Focusing Properties of High-Order Harmonics

Maria Hoflund; Jasper Peschel; Marius Plach; Hugo Dacasa; Kévin Veyrinas; Eric Constant; Peter Smorenburg; Hampus Wikmark; Sylvain Maclot; Chen Guo; Cord Arnold; Anne L'Huillier; Per Eng-Johnsson

doi:10.34133/2021/9797453

Focusing Properties of High-Order Harmonics

doi: 10.34133/2021/9797453

a Department of Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden
b Université de Bordeaux, CNRS, CEA, Centre Laser Intenses et Applications (CELIA), 43 Rue P. Noailles, 33400 Talence, France
c Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
d ASML Research, ASML Netherlands B.V., 5504 DR Veldhoven, Netherlands

基金项目:

The authors acknowledge support from the Swedish Research Council, the European Research Council (advanced grant QPAP), the Knut and Alice Wallenberg Foundation, and the Crafoord Foundation. The research leading to these results has received funding from LASERLAB-EUROPE (grant agreement no. 654148, European Union’s Horizon 2020 research and innovation programme). S.M. acknowledges financial support from the COST Action CA18212-Molecular Dynamics in the GAS phase (MD-GAS), supported by COST (European Cooperation in Science and Technology).

详细信息

通讯作者:
Correspondence should be addressed to Maria Hoflund

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出版历程
- 收稿日期: 2021-04-29
- 修回日期: 2021-07-27
- 刊出日期: 2021-12-01

Focusing Properties of High-Order Harmonics

a Department of Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden
b Université de Bordeaux, CNRS, CEA, Centre Laser Intenses et Applications (CELIA), 43 Rue P. Noailles, 33400 Talence, France
c Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
d ASML Research, ASML Netherlands B.V., 5504 DR Veldhoven, Netherlands

Funds:

摘要

摘要: Many applications of the extreme ultraviolet (XUV) radiation obtained by high-order harmonic generation (HHG) in gases require a small focus area in order to enable attosecond pulses to reach a high intensity. Here, high-order harmonics generated in Ar with a multiterawatt laser system in a loose focusing geometry are focused to a few micrometers using two toroidal mirrors in a Wolter configuration with a high demagnification factor. Using a knife-edge measurement technique, we determine the position and size of the XUV foci as a function of harmonic order. We show that the focus properties vary with harmonic order and the generation conditions. Simulations, based on a classical description of the harmonic dipole phase and assuming that the individual harmonics can be described as Gaussian beams, reproduce the experimental behavior. We discuss how the generation geometry affects the intensity and duration of the focused attosecond pulses.

Abstract: Many applications of the extreme ultraviolet (XUV) radiation obtained by high-order harmonic generation (HHG) in gases require a small focus area in order to enable attosecond pulses to reach a high intensity. Here, high-order harmonics generated in Ar with a multiterawatt laser system in a loose focusing geometry are focused to a few micrometers using two toroidal mirrors in a Wolter configuration with a high demagnification factor. Using a knife-edge measurement technique, we determine the position and size of the XUV foci as a function of harmonic order. We show that the focus properties vary with harmonic order and the generation conditions. Simulations, based on a classical description of the harmonic dipole phase and assuming that the individual harmonics can be described as Gaussian beams, reproduce the experimental behavior. We discuss how the generation geometry affects the intensity and duration of the focused attosecond pulses.