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Germanium is a high index material that is used to manufacture Attenuated Total Reflection (ATR) prisms for spectroscopy. Germanium Crystal refractive index is such that Germanium makes an effective natural 50% beamsplitter without the need for coatings. Germanium is also used extensively as a substrate for production of optical filters. Germanium covers the whole of the 8-14 micron thermal band and is used in lens systems for thermal imaging. Germanium can be AR coated with Diamond producing an extremely tough front optic.
- Germanium crystal's high index is desirable for the design of lenses that might
not otherwise be possible.
- Germanium crystal has nearly the highest density of the IR-transmitting materials, a consideration when designing for weight restricted systems.
- Germanium crystal is subject to thermal runaway; the hotter it gets, the more the absorption increases. Pronounced transmission degradation starts at about 100°C and begins rapidly degrading between 200°C and 300°C, resulting in possible catastrophic failure of the optic.
- Germanium crystal is generally less expensive than ZnSe and Cleartran.
- Germanium crystal is diamond turnable.
Typeical application: Thermal imaging, FLIR (Forward Looking Infrared)
Products manufactured: Lenses, Aspheric Lenses, Binary (Diffractive) Lenses, Windows, Optical Beamsplitters, Optical Filters, Wedges.
OptoCity offer Germanium crystal as large as Dia. 300mm. Germanium manufactured products: Germanium Lenses, Windows, Optical Beamsplitters, Optical Filters, Wedges and other Germanium optical components according to customer's specifications and drawings.
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