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Laser-induced contamination (LIC): anti-reflective effect of early stage deposits
Author(s): Georges Gebrayel El Reaidy; Frank R. Wagner; Delphine Faye; Jean-Yves Natoli
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Paper Abstract

In this paper, we studied the onset and further development phases of LIC deposits. A slight antireflective effect was consistently observed at the onset of the deposition process in our experimental conditions. The increase of the laser transmission signal could thus be used as a signature to predict the initiation of a LIC deposit in the absence of in situ fluorescence monitoring which is even more sensitive. Using a monochromatic microscope, we showed that the analyzed deposit behaved like an interference coating and, due to its nanometric porosity shown by atomic force microscope images, its effective refractive index can be lower than that of the substrate. Such a layer could thus have slightly antireflective properties as they are observed during the first phase of the LIC deposit evolution.

Paper Details

Date Published: 16 November 2018
PDF: 7 pages
Proc. SPIE 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference, 108051K (16 November 2018); doi: 10.1117/12.2500081
Show Author Affiliations
Georges Gebrayel El Reaidy, Aix Marseille Univ., Ctr. Marseille, Institut Fresnel, CNRS (France)
Ctr. National d'Études Spatiales (France)
Frank R. Wagner, Aix Marseille Univ., Ctr. Marseille, Institut Fresnel, CNRS (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. 10805:
Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference
Christopher Wren Carr; Gregory J. Exarhos; Vitaly E. Gruzdev; Detlev Ristau; M.J. Soileau, Editor(s)

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