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ZnSe windows

  • Maximum diameter 200mm
  • Broad wavelength range covers 3μm to 16μm
  • Coating options: AR@3-5μm, AR@8-12μm, BBAR@3-12μm
  • Low dispersion and low absorption coefficient
Curves All Inquire Us  


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.


1. Transmission curve of the ZnSe windows no coating

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