- CaF2 Substrate
- Wavelength Range: 180 nm to 8 µm
This Calcium Fluoride (CaF2) High Precision Windows offers high transmission from the vacuum ultraviolet (180 nm) to the infrared (8 µm). Given its low absorption coefficient and high damage threshold, the calcium fluoride crystal is a popular choice for use with excimer lasers. CaF2 windows are also commonly used in cryogenically cooled thermal imaging systems.
CaF2 has many desirable physical and chemical properties. With an Abbe Number of 95, calcium fluoride offers low dispersion. It also has excellent water, chemical, and heat resistance. In dry environments, CaF2 can be used up to 1,000°C, but in the presence of moisture, degradation will occur for temperatures exceeding 600°C. This crystal is also inert to organic chemicals and many acids.
- Thickness: 5 mm
- Thickness Tolerance: ±0.3mm
- Diameter Tolerance: +0.0/-0.2 mm
- Surface Quality: 20-10 Scratch-Dig
- Parallelism: ≤ 10 arsec
- Surface Flatness (@633 nm): λ/8 over Clear Aperture