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UV-laser-induced contamination: a parametric study of deposit morphology
Author(s): Frank R. Wagner; Georges Gebrayel El Reaidy; Delphine Faye; Jean-Yves Natoli
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Paper Abstract

"Laser-induced contamination" is a major difficulty for high power photonics instruments in vacuum and in sealed environments. Material outgassing causes molecular contamination on the optical components where the laser irradiation causes photo-fixation and/or polymerization leading to carbonaceous deposits at the location of the laser beam. We studied the morphology of these deposits as function of several parameters of physical and chemical nature. The influence of these parameters on the crater rim height of the "donut"-type deposits are presented and lateral growth of the deposits beyond the laser beam size is observed. The observation of lateral growth beyond the laser beam size indicates an influence of thermal energy input to the deposition process. We hypothesize that this thermal energy is provided by heat conduction from the center of the crater.

Paper Details

Date Published: 20 November 2019
PDF: 5 pages
Proc. SPIE 11173, Laser-induced Damage in Optical Materials 2019, 111731F (20 November 2019); doi: 10.1117/12.2538961
Show Author Affiliations
Frank R. Wagner, Aix Marseille Univ., Ctr. Marseille, Institut Fresnel, CNRS (France)
Georges Gebrayel El Reaidy, Aix Marseille Univ., Ctr. Marseille, Institut Fresnel, CNRS (France)
Ctr. National d’Etudes Spatiales (France)
Delphine Faye, Ctr. National d'Études Spatiales (France)
Jean-Yves Natoli, Aix Marseille Univ., Ctr. Marseille, Institut Fresnel, CNRS (France)


Published in SPIE Proceedings Vol. 11173:
Laser-induced Damage in Optical Materials 2019
Christopher Wren Carr; Vitaly E. Gruzdev; Detlev Ristau; Carmen S. Menoni, Editor(s)

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