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Characterization of candidate bonding glasses for composite IR window structures

Although there are several materials which have properties that make them attractive as IR window materials for electro-optical systems operating in the 8 - 12 micrometer range, no single material possesses the superior mechanical, optical, and thermal properties required for current supersonic window applications. Hence, composite structures have been examined for use in airborne window systems to maximize erosion resistance, provide high optical quality and maintain thermal stability. This paper reports the identification of a suitably robust bonding glass possessing the needed thermal, mechanical and optical properties for use in a ZnSe/glass/diamond composite structure. Recent results of our property characterization studies on candidate glasses are reported.