VY Optics Photoelectric Technology Co., Ltd.

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    ZnSe lens

    ZnSe is used for optical windows, lenses, mirrors, prisms and optical blanks, plates, disks, sheets, slabs particularly for infrared applications  ZnSe (Zinc Selenide) crystalZinc Selenide (ZnSe) — transparent in wide spectral range from yellow (visible) to far IR. ZnSe material is a chemically inert, non-hygroscopic and highly pure product that is very effective in many optical applications due to its extremely low bulk losses, high resistance to thermal shock and stability in virtually all environments, easily machined. To obtain superior transmittance, ZnSe crystals are grown by Chemical Vapor Deposition process (CVD). Zinc Selenide CVD is polycrystalline material, demonstrates superior CO2 laser transmittance and is employed in the transmission optical components used in CO2 laser processing. ZnSe (Zinc Selenide) Chemical Vapor Deposition (CVD) material is produced by synthesis from zinc vapour and H2Se gas, forming as sheets on graphite susceptors (ZnSe-CVD processes). Chemical purity of CVD-ZnSe 99.999%. It has à polycrystalline structure; the grain size of Zinc Selenide CVD material is controlled to produce maximum strength. The transmission range of Zinc Selenide ZnSe-CVD is (0.5 – 20) microns. ZnSe CVD used for high power CO2 laser optics at 10.6 microns, for protective optics windows or optical elements in FLIR (forward looking infrared) thermal imaging equipment, optics for medical and industrial applications (optical plane parallel windows (plates, disks, sheets, slabs, blanks), wedged windows, Brewster windows, optical meniscus, spherical and cylindrical lenses, prisms, resonator mirrors of CO2 laser). Single crystal ZnSe Zinc Selenide is available, but is not common, it has lower bulk losses and thus more effective for CO2 optics.
    ZnSe (ZINC SELENIDE) base properties
    Density:5.27 g/cm3
    Melting Point: 1525°C (dissociates about 700°C)
    Thermal Conductivity: 18 W/(m K) at 298K
    Thermal Expansion: 7.1 x 10-6/°C at 273K
    Hardness Knoop: 120 with 50g indenter
    Specific Heat Capacity: 339 J/(kg K)
    Young's Modulus (E): 67.2 GPa
    Bulk Modulus: (K) 40 GPa
    Apparent Elastic Limit: 55.1 MPa (8,000psi)
    Poisson Ratio: 0.28
    Resistivity: ~1012 (Ohm x cm)
    Chemical properties of Zinc Selenide ZnSe CVD
    Solubility: 0.001 g/100g water
    Molecular Weight: 144.33
    Crystal Structure polycrystalline ZnSe (CVD) Laser grade, grain size (50-70) microns ZnSe (CVD) IR optical grade, grain size (20-100) microns
    Transmission Range: 0.6 - 21.0 microns
    Refractive Index: 2.4028 at 10 microns
    Reflection Loss: 31.11% at 10.6 µm (2 surfaces)
    dn/dT +61 x 10-6/°C at 10.6µm at 298K
    dN/dµ = 0 5.5µm