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Proceedings Paper

Removal of laser-induced contamination on ALADIN laser optics by UV/ozone cleaning
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Paper Abstract

The ESA satellite Aeolus was successfully launched into space in August 2018 and measures global wind profiles using the Atmospheric Laser Doppler Instrument (ALADIN). ALADIN features a high-power UV laser source emitting nanosecond pulses at a wavelength of 355 nm. A crucial step in the development of ALADIN was the mitigation of laser-induced contamination (LIC). In this work we assess the opportunity of removing LIC deposits using UV/ozone cleaning with a mercury lamp. We find that UV/ozone cleaning is a very effective tool for removing laser-induced molecular contamination induced by the volatile components of a material mix representative of the ALADIN laser. Furthermore, we show that optical surfaces on which a contamination is removed via UV/ozone cleaning behave similar to pristine optical surfaces with respect to their susceptibility to subsequent LIC as well as laser-induced damage. These results demonstrate that UV/ozone cleaning is a useful and safe way of cleaning optical surfaces after ground-based thermal vacuum/lifetime testing.

Paper Details

Date Published: 20 November 2019
PDF: 10 pages
Proc. SPIE 11173, Laser-induced Damage in Optical Materials 2019, 111731C (20 November 2019); doi: 10.1117/12.2535772
Show Author Affiliations
Nils Bartels, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Paul Allenspacher, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Wolfgang Riede, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Helmut Schröder, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Denny Wernham, ESA-ESTEC (Netherlands)


Published in SPIE Proceedings Vol. 11173:
Laser-induced Damage in Optical Materials 2019
Christopher Wren Carr; Vitaly E. Gruzdev; Detlev Ristau; Carmen S. Menoni, Editor(s)

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