Germanium (Ge) has high density and has excellent transmission features of blocking UV but transmitting infrared from 2µm-14µm. Germanium has high refractive index and low dispersion and is used as IR-transmitters in these wavebands so desirable for IR lens design where its high refractive index allows otherwise impossible specifications to be met.
Germanium transmits over 45% between 2-14µm up to 45°C so BBAR coatings are advisable as use of AR coatings increases transmission to over 80% between 3µm-14µm. Diamond like coating (DLC) are also applied for harsh environments.
Germanium lenses are typically used in thermal imaging cameras. Germanium lenses are useful for wide-angle lenses. Germanium is also used for FTIR (Fourier Transformed Infrared) and FLIR (Forward Looking Infrared) and spectroscopy systems.
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Specification: |
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Diameter: |
+0/-0.15mm |
| Centration: |
<6 arc minutes |
| Focal length: |
1-1.5% |
| Surface quality: |
60-40 scratch/ dig |
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