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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 extensive transmission wavelength range from 0.6 to 1.6μm and are often optimized for the IR range of 3-16μm after AR coating. Its absorption coefficient is in particular low in the IR range, this trait, in combination with its low chromatic dispersion, minimizes signal loss and enables authentic transmission of infrared radiation. ZnSe windows boast outstanding thermal properties, therefore are recommended for thermally demanding condition. With high thermal shock resistance and low absorption, ZnSe windows are an exceptional option for high-power CO2 lasers and thermal imaging cameras. However, the material is relatively soft and chemically sensitive and thus extra caution needs to be taken during cleaning, handling, and mounting.
Shanghai North Optics offers ZnSe Windows made of 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 North Optics. 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
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