Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7µm. 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. The Knoop hardness of calcium fluoride is 158.3. TECHSPEC® Calcium Fluoride (CaF2) Windows manufactured from vacuum UV grade calcium fluoride are commonly found in cryogenically cooled thermal imaging systems.
| Edmund Optics Inc. | |
|---|---|
| Product Category | Optical Windows |
| Product Number | NT47-682 |
| Product Name | 12.5mm Dia. Calcium Fluoride Window, Uncoated |
| Window Type | Plane |
| Window Material | Vacuum UV Grade CaF |
| Window Shape | Circular |
| Window Diameter, Side Length, or Rectangular Length | 12.5 mm (0.4921 inch) |
| Thickness | 2 mm (0.0787 inch) |
