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25 February 2004 Aging under mechanical stress: first experiments and related simulations for a silver-based multilayer mirror
Arnaud Lalo; Guillaume Ravel; Michel Ignat; Bernard Cousin; Michael V. Swain
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Proceedings Volume 5250, Advances in Optical Thin Films; (2004) https://doi.org/10.1117/12.512968
Event: Optical Systems Design, 2003, St. Etienne, France
Abstract
Improving materials and devices reliability is a major concern to the spatial industry. Results are reported for satellite mirrors-like specimens consisting in oxide-protected metal systems. Optical coatings were deposited by electron beam evaporation. Mechanical stress fields in multi-layered materials play an important role. The stress state can have far-reaching implications both in kinetics and thermodynamics. Therefore an integrated apparatus with four-point bending equipment was designed. The technique allowed us to exert stress into a film or a system of films on a substrate concurrently with thermal treatment. In order to achieve the first tests performed with the help of the apparatus, various preliminary characterizations were required. The article reports the preliminary micro-mechanical testing of the materials (ultra micro-indentation to evaluate the elastic modulus of the samples materials and wafer curvature technique to determine the specimen residual stress) and the first ageing experiment. Experimental evidence of accelerated ageing under stress is successfully reported.
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Arnaud Lalo, Guillaume Ravel, Michel Ignat, Bernard Cousin, and Michael V. Swain "Aging under mechanical stress: first experiments and related simulations for a silver-based multilayer mirror", Proc. SPIE 5250, Advances in Optical Thin Films, (25 February 2004); https://doi.org/10.1117/12.512968
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