Telecommunications, Fiber Optic, CaF2: application wavelength 0. 13-9. 0um (T90%@0. 3-7. 0um, 3. 0mm) Mono crystalline biggest size: diameter 200. 00mm, or. IR, UV, or VUV grade. size range Dia5. 0-220mm. BaF2: application wavelength 0. 15-12. 5um (T90%0. 35-10. 0um, 3. 0mm) Poly crystalline biggest size: 150mm, or, IR or UV grade ...