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Theses

Miroirs interférentiels efficaces dans l’extrême ultraviolet pour la physique solaire

Jennifer Rebellato 1 
1 Laboratoire Charles Fabry / Optique XUV
LCF - Laboratoire Charles Fabry
Abstract : X-rays and extreme ultraviolet (EUV) light are emitted by excited particles in the solar corona because of its intense activity and extreme temperatures. Recent solar space telescopes in this spectral region showed increased performances thanks to the interference multilayer mirrors on-board. This thesis aims at enhancing such optical coatings, starting with an evaluation of EUV optical constant values available in the literature to select materials more accurately, and to refine optical simulations. This work allows us to introduce better simulations for an accurate calibration of the EUV Full Sun Imager aboard Solar Orbiter. Also, we show that mastering thin films deposition and optical and structural characterization techniques allowed us to develop new Al/Sc-based multilayer coatings reaching record reflectivity values above 40 nm wavelength, which is still a quite unexplored region. These thesis results pave the way for a new and highly efficient generation of solar observation instruments in the EUV, but they also have a remarkable impact in a wider scientific community in need for ever more efficient optical instrumentation in the EUV such as synchrotrons, EUV lithography, X-ray diagnostics, or even X-ray microscopy.
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Jennifer Rebellato. Miroirs interférentiels efficaces dans l’extrême ultraviolet pour la physique solaire. Optique [physics.optics]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASP059⟩. ⟨tel-03165571⟩

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