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 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.
Specifications
Transmission Range
1.8 to 23 ¥ìm
Reflection Loss
5.3% @ 11¥ìm (Two surfaces)
Absorption Coefficient
< 0.027 cm-1 @ 10.6 ¥ìm
Refractive Index
4.0026 @ 11 ¥ìm
Melting Point
936 ¡ÆC
Hardness
Knoop 780
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