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

被引：46

作者：

Katalin Kovacs ^{[1
,2
]}

Emeric Balogh ^{[1
]}

Janos Hebling ^{[3
]}

Tosa, Valer ^{[2
]}

Katalin Varju ^{[1
]}

机构：

[1] Univ Szeged, Dept Opt & Quantum Elect, HU-6720 Szeged, Hungary

[2] Natl Inst R&D Isotop & Mol Technol, RO-400293 Cluj Napoca, Romania

[3] Univ Pecs, Dept Expt Phys, HU-7624 Pecs, Hungary

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 19期

关键词：

COUNTERPROPAGATING LIGHT; OPTICAL RECTIFICATION; GENERATION; FIELD;

D O I：

10.1103/PhysRevLett.108.193903

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

共 24 条

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