Specifications: Calcium Fluoride is used for optical windows, lenses and prisms in the 0.15mkm - 9 mkm range. This material has found wide use in high power laser optics due to its low absorption. Polished surfaces are stable and will last several years under normal conditions. Due to its low refractive index, Calcium Fluoride can be used without anti-reflection coating. Maximum available size:320 mm Dia x 60 mm Thk. ----------------------------------------- Barium Fluoride is used for optical windows, lenses and prisms particularly when transmission into the ultraviolet is desired. The transmission range is 0.2 mkm - 11 mkm. Transmission in the VUV is degraded by prolonged exposure to moist atmosphere, but it is not significantly degraded under high energy irradiation. Barium fluoride is less resistant to attack by water than Calcium Fluoride. Pronounced water attack occurs at 500C, but the material can be used to 800C in a dry environment. Barium fluoride is the most resistant fluoride to high energy radiation, but does not have VUV transmission of the other fluorides. The material is relatively hard but is highly sensitive to thermal shock. Maximum available size:180 mm Dia x 40 mm Thk.