Optical device comprising substrate of betaeucryptite or fused silico, an optical component and a fusion seal comprising a low melting glass frit and a mill addition

摘要

An optical device, and a method of producing the device, are disclosed. The device comprises a substrate having a near-zero, or negative, coefficient of thermal expansion and an optical component affixed to the substrate with a fusion seal, the seal being the fused product of a low melting glass frit having a positive CTE and a mill addition of a glass-ceramic having an effective negative CTE.