UV-laser-induced contamination: a parametric study of deposit morphology

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

doi:10.1117/12.2538961

20 November 2019 UV-laser-induced contamination: a parametric study of deposit morphology

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

Proceedings Volume 11173, Laser-induced Damage in Optical Materials 2019; 111731F (2019) https://doi.org/10.1117/12.2538961
Event: SPIE Laser Damage, 2019, Broomfield (Boulder area), Colorado, United States

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.

Conference Presentation

Citation Download Citation

Frank R. Wagner, Georges Gebrayel El Reaidy, Delphine Faye, and Jean-Yves Natoli "UV-laser-induced contamination: a parametric study of deposit morphology", Proc. SPIE 11173, Laser-induced Damage in Optical Materials 2019, 111731F (20 November 2019); https://doi.org/10.1117/12.2538961

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