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Zinc Selenide (ZnSe) is a crystal that can penetrate light in the infrared spectrum region from visible light to 20μm.
In the 3-5um range, silicon is the most common material for making optical lenses and optical Windows in efficient infrared imaging systems.
Sapphire Al₂O₃ can be very good for UV, VIS and NIR spectral bands of optical window materials because of its extreme toughness and strength.
Ge germanium window has a high refractive index, the application range of 2-15 microns, visible light does not penetrate.
Ruike Optics manufacture big Optics include optical windows, we can make high precision 1/20 lambda within 60mm CA.
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