Focusing Properties of High-Order Harmonics

被引：26

作者：

Hoflund, Maria ^{[1
]}

Peschel, Jasper ^{[1
]}

Plach, Marius ^{[1
]}

Dacasa, Hugo ^{[1
]}

Veyrinas, Kevin ^{[2
]}

Constant, Eric ^{[3
]}

Smorenburg, Peter ^{[4
]}

Wikmark, Hampus ^{[1
]}

Maclot, Sylvain ^{[1
]}

Guo, Chen ^{[1
]}

Arnold, Cord ^{[1
]}

L'Huillier, Anne ^{[1
]}

Eng-Johnsson, Per ^{[1
]}

机构：

[1] Lund Univ, Dept Phys, POB 118, S-22100 Lund, Sweden

[2] Univ Bordeaux, Ctr Laser Intenses & Applicat CELIA, CNRS, CEA, 43 Rue P Noailles, F-33400 Talence, France

[3] Univ Lyon, Univ Claude Bernard Lyon 1, Inst Lumiere Matiere, CNRS, F-69622 Villeurbanne, France

[4] ASML Netherlands BV, ASML Res, NL-5504 DR Veldhoven, Netherlands

来源：

ULTRAFAST SCIENCE | 2021年 / 2021卷

基金：

欧洲研究理事会; 瑞典研究理事会;

关键词：

ABOVE-THRESHOLD IONIZATION; LASER-BEAM; PHYSICS;

D O I：

10.34133/2021/9797453

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

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 con fi guration with a high demagni fi cation 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 a ff ects the intensity and duration of the focused attosecond pulses.

引用

页数：8

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