Quasi-phase-matching high-harmonic radiation using chirped THz pulses

Katalin Kovács, Emeric Balogh, János Hebling, Valer Toşa, Katalin Varjú

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39 Citations (Scopus)


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 (â‰̂170eV) using a THz pulse of constant wavelength, and a further factor of 3 enhancement when a chirped THz pulse is used.

Original languageEnglish
Article number193903
JournalPhysical review letters
Issue number19
Publication statusPublished - May 8 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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