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ZnSe Lenses

  • Low dispersion and low absorption coefficient
  • Maximum diameter 200mm
  • Broad wavelength range covers 3μm to 12μm
  • Coating options: AR@3-5μm, AR@8-12μm, BBAR@3-12μm or custom
  • ZnSe Lense for CO2 Laser also available, Click Here to Check!
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Materials CVD ZnSe crystals Diameter Range ~200mm
Diameter Tolerance +0.0/-0.2mm Thickness Tolerance +/-0.2mm
Surface Quality 60/40 S/D Frings (N) 3
Irregularity (delta N) 1 Centration 3'
Chamfer 0.1-0.3mmx45 degree Coatings AR/AR@7-14micro BBAR/BBAR@3-12 micro

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 18 W m-1 K-1 at 98K
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 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) lenses 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 deposition (or CVD) material commonly used in thermal imaging, military and medical systems. Zinc selenide (ZnSe) 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