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Proceedings Paper

Analysis of the air-vacuum effect in dielectric coatings
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Paper Abstract

As a consequence of the ongoing interest for deployment of laser systems into space, optical coatings have to be developed which allow for reliable long term operation under vacuum conditions. Extensive laser damage tests for space qualification of laser optics have recently been performed at the DLR and LZH laser damage test facilities in the IR, VIS, and UV spectral range within the ESA-ALADIN (Atmospheric Laser Doppler Instrument) test campaign. These tests have consistently revealed the degradation of the LIDT values for e-beam evaporated dielectric coatings under vacuum environment, which occurred independently of wavelength and type of coating (HR or AR) and other parameters. Dense coatings like IAD-based coatings, on the other hand, did not show this effect. Water desorption and diffusion processes seem to mediate the degradation under vacuum exposure.

Paper Details

Date Published: 30 December 2008
PDF: 10 pages
Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 71320F (30 December 2008); doi: 10.1117/12.804095
Show Author Affiliations
Wolfgang Riede, German Aerospace Ctr. (Germany)
Paul Allenspacher, German Aerospace Ctr. (Germany)
L. Jensen, Laser Zentrum Hannover e.V. (Germany)
M. Jupé, Laser Zentrum Hannover e.V. (Germany)

Published in SPIE Proceedings Vol. 7132:
Laser-Induced Damage in Optical Materials: 2008
Gregory J. Exarhos; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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