CaF2 Windows
Description:
Calcium Fluoride (CaF2) has excellent transmission in the UV; they are often used to make windows with high transmittance from below 150 nm and extending through out the visible range. CaF2 Windows are relatively soft and somewhat hygroscopic so polishing, coating and handling are more critical than UV Fused Silica windows. In addition, the quality of a UV window can be extremely critical; it should be of high purity and polish in order not to affect the optical system.
Applications:
CaF2 Windows are applicable for a wide range of spectrum, particularly for 2980nm laser application.
Specifications:
| Diameter (Φmm) | 8.0, 10.0, 12.7, 15.0, 20.0, 25.4, 30.0 |
| Thickness (mm) | 1.0, 2.0, 3.0, 4.0 |
| Diameter Tolerance (mm) | +0.0/-0.2 (General), +0.0/-0.1 (High Precision) |
| Thickness Tolerance (mm) | ±0.2 (General), ±0.05 (High Precision) |
| Clear Aperture | >80% (Small Size), >90% (Large Size) |
| Parallelism | 3 min. (General), 10 sec. (High Precision) |
| Surface Quality: Scratch/Dig | 80/50 (General), 40/20 (High Precision) |
| Flatness (per 25mm@633nm) | λ(General), λ/4 (High Precision) |
| Bevel (face width x 450) | <0.25mm |
| Coating | Upon customer’s request |