Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7µ M. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium fluoride's low index or refraction allows it to be used without an anti-reflective coating.

Diameter mm	Other on request
Dimensional Tolerance (mm)	± 0.1
clean Clear Aperture(%)	90%
Thickness (mm)	Other on request
Thickness Tolerance (mm)	± 0.20
Surface Accuracy (λ )	1/4λ
Surface Quality	60-40
Parallelism (arcminutes)	1
Substrate	CaF2