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Laser-induced hydrocarbon contamination in vacuum

Riede, Wolfgang and Allenspacher, Paul and Schröder, Helmut and Wernham, Denny and Lien, Yngve (2006) Laser-induced hydrocarbon contamination in vacuum. In: Boulder Damage Symposium, 37, 59910H-1-59910H-13. SPIE. 37th Annual Boulder Damage Symposium, 2005-09-19, Boulder, CO (USA). ISBN 0-8194-6013-3. ISSN 0277-786X

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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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Laser-induced hydrocarbon contamination in vacuum
Authors:
AuthorsInstitution or Email of Authors
Riede, WolfgangUNSPECIFIED
Allenspacher, PaulUNSPECIFIED
Schröder, HelmutUNSPECIFIED
Wernham, DennyESA/ESTEC
Lien, YngveESA/ESTEC
Date:2006
Journal or Publication Title:Boulder Damage Symposium
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:37
Page Range:59910H-1-59910H-13
Editors:
EditorsEmail
SPIE, UNSPECIFIED
Publisher:SPIE
Series Name:Laser-Induced Damage in Optical Materials
ISSN:0277-786X
ISBN:0-8194-6013-3
Status:Published
Keywords:Laser-induced contamination, aromatic hydrocarbons, lifetime tests, vacuum chamber, toluene partial pressure.
Event Title:37th Annual Boulder Damage Symposium
Event Location:Boulder, CO (USA)
Event Type:international Conference
Event Dates:2005-09-19
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics
Deposited By: Wolfgang Riede
Deposited On:30 Mar 2006
Last Modified:27 Apr 2009 05:05

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