Calcium fluoride (CaF₂) crystals offer high transmittance and excellent long-term radiation stability, making them widely used in optical instruments. With the advancement of lithography toward shorter wavelengths, CaF₂ has become the preferred material for extreme ultraviolet (EUV) lithography objective lenses. In addition, CaF₂ is also used in the production of important chemical reagents such as hydrogen fluoride, fluorine gas, and other fluorides.
Broad transmission range and low refractive index
Stable mechanical properties
Non-hygroscopic
| Crystal Structure | Cubic, Fluorite Type |
| Cleavage Plane | (111) |
| Lattice Constant | a=0.546 |
| Crystal Orientations | Custom crystal orientations are available upon request |
| Surface Quality | 10-5（MIL-0-13830A） |
| Wavefront Distortion | λ/10 |
