Specifications:
| Materials | CVD ZnSe | Diameter Range | ~ 280mm |
| Thickness Tolerance | +/-0.2mm (Optional:+/-0.1mm and +/-0.05mm) | Surface Quality | 60/40 S/D |
| Frings (N) | customized | Irregularity (delta N) | customized |
| Chamfer | 0.1~0.3mmx45degree | Coating | AR/AR@7-12μm |
Physical and Optical Properties:
| Transmission Range | 0.6 to 21.0μm | Refractive Index | 2.4028 at 10.6μm |
| Reflection Loss | 29.1% at 10.6μm (2 surfaces) | Absorption Coefficient | 0.0005 cm-1 at 10.6μm |
| Reststrahlen Peak | 45.7μm | dn/dT | +61 x 10-6 /°C at 10.6μm at 298K |
| dn/dμ = 0 | 5.5μm | Density | 5.27 g/cc |
| Melting Point | 1525°C (see notes below) | Thermal Conductivity | 7.1 x 10-6 /°C at 273K |
| Hardness | Knoop 120 with 50g indenter | Specific Heat Capacity | 339 J Kg-1 K-1 |
| Dielectric Constant | n/a | Youngs Modulus (E) | 67.2 GPa |
| Shear Modulus (G) | n/a | Bulk Modulus (K) | 40 GPa |
| Elastic Coefficients | Not Available | Apparent Elastic Limit | 55.1 MPa (8000 psi) |
| Poisson Ratio | 0.28 | Solubility | 0.001g/100g water |
| Molecular Weight | 144.33 | Class/Structure | HIP polycrystalline cubic, ZnS, F43m |
Zinc Selenide (ZnSe) domes is an excellent choice for its broad wavelength range (3 µm to 16 µm), which covers MWIR and LWIR wavelength range. Zinc selienide is a chemically vapor deposition (or CVD) materials commonly used in thermal imaging and medical systems. Zinc selenide (ZnSe) windows has a high index of refraction which normally requires an anti-reflection coating to achieve high transmission. Zinc selenide is relatively soft with low scratch resistance thus not recommended for use in harsh environment. ZnSe has an excellent thermal properties which is ideal for thermally demanding environment applications.
Curves:
1. Transmission Curve of ZnSe Windows No Coating
2. Transmission Curve of ZnSe Windows with BBAR/BBAR Coating
