ZnSe(Zinc Selenide)
Zinc Selenide is transparent from 600 nm -16 um and is ideal for lR applications. lt is well-suited for optical elements in high resolution thermal imaging equipment. ZnSe also transmits some visible light, unlike Germanium and silicon, thereby allowing for visual optical alignment. However, it is quite soft and will scratch easily. ZnSe has an index of refraction of 2.403 at 10.6 um.