Sapphire Optical Windows
Meller Optics sapphire windows rank 9 on the Mohs scale, giving them a hardness that is second only to diamond. Providing robust protection against fast moving dirt, sand, and saltwater, they can be enhanced with multi-spectral anti-reflective coatings that can meet salt fog requirements.
The windows are available in three quality grades to suit a variety of needs:
- Standard – low-cost option ideal for high-volume applications
- Superior – for more demanding applications where image quality and minimizing birefringence effects are important
- High-Precision – for critical optical and laser applications
Diameter, thickness and orientation can be customized to your specifications.
| Standard | Superior | High-Precision | |
| Crystallographic Orientation | Random or c-plane | C-plane | C-plane |
| Diameter Tolerance |
0.250 - 1.250": +/-.002” 1.375 - 2.000": +/-.004” |
+ 0.00mm / - 0.10mm | + 0.00mm / - 0.10mm |
| Thickness Tolerance |
0.250 - 1.250": +/-.002” 1.375 - 2.000": +/-.004” |
+/- 0.10mm | +/- 0.10mm |
| Parallelism |
0.250 - 0.375": 10 arcmin max 0.500 - 0.750": 5 arcmin max 1.000 - 2.000": 3 arcmin max |
10 arcsec max | 2 arcsec max |
| Surface Quality | 80-50 per MIL-PRF-13830 | 20-10 per MIL-PRF-13830 | 10-5 per MIL-PRF-13830 |
| Clear Aperture | Central 80% of diameter face | Central 85% of diameter face | Central 90% of diameter face |
