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Identifier 000441197
Title High reflectivity XUV focusing system using toroidal mirrors and a hexapod robot device
Alternative Title Υψηλής ανακλαστικότητας σύστημα εστίασης XUV δέσμης με την χρήση τορροειδών κατόπτρων και εξάποδου ρομποτικού όργανου.
Author Κωνσταντάκης, Παναγιώτης Δ.
Thesis advisor Τζάλλας, Παρασκευάς
Abstract Advancements in laser science and technology enabled the development of ultra-short laser pulses and the production of XUV isolated and train of pulses. These scientific and technological breakthroughs lead to the investigation of ultrafast phenomena and strong-field physics, including non-linear phenomena between laser pulses and atoms. Multiphoton ionization as a non-linear phenomenon requires high laser pulse intensity to be observed. Short-pulse duration, coupled with high energy per pulse (μj order) and an appropriate focusing element is the perfect combination for achieving high intensities (above 10^12 W/cm^2) for multiphoton ionization, which is essential for pump-probe studies on the XUV regime. However, focusing XUV radiation is not trivial, due to the radiation’s high absorption in commonly used optical materials. This leads to totally avoiding refractive optics, and using reflective optics to steer and focus an XUV beam. Two of the most common approaches employed on this matter are spherical gold or multilayer mirrors in nearnormal incidence. Nonetheless, limitations arise due to the angle of the radiation that strikes the spherical mirror (to avoid spherical aberrations, astigmatism and coma) and the relative low reflectivity of multilayer mirrors for broadband range radiation. Another solution to this problem is the choice of a pair of gold-coated toroidal mirrors, used in near grazing incidence which can focus the XUV beam and minimize the aberrations. This thesis contains the procedure of the development and characterization of an experimental setup that uses a pair of toroidal mirrors mounted on a hexapod robot device to focus a IR beam and a XUV beam. Our goal was to find the optimum, experimental parameters for achieving the minimum spot size (with minimum aberrations) for an IR beam. It also contains simulations of the setup using Zemax, combining methods of ray tracing and physical optics.
Language English
Subject Attosecond
Υπεριώδης ακτινοβολία
Issue date 2021-07-28
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
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