Calcium fluoride windows are versatile optical components employed across numerous applications, distinguished by several unique attributes. Structurally, calcium fluoride crystallizes in a cubic system—rendering it optically isotropic and free from birefringence—making it especially suitable for polarization-sensitive systems. Optically, it boasts an exceptionally broad transmission range. In practical terms, calcium fluoride exhibits excellent thermal stability and chemical resistance, maintaining consistent performance even at elevated temperatures and remaining largely unaffected by environmental conditions. Additionally, it features low optical absorption and a high laser-induced damage threshold. However, calcium fluoride windows do have certain operational limitations: their mechanical strength and hardness are relatively low, rendering them susceptible to scratching or impact. To ensure reliable performance, protective sealing is strongly recommended.
| Coating | Anti-Reflective (AR) Coating |
| Diameter | 4-500mm |
| Dimensional Tolerance | +/-0.1mm |
| Thickness Tolerance | +/-0.1mm |
| Parallelism | ≤30 ArcSec |
| Surface Quality | 40/20 |
| Wavefront Accuracy | λ/10 @ 633 nm |
| Edge Chamfer | 0.2mm× 45° |
| Material | Single-Crystal Calcium Fluoride |
