| Specifications of ZnSe Lenses |
Substrate Material: ZnSe |
Surface Figure: λ/20 before coating at 10.6μm |
Surface Quality: 40-20 per MIL-PRF-13830B |
Dimensional Tolerance: + 0.00mm, - 0.25mm |
Thickness Tolerance: +/- 0.25mm |
Chamfer: 0.35mm at 45° typical |
Concentricity: < 0.05mm |
Focal Length Tolerance: +/- 2% |
Antireflection Coating: Ravg < 0.6% per surface at 3-5μm |
| Ravg < 0.75% per surface at 8-12μm |
| Ravg < 0.5% per surface at 10.6μm |
Clear Aperture: Exceeds central 85% of dimension |
Absorption: <0.3% total absorption as measured by CO2 laser calorimetry |
Design Wavelength: 10.6μm |