Materials> Zinc Selenide
|
Barium FluorideOVERVIEWBarium Fluoride can be used in the ultraviolet, visible and infrared spectral regions. Barium fluoride is commonly used in cryogenically cooled thermal imaging systems. Barium fluoride windows can be found in infrared spectroscopy applications (ex. in the field of fuel oil analysis). Its transmittance at 200 nm is relatively low (0.60), but at 500 nm it goes up to 0.96-0.97 and stays at that level until 9 µm, then it starts falling off (0.85 for 10 µm and 0.42 for 12 µm). Barium Fluoride is half as hard as Calcium Fluoride and also more susceptible to thermal shock. It is somewhat more expensive than Calcium Fluoride and not as readily available in large sizes. PRODUCTSPhoenix Infrared offers BaF2 as blanks, generated parts, polished optics, and coated optics. BaF2 optics include: optical windows, lenses, and prisms, particularly when transmission into the ultraviolet is desired. Barium Fluoride is less resistant to attack by water than Calcium Fluoride but attack does not begin until 500°C. In the dry atmosphere Calcium Fluoride can be used up to 800°C. Barium Fluoride is the most resistant fluoride to high energy radiation but does not have the VUV transmission of other types.
|
 |