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Germanium (Ge) is the preferred lens and window material for high performance infrared imaging systems in the 8–12 µm wavelength bands. Its high refractive index makes Ge ideal for low power imaging systems because of minimum surface curvature. Chromatic aberration is small, often eliminating the need for correction.   Germanium is most widely used for lenses and windows in IR systems operating in the 2µm-12µm range. Germanium is a high index material that is used to manufacture Attenuated Total Reflection (ATR) prisms for spectroscopy. Its refractive index is such that germanium makes an effe