Specifications:
| Materials | CVD ZnSe crystals | Diameter Range | ~200mm |
| Diameter Tolerance | +0.0/-0.2mm | Thickness Tolerance | +/-0.2mm |
| Surface Quality | 60/40 S/D | Frings (N) | 3 |
| Irregularity (delta N) | 1 | Centration | 3' |
| Chamfer | 0.1-0.3mmx45 degree | Coatings | AR/AR@7-14micro BBAR/BBAR@3-12 micro |
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 | 18 W m-1 K-1 at 98K |
| 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 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) lenses 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 deposition (or CVD) material commonly used in thermal imaging, military and medical systems. Zinc selenide (ZnSe) 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
