| Autor: |
Kovács, Katalin, Balogh, Emeric, Hebling, János, Tosa, Valer, Varjú, Katalin |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. Lett. 108, 193903 (2012) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.108.193903 |
| Popis: |
High-order harmonic generation in the presence of a chirped THz pulse is investigated numerically with a complete 3D non-adiabatic model. The assisting THz pulse illuminates the HHG 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 two orders of magnitude increase in the harmonic efficiency of cutoff harmonics ($\approx$170 eV) using a THz pulse of constant wavelength, and a further factor of 3 enhancement when a chirped THz pulse is used. |
| Databáze: |
arXiv |
| Externí odkaz: |
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