Ge has high refractive index, The transmission wavelength for Monocrystal Germanium is 2-12um, it is a common infrared crystal which is widely used for infrared image system and infrared spectrograph systems. Ge has a small absorbency at 10.6um. It is a good material for CO2 lens and windows. Three kinds AR Coating are available: 3-5 μm for mid-infrared applications. 3-12 μm for broadband multispectral applications, and 8-12 μm for thermal imaging applications.Germanium optical materials are also suitable to be used with wavelength of 8-12μm.Germanium is highly affected by temperature, and the transmittance decreases with increasing temperature; therefore, they can only be used below 100C.The density of germanium (5.33 g/cm3) should be taken into account when designing systems with strict weight requirements.Germanium is mainly used in thermal imaging systems and forward looking infrared (FLIR).Germanium has a Knoop hardness of 780, about twice that of magnesium fluoride, making it suitable for IR applications in variable optics.

 Uncoated Ge

Optical Properties

Refractive index range(20℃)

Manufacture Specifications

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