Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.193903
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Funding
- EU [TAMOP-4.2.1/B-09/1/KONV-2010-0005-Creating]
- European Social Fund [PN-II-RU-PD-2011-3-0236]
- ATTOFEL [ITN-2008-238362]
- Hungarian research Grant OTKA [81364]
- Bolyai Foundation
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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 (approximate to 170 eV) 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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