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

Kovács, K. and Balogh, Emeric and Hebling, János and Tosa, V. and Varjú, Katalin (2012) Quasi-phase-matching high-harmonic radiation using chirped THz pulses. PHYSICAL REVIEW LETTERS, 108 (19). No.-193903. ISSN 0031-9007


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

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika > QC02 Optics / fénytan
Depositing User: Dr Katalin Varju
Date Deposited: 19 Sep 2014 13:23
Last Modified: 19 Sep 2014 13:23

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