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ZnSe Domes

  • Broad wavelength range 3 µm to 16 µm
  • Covers MWIR and LWIR spectra
  • CVD grown materials
  • Ideal for thermally demanding environments
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Materials CVD ZnSe Diameter Range ~ 280mm
Thickness Tolerance +/-0.2mm (Optional:+/-0.1mm and +/-0.05mm) Surface Quality 60/40 S/D
Frings (N) customized Irregularity (delta N) customized
Chamfer 0.1~0.3mmx45degree Coating AR/AR@7-12μm

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 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) domes is an excellent choice for its broad wavelength range (3 µm to 16 µm), which covers MWIR and LWIR wavelength range. Zinc selienide is a chemically vapor deposition (or CVD) materials 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. ZnSe has an excellent thermal properties which is ideal for thermally demanding environment applications.


1. Transmission Curve of ZnSe Windows No Coating


2. Transmission Curve of ZnSe Windows with BBAR/BBAR Coating