Caesium Iodide (Cesium Iodide) is the material with the deepest known IR transmission, and is sometimes used for components in the widest range spectrophotometers.
An extremely soft material, Caesium Iodide is extremely difficult to polish, and so performance is compromised for range.
Doped with Thallium, CsI(Tl) is a useful scintillator which emits at a wavelength that is a good match for Silicon photodiodes. Arrays of Caesium Iodide are used in security imaging systems.
Specifications
Transmission Range
0.25 to 55 μm
Reflection Loss
13.6% at 10 μm
Absorption Coefficient
n/a
Refractive Index
1.73916 at 10 μm
Melting Point
621 °C
Hardness
Knoop 20 with 200g indenter
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