Crystals Materials
Zinc Selenide (ZnSe) for high-power CO2 laser optical components
  • Surface Quality: 10/5 Scratch/Dig MIL-O-1380A
  • Parallelism: < 10″
  • Perpendicularity: < 5'
  • Clear Aperture: > 90%
  • Surface Flatness: < λ/10 @ 632.8 nm
  • Coating: AR/HR/PR coating upon customer's request
  • Quality Warranty Period: One year
  • Zinc selenide (ZnSe) is an optical inert material known for its high purity, strong environmental adaptability, and ease of processing. It exhibits minimal light transmission loss and excellent transparency. With low absorption and resistance to thermal shock, zinc selenide material has high transmittance in the wavelength range of 600 nm to 16 μm, making it the preferred material for high-power CO2 laser optical components.

    Specifications of Zinc Selenide (ZnSe)
    Material Zinc Selenide (ZnSe)
    Diameter 3mm ~ 300mm
    Thickness >0.1mm
    Dimension Tolerance +0/-0.02mm
    Angle Tolerance ±15 arcsec
    Surface Accuracy λ/10 @ 633nm
    Surface Quality S/D 10–5
    Pyramid Tolerance <5 arcmin
    Bevel <0.25mm X 45°
    Coating Available upon request
    Physical and optical properties
    Crystal Structure Cubic
    Density 5.27 g/cm³
    Crystal Size <100 μm
    Impurities None > 0.05 mm
    Resistivity > 10^12 ohm-cm
    Dielectric Constant Consult Technical Personnel
    Absorption Coefficient @10.6μm <0.0005 cm^-1
    Thermal Optical Coefficient (dn/dT) @10.6μm 6.1 × 10^-5 ℃
    Refractive Index Uniformity @0.6328μm <3 × 10^-6
    Thermal Conductivity @20°C 0.18 W/cm/℃
    Specific Heat 0.356 J/g/℃
    Linear Expansion Coefficient @20°C 7.57 × 10^-6/℃
    Young's Modulus 67.2 GPa (9.75 × 10^6 psi)
    Fracture Modulus 55.1 MPa (8,000 psi)
    Knoop Hardness 105-120 kg/mm²
    Poisson's Ratio 0.28
    Fracture Toughness 0.5 × 10^6 N/m^3/2

    Stock specification list

    If need other specifications and quantities products, please contact us(
    Part Number Face size Thickness Surface Quality Coating
    WIN-080-020-ZnSe Dia 8.00 mm 2.00 mm 40/20 UnCoated
    WIN-127-020-ZnSe Dia 12.70 mm 2.00 mm 40/20 UnCoated


  • Anti-reflection coatings are available at your specified wavelength.
  • Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
  • To inquiry or order a finished Zinc Selenide (ZnSe) windows, please specify the specification listed above, for common application, we only need to know the main specification: Cr-dopant concentration, sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.
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