This document provides data on materials that are used for optical components (mirrors, lenses, and windows) in different parts of the electromagnetic spectrum. Mirrors
X-rays
Ultraviolet aluminum
Visible aluminum
Near infrared gold
infrared copper, gold
Lenses
X-rays
Ultraviolet fused silica (synthetic quartz), sapphire
Visible glass, sapphire
Near infrared glass, sapphire
infrared CaF2, ZnSe
Windows
X-rays beryllium
Ultraviolet fused silica, sapphire
Visible glass, sapphire
Near infrared glass, sapphire
infrared NaCl, BaF2, CaF2, ZnSe
Refractive index of some optical materialsmediumn*air1.0003water1.333CaF21.434BaF21.474glass1.5-1.9synthetic quartz (fused silica)1.458crystalline quartz1.544 (no), 1.553 (ne)calcite1.658 (no), 1.486 (ne)sapphire1.769diamond2.417silicon3.478 (1.55 µm)ZnSe2.6242.403 (10.6 µm) *Refractive index at 589.3 nm and room temperature, unless noted otherwise.
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