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Available Germanium Products: Germanium Windows, Germanium Mirrors, Germanium Lens, Germanium Wafers, Germanium blank, Germanium Balls Germanium(Ge) based optical components are widely used for IR applications. Its blocks UV and visible light and in the infrared up to about 2m. Ge based optical components include mirrors, windows and lenses etc., properties below: Crystal Type: Cubic Lattice Parameter: a=5.**7 degree Transmission Band: ***2 um Mohs Hardness: 6.3 Density: 5.*3g/cm3 Melting Point: **7 ℃ Refractive Index: 4.***2 at *0.6um Resistivity: ***0 ohm-cm Young’s Modulus: **3 GPa Thermal Expansion: 6.1 x***6/℃ Thermal Conductivity: **7mcal /cm/s/k Ge Widows and Mirrors Specifications: Diameter: *0.0/*0.*0mm Length: +/*0.2mm Chamfer: *+/-*@********************power/irregularity): 1 fringe/0.5 fringe Parallelism: < *0 arc Seconds Perpendicularity: < 5 arc min Surface Quality: *0/*0Scratch/Dig Please land Antek Optics website for detail informations of our Germanium products.