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 or BBAR |
Physical and Optical Properties:
Transmission Range | 0.6 to 16μm | 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 are excellent for various IR applications due to their impressively broad transmission wavelength range from 600nm to 16000nm and low absorption for IR light. ZnSe also exhibits high thermal shock resistance and low chromatic dispersion making ZnSe windows ideal for high-power CO2 lasers and thermal imaging cameras. Additionally, the material is relatively soft and sensitive, thus not recommended for applications in extreme environments. Extra cautions need to be taken during cleaning, handling, and mounting.
Hangzhou Shalom EO offers Windows made from CVD (Chemical Vapor Deposition) ZnSe grown in the USA with high purity. Because ZnSe also has a high refractive index (around 2.4), which normally requires an anti-reflection coating to achieve high transmission, various coating options (AR/BBAR) are provided in Shalom EO. The maximum Diameter is 200mm, while the clear aperture is greater than 90%.
Curves:
1. Transmission curve of the ZnSe windows no coating
2. Transmission curve of ZnSe windows with BBAR/BBAR coating