Ø1/2" and Ø1" Calcium Fluoride (CaF2) Bi-Convex Lenses are available uncoated or with a broadband AR coating optimized for the 3 µm to 5 μm spectral range deposited on both surfaces. This coating greatly reduces the surface reflectivity of the substrate, yielding an average transmission in excess of 94% over the entire AR coating range.

CaF2 is commonly used for applications requiring high transmission in the infrared and ultraviolet spectral ranges. The material exhibits a low refractive index, varying from 1.35 to 1.51 within its usage range of 180 nm to 8.0 μm. Calcium fluoride is also fairly chemically inert and offers superior hardness compared to its barium fluoride, magnesium fluoride, and lithium fluoride cousins.

Ø1/2" and Ø1" Versions Available

Broadband AR Coating for the 3.0 - 5.0 μm Range

Focal Lengths from 15.0 mm to 200.0 mm