Laser-induced contamination (LIC): anti-reflective effect of early stage deposits

Georges Gebrayel El Reaidy; Frank R. Wagner; Delphine Faye; Jean-Yves Natoli

doi:10.1117/12.2500081

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16 November 2018 Laser-induced contamination (LIC): anti-reflective effect of early stage deposits

Georges Gebrayel El Reaidy, Frank R. Wagner, Delphine Faye, Jean-Yves Natoli

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Proceedings Volume 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference; 108051K (2018) https://doi.org/10.1117/12.2500081
Event: SPIE Laser Damage, 2018, Boulder, Colorado, United States

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.

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Georges Gebrayel El Reaidy, Frank R. Wagner, Delphine Faye, and Jean-Yves Natoli "Laser-induced contamination (LIC): anti-reflective effect of early stage deposits", Proc. SPIE 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference, 108051K (16 November 2018); https://doi.org/10.1117/12.2500081

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