高次谐波的单次极端紫外线波前测量

Single-shot extreme-ultraviolet wavefront measurements of high-order harmonics.

作者信息

Dacasa Hugo, Coudert-Alteirac Hélène, Guo Chen, Kueny Emma, Campi Filippo, Lahl Jan, Peschel Jasper, Wikmark Hampus, Major Balázs, Malm Erik, Alj Domenico, Varjú Katalin, Arnold Cord L, Dovillaire Guillaume, Johnsson Per, L'Huillier Anne, Maclot Sylvain, Rudawski Piotr, Zeitoun Philippe

出版信息

Opt Express. 2019 Feb 4;27(3):2656-2670. doi: 10.1364/OE.27.002656.

DOI:10.1364/OE.27.002656

PMID:30732300

Abstract

We perform wavefront measurements of high-order harmonics using an extreme-ultraviolet (XUV) Hartmann sensor and study how their spatial properties vary with different generation parameters, such as pressure in the nonlinear medium, fundamental pulse energy and duration as well as beam size. In some conditions, excellent wavefront quality (up to λ/11) was obtained. The high throughput of the intense XUV beamline at the Lund Laser Centre allows us to perform single-shot measurements of both the full harmonic beam generated in argon and individual harmonics selected by multilayer mirrors. We theoretically analyze the relationship between the spatial properties of the fundamental and those of the generated high-order harmonics, thus gaining insight into the fundamental mechanisms involved in high-order harmonic generation (HHG).

摘要

我们使用极紫外（XUV）哈特曼传感器对高次谐波进行波前测量，并研究其空间特性如何随不同的产生参数而变化，例如非线性介质中的压力、基波脉冲能量和持续时间以及光束尺寸。在某些条件下，获得了优异的波前质量（高达λ/11）。隆德激光中心强XUV光束线的高吞吐量使我们能够对氩气中产生的全谐波光束和多层镜选择的单个谐波进行单次测量。我们从理论上分析了基波和产生的高次谐波的空间特性之间的关系，从而深入了解高次谐波产生（HHG）所涉及的基本机制。