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Proceedings Paper

Laser-induced hydrocarbon contamination in vacuum
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Paper Abstract

We investigated laser-induced deposition processes on BK7 substrates under the influence of pulsed Q-switched Nd:YAG laser radiation, starting from small toluene partial pressures in a background vacuum environment. The composition and structure of the deposit was analyzed using microscopic methods like Nomarski DIC, dark-field and white-light interference microscopy, TEM, EDX and XPS. We found a distinct threshold for deposition built-up dependant on the partial pressure of toluene (0.2 J/cm2 at 0.1 mbar, 0.8 J/cm2 at 0.01 mbar toluene). The deposits strictly followed the spherical geometry of the laser spot. No deposit accumulated on MgF2 AR coated BK7 samples even at high toluene partial pressures. The onset of deposit was accompanied by periodic surface ripples formation. EDX and XPS analysis showed a carbon-like layer which strongly absorbed the 1 μm laser radiation. The typical number of shots applied was 50 000. In addition, long term lifetime tests of more than 5 Mio. shots per site were run.

Paper Details

Date Published: 7 February 2006
PDF: 13 pages
Proc. SPIE 5991, Laser-Induced Damage in Optical Materials: 2005, 59910H (7 February 2006); doi: 10.1117/12.638765
Show Author Affiliations
Wolfgang Riede, DLR (Germany)
Paul Allenspacher, DLR (Germany)
Helmut Schröder, DLR (Germany)
Denny Wernham, European Space Agency/ESTEC (Netherlands)
Yngve Lien, European Space Agency/ESTEC (Netherlands)

Published in SPIE Proceedings Vol. 5991:
Laser-Induced Damage in Optical Materials: 2005
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; Detlev Ristau; M.J. Soileau; Christopher J. Stolz, Editor(s)

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