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21 November 2017 Investigation of laser induced deposit formation under space conditions
H. Schröder, S. Borgmann, W. Riede, Denny Wernham
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Proceedings Volume 10566, International Conference on Space Optics — ICSO 2008; 105661K (2017) https://doi.org/10.1117/12.2308207
Event: International Conference on Space Optics 2008, 2008, Toulouse, France
Abstract
In this paper comprehensive investigations of laser induced deposit formation are reported. In a high vacuum chamber (p < 10-6 mbar) different space relevant materials containing epoxy, silicone and polyurethane based components were tested under space conditions. The experiments were performed with a pulsed Nd:YAG laser with peak fluences up to 2.5 J/cm2 at 355 nm wavelength and 3 ns pulse width. Additional tests were performed with an UV cw laser diode at 375 nm and 10 mW mean power. The onset and growth of the deposits was monitored in-situ and online by UV induced fluorescence imaging. The influence of roughness, temperature and chemical composition of the optical surface on the deposition process was investigated. Time-of-flight secondary ion mass spectroscopy (ToF-SIMS) was used for chemical characterization of the deposits. Furthermore the influence of deposits on the UV-transmission of the optics was estimated.
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H. Schröder, S. Borgmann, W. Riede, and Denny Wernham "Investigation of laser induced deposit formation under space conditions", Proc. SPIE 10566, International Conference on Space Optics — ICSO 2008, 105661K (21 November 2017); https://doi.org/10.1117/12.2308207
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KEYWORDS
Luminescence
Silicon
Contamination
Semiconductor lasers
Silica
Temperature metrology
Epoxies
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