combined action of the bound-electron nonlinearity and the tunnel-ionization current in low-order harmonic generation in noble gases

Usman Sapaev, Anton Husakou, and Joachim Herrmann  »View Author Affiliations

Optics Express, Vol. 21, Issue 21, pp. 25582-25591 (2013)

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We study numerically low-order harmonic generation in noble gases pumped by intense femtosecond laser pulses in the tunneling ionization regime. We analyze the influence of the phase-mismatching on this process, caused by the generated plasma, and study in dependence on the pump intensity the origin of harmonic generation arising either from the bound-electron nonlinearity or the tunnel-ionization current. It is shown that in argon the optimum pump intensity of about 100 TW/cm2 leads to the maximum efficiency, where the main contribution to low-order harmonics originates from the bound-electron third and fifth order susceptibilities, while for intensities higher than 300 TW/cm2 the tunnel-ionization current plays the dominant role. Besides, we predict that VUV pulses at 133 nm can be generated with relatively high efficiency of about 1.5 × 10−3 by 400 nm pump pulses.

© 2013 OSA

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.7110) Nonlinear optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

Original Manuscript: August 27, 2013
Revised Manuscript: October 4, 2013
Manuscript Accepted: October 7, 2013
Published: October 18, 2013

Usman Sapaev, Anton Husakou, and Joachim Herrmann, "Combined action of the bound-electron nonlinearity and the tunnel-ionization current in low-order harmonic generation in noble gases," Opt. Express 21, 25582-25591 (2013)

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