... absorption, high damage threshold, High Transmission UV Grade Calcium Fluoride, Ideal for Applications Ranging from 250nm thru 7μ ... : High power laser optics, excimer laser.Description:Calcium Fluoride has excellent transmission in the UV, they are ... Knoop hardness of calcium fluoride is 158.3. Calcium Fluoride (CaF2) Windows manufactured from vacuum UV grade calcium fluoride are commonly found ...