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Identifier 000352636
Title Influence of molecular weight on the UV laser ablation of polymers and related applications
Alternative Title Επίδραση του μοριακού βάρους στη UV φωτοαποδόμηση πολυμερών και σχετικές εφαρμογές
Author Σελίμης, Αλέξανδρος
Thesis advisor Γεωργίου, Σάββας
Φωτάκης, Κωνσταντίνος
Abstract In 1982 the research groups of Y. Kawamura [1] and R. Srinivasan [2], almost simultaneously, the Late Latin ablatio). In particular, it was first reported that material having thickness from 0.1 μm to several microns is removed from the polymer surface following incidence of a pulsed ultraviolet (UV) excimer laser beam (ArF-193 nm). The characteristic distinction of this phenomenon, which seemed to differentiate the interaction of UV laser pulses with polymers from that of visible (VIS) or infrared (IR) ones, was the minimal thermal damage of the substrate. The result was the etching of the solid with a geometry determined by the light beam. R. Srinivasan was the first who proposed the nowadays well established terms of laser ablation and ablation decomposition. The characteristic material removal upon laser ablation seems to take place once a well defined laser fluence - FLASER (energy per surface units) - is exceeded. The etching rate or the thickness of the removed material increases with laser fluence once the latter exceeds a certain value, namely the ablation threshold fluence (Fthr). The value of the ablation threshold depends on both the material and laser parameters and it can take values from several tens of mJ/cm2 up to values greater than 1 J/cm2. Laser ablation of polymers has proven to be an important tool for a great variety of applications being at the same time a subject of extensive scientific research. In a year after the first reports on polymer laser ablation, more scientific groups confirmed the same observations using different polymers and UV wavelengths (for instance, by Srinivasan, Yeh, Braren, Lazare, Granier and Dyer). In 1983, it was reported the potential of using laser ablation in biological tissues.
Language English
Subject Art restoration
Αποκατάσταση έργων τέχνης
Issue date 2010-01-11
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Doctoral theses
  Type of Work--Doctoral theses
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