Specifications:
| Materials | CVD ZnSe crystals | Diameter Range | ~ 200mm |
| Aperture | >90% | Dimension Tolerance | +0.0/-0.2mm |
| Thickness Tolerance | +/-0.2mm | Surface Quality | 60/40 S/D |
| Parallelism | 1 arc minute | Chamfer | 0.3-0.5mmx45degree |
| Coating | AR/AR |
Physical and Optical Properties:
| Transmission Range | 0.6 to 21.0 μm | Refractive Index | 2.4028 @ 10.6 μm |
| Reflection Loss | 29.1% at 10.6 μm (2 surfaces) | Absorption Coefficient | 0.0005 cm-1 at 10.6 μm |
| Reststrahlen Peak | 45.7 μm | dn/dT | +61 x 10-6 /°C at 10.6 μm at 298K |
| dn/dμ = 0 | 5.5 μm | Density | 5.27 g/cc |
| Melting Point | 1525°C (see notes below) | Thermal Conductivity | 18 W m-1 K-1 at 298K |
| Thermal Expansion | 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 GPav | 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) windows is an excellent choice for any IR applications due to its broad wavelength range (3 µm to 16 µm). Zinc Selienide is a chemically vapor deposited material 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. Extra caution is required during cleaning, handling, and mounting.
Curves:
1. Transmission curve of the ZnSe windows no coating
2. Transmission curve of ZnSe windows with BBAR/BBAR coating
 Windows01-500x400.jpg)
 Windows01-50x40.jpg)