Analysis of the air-vacuum effect in dielectric coatings

Wolfgang Riede; Paul Allenspacher; L. Jensen; M. Jupé

doi:10.1117/12.804095

30 December 2008 Analysis of the air-vacuum effect in dielectric coatings

Wolfgang Riede, Paul Allenspacher, L. Jensen, M. Jupé

Proceedings Volume 7132, Laser-Induced Damage in Optical Materials: 2008; 71320F (2008) https://doi.org/10.1117/12.804095
Event: Boulder Damage Symposium XL Annual Symposium on Optical Materials for High Power Lasers, 2008, Boulder, Colorado, United States

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.

Citation Download Citation

Wolfgang Riede, Paul Allenspacher, L. Jensen, and M. Jupé "Analysis of the air-vacuum effect in dielectric coatings", Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 71320F (30 December 2008); https://doi.org/10.1117/12.804095

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