Quasi-Phase-Matching High-Harmonic Radiation Using Chirped THz Pulses

Katalin Kovács, Emeric Balogh, János Hebling, Valer Toşa, and Katalin Varjú
Phys. Rev. Lett. 108, 193903 – Published 8 May 2012

Abstract

High-order harmonic generation in the presence of a chirped THz pulse is investigated numerically with a complete 3D nonadiabatic model. The assisting THz pulse illuminates the high-order harmonic generation gas cell laterally inducing quasi-phase-matching. We demonstrate that it is possible to compensate the phase mismatch during propagation and extend the macroscopic cutoff of a propagated strong IR pulse to the single-dipole cutoff. We obtain 2 orders of magnitude increase in the harmonic efficiency of cutoff harmonics (170eV) using a THz pulse of constant wavelength, and a further factor of 3 enhancement when a chirped THz pulse is used.

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  • Received 7 November 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.193903

© 2012 American Physical Society

Authors & Affiliations

Katalin Kovács1,2,*, Emeric Balogh1, János Hebling3, Valer Toşa2, and Katalin Varjú1

  • 1Department of Optics and Quantum Electronics, University of Szeged, HU-6720 Szeged, Hungary
  • 2National Institute for R&D of Isotopic and Molecular Technologies, RO-400293 Cluj-Napoca, Romania
  • 3Department of Experimental Physics, University of Pécs, HU-7624 Pécs, Hungary

  • *kkovacs@itim-cj.ro

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Vol. 108, Iss. 19 — 11 May 2012

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