Optical ZnSe window

(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 (Oh....

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