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ZnSe windows

  • Maximum diameter 200mm
  • CVD ZnSe grown in the USA
  • Broad wavelength range covering 600nm to 16000nm and low IR absorption
  • Low chromatic dispersion
  • Coating options: AR@3-5μm, AR@8-12μm, BBAR@3-12μm
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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%.


1. Transmission curve of the ZnSe windows no coating

2. Transmission curve of ZnSe windows with BBAR/BBAR coating