Silicon lenses are popular for many applications in the IR. They are typically used for imaging applications in the 3-5 μ m region of the spectrum, making them excellent for security and military applications. They can also be used to collimate infrared lasers. These lenses are coated with a BBAR coating that provides 98% transmission in the 3-5 μ m spectral range.

Guide for IR materials
Wavelength Range	Substrate Material
150 nm - 5.0 μm	Sapphire
180 nm - 8.0 μm	Calcium Fluoride (CaF2)
200 nm - 6.0 μm	Magnesium Fluoride (MgF2)
600 nm - 16 µm	Zinc Selenide (ZnSe)
1.2 - 8.0 μm	Silicon (Si)
2.0 - 16 μm	Germanium (Ge)

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