Ultrafast coherent XUV diffractive imaging at nanometer scale
type: Dataset
description: Ultrafast imaging of isolated objects with nanometric spatial resolution is a great challenge in our time. The lensless imaging techniques have shown great potential to answer this challenge. In lensless imaging, one can reconstruct sample images from their diffraction patterns with computational algorithms, which replace the conventional lens systems. Using ultrafast and coherent light sources, such as free electron laser and high order harmonics, one can investigate dynamic phenomena at the femtosecond time scale. In this thesis work, I present the lenless imaging experiments using XUV radiation provided by a laser driven high order harmonic beamline. The manuscript is composed of an introduction, a chapter of theoretical background, three chapters of main research work and a general conclusion with perspectives. The first part of this work concerns the development of the harmonic beamline to optimize the illumination condition for lensless imaging. The second part concentrates on the imaging techniques: the Coherent Diffraction Imaging (CDI), the Fourier Transform Holography (FTH) and the Holography using extended references (HERALDO). The reconstructions have achieved 78 nm spatial resolution in case of CDI and 112 nm resolution in case of HERALDO, both in single-shot regime corresponding to a temporal resolution of 20 fs. The third part presents the first physical application on the harmonic beamline using the lensless imaging. Samples with magnetic nano-domains have been studied with sub-100 nm spatial resolution, which paves the way for ultrafast magnetic dynamic studies. At the end, single-shot 3D imaging and further beamline development have been discussed.
identifier: NNT: 2012PA112361
issued: 2026-05-10T22:52:47.496740
language: en
modified: 2026-05-10T22:52:47.496744
contact point: Organization
  fn: CCSD
keyword: coherent-diffraction
keyword: diffraction-coherente
keyword: diffusion-elastique-resonante
keyword: extended-references
keyword: filtrage-modal
keyword: fourier-transform-holography
keyword: generation-dharmoniques-dordre-eleve
keyword: high-order-harmonics-generation
keyword: holographie-par-transformee-de-fourier
keyword: imagerie-sans-lentille
keyword: infoeu-reposemanticsdoctoralthesis
keyword: lensless-imaging
keyword: modal-filtering
keyword: nano-magnetisme
keyword: nanomagnetism
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: rapport-signal-sur-bruit
keyword: references-holographiques-etendues
keyword: resonant-elastic-scattering
keyword: signal-to-noise-ratio
keyword: single-shot-probing
keyword: sonde-simple-tir
keyword: source-uv-x
keyword: spectroscopie-ultrarapide
keyword: theses
keyword: ultrafast-spectroscopy
keyword: xuv-source
landing page: https://theses.hal.science/tel-00828058

Ultrafast coherent XUV diffractive imaging at nanometer scale
type: Distribution
format: HTML
issued: 2026-05-10T22:52:47.499499
modified: 2026-05-10T22:52:47.459687
access URL: https://theses.hal.science/tel-00828058

test_moissonnage_selune
type: Agent