单波导中的相位匹配、准相位匹配和脉冲压缩以增强高次谐波产生。

Phase matching, quasi-phase matching, and pulse compression in a single waveguide for enhanced high-harmonic generation.

作者信息

Zhang Xiaoshi, Lytle Amy, Popmintchev Tenio, Paul Ariel, Wagner Nick, Murnane Margaret, Kapteyn Henry

机构信息

JILA, Department of Physics, and National Science Foundation Engineering Research Center in Extreme Ultraviolet Science and Technology, University of Colorado at Boulder and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA.

出版信息

Opt Lett. 2005 Aug 1;30(15):1971-3. doi: 10.1364/ol.30.001971.

DOI:10.1364/ol.30.001971

PMID:16092236

Abstract

We demonstrate, for the first time to our knowledge, that the efficient region of high-harmonic generation can be shifted from lower to higher photon energies by combining phase matching, quasi-phase matching, and pulse compression in a single gas-filled waveguide. An intrawaveguide pulse compression process that works through a combination of ionization-induced refraction and guiding shortens the laser pulse as it propagates through an Ar-filled waveguide. This leads to enhanced harmonic emission at high photon energies near 95 eV while it reduces emission at low photon energies near 45 eV. The waveguide geometry also mitigates ionization-induced refraction, allowing Ar gas with high effective nonlinear susceptibility to be used.

摘要

据我们所知，我们首次证明，通过在单个充气波导中结合相位匹配、准相位匹配和脉冲压缩，高次谐波产生的有效区域可以从较低光子能量转移到较高光子能量。一种通过电离诱导折射和波导相结合起作用的波导内脉冲压缩过程，在激光脉冲通过充氩波导传播时缩短了激光脉冲。这导致在95 eV附近的高光子能量处谐波发射增强，而在45 eV附近的低光子能量处发射减少。波导结构还减轻了电离诱导折射，使得能够使用具有高有效非线性磁化率的氩气。