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

Hugo Dacasa (1, 2) , Hélène Coudert-Alteirac (2) , Chen Guo (2) , Emma Kueny (2) , Filippo Campi (2) , Jan Lahl (2) , Jasper Peschel (2) , Hampus Wikmark (3) , Balázs Major (4) , Erik Malm (2) , Domenico Alj (3, 1) , Katalin Varjú (4) , Cord L. Arnold (2) , Guillaume Dovillaire (5) , Per Johnsson (2) , Anne L’huillier (2) , Sylvain Maclot (2) , Piotr Rudawski (2) , Philippe Zeitoun (1)

1 LOA - Laboratoire d'optique appliquée
2 Department of Physics
3 Imagine Optic
4 ELI ALPS - ELI
5 Imagine Optic

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 lambda/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). (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Mots clés: SOFT X-RAYS; RADIATION; NM; OPTIMIZATION; GENERATION; INTENSITY; GAS

Domaines: Optique [physics.optics]

Hugo Dacasa, Hélène Coudert-Alteirac, Chen Guo, Emma Kueny, Filippo Campi, et al.. Single-shot extreme-ultraviolet wavefront measurements of high-order harmonics. Optics Express, 2019, 27 (3), pp.2656-2670. ⟨10.1364/OE.27.002656⟩. ⟨hal-02057133⟩