27 April 2009 Evaluating environmental survivability of optical coatings
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Abstract
In this paper we report an on going research to correlate between optical coating survivability and military (MIL) standards. For this purpose 8 different types of coatings were deposited on 1" substrates of sapphire, multi-spectral ZnS (MS-ZnS), germanium, silicon and BK7. All coatings underwent MIL standard evaluation as defined by customer specifications and have passed successfully. Two other sets were left to age for 12 months at two different locations, one near central Tel-Aviv and one by the shoreline of the Mediterranean Sea. A third set was aged for 2000 hours at a special environmental chamber simulating conditions of temperature, humidity and ultra-violet (UV) radiation simultaneously. Measurements of optical transmission before and after aging from all 3 sets reveal, in some cases, major transmission loss indicating severe coating damage. The different aging methods and their relation to the MIL standards are discussed in detail. The most pronounced conclusion is that MIL standards alone are not sufficient for predicting the lifetime of an external coated optical element and are only useful in certifying the coating process and comparison between coatings.
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Shay Joseph, Doron Yadlovker, Orna Marcovitch, Hedva Zipin, "Evaluating environmental survivability of optical coatings", Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 73020I (27 April 2009); doi: 10.1117/12.816463; https://doi.org/10.1117/12.816463
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