Crystals Materials
Zinc Selenide (ZnSe) for optical components for high-power CO2 lasers
  • 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 x 10-5
    Refractive Index Uniformity @0.6328μm <3 x 10-6
    Thermal Conductivity @20°C 0.18 W/cm/℃
    Specific Heat 0.356 J/g/℃
    Linear Expansion Coefficient @20°C 7.57 x 10-6/℃
    Young's Modulus 67.2 GPa (9.75 x 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 x 10-6 N/m^3/2

    Stock specification list

    If need other specifications and quantities products, please contact us(
    CVD ZnSe Focus Lens/Convex Lens/Concave Lens/Meniscus Lens Specifications
    Part No. Diameter Effective Focal Length Edge Thickness Coating
    FCL-025-038-02-ZnSe Dia 25.40 mm 38.10 mm 2.00 mm AR@1064 nm + 650 nm
    PCL-027-150-02-ZnSe Dia 25.40 mm 127.0 mm 2.59 mm AR@1064 nm
    CVD ZnSe Partial Reflectors Specifications
    Part No. Diameter Edge Thickness Coating
    PRL-025-060-ZnSe Dia 25.40 mm 6.00 mm AR@1064 nm/PR@1064 nm(R=65%)
    PRL-027-080-ZnSe Dia 25.40 mm 8.00 mm AR@1064 nm/PR@1064 nm(R=65%)
    CVD ZnSe Windows/Beam Combiner/Beam Expander
    Part No. Face size Thickness Coating
    WIN-080-020-ZnSe Dia 8.00 mm 2.00 mm UnCoated
    WIN-127-020-ZnSe Dia 12.70 mm 2.00 mm UnCoated
    WIN-080-020-ZnSe Dia 80.00 mm 3.00 mm AR@1064 nm
    BCL-080-020-ZnSe Dia 20.00 mm 1.50 mm AR@1064 nm + 650 nm


  • 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: sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.
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