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Proceedings Paper • Open Access

Investigation of UV laser induced depositions on optics under space conditions in presence of outgassing materials
Author(s): Helmut Schröder; Wolfgang Riede; Hamid Kheyrandish; Denny Wernham; Yngve Lien

Paper Abstract

We have investigated the formation of UV laser induced deposits on uncoated fused silica optics under simulated space conditions in presence of outgassing materials at 30°C and 100°C. We used a frequency tripled Nd:YAG laser with 355 nm wavelength, 3 ns pulse length and 100 Hz repetition rate. Optics were exposed to fluence values in the range of 0.5 – 1.0 J/cm2. As contamination samples epoxy, silicone and polyurethane containing materials were used. The depositions were monitored online and in-situ by measuring the fluorescence intensity distribution with CCD cameras, where the UV laser beam itself served as excitation source for fluorescence emission. This method allows for a very sensitive detection of the onset of deposit formation. Contaminant layers with a thickness down to 20 nm can be consistently detected. The influence of water on the formation of deposits was investigated. Time-of-flight secondary ion mass spectroscopy (ToFSIMS) was used for chemical characterization of the deposits.

Paper Details

Date Published: 21 November 2017
PDF: 5 pages
Proc. SPIE 10567, International Conference on Space Optics — ICSO 2006, 1056738 (21 November 2017); doi: 10.1117/12.2308066
Show Author Affiliations
Helmut Schröder, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Wolfgang Riede, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Hamid Kheyrandish, CSMA-MATS (United Kingdom)
Denny Wernham, ESA-ESTEC (Netherlands)
Yngve Lien, ESA-ESTEC (Netherlands)


Published in SPIE Proceedings Vol. 10567:
International Conference on Space Optics — ICSO 2006
Errico Armandillo; Josiane Costeraste; Nikos Karafolas, Editor(s)

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