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| Shape | Circles, rectangles, polygons and other shapes |
| Size | Diameter：Φ8-Φ80mm |
| Thicness：0.05-50mm | |
| Flatness | PV:1/4-1/10λ |
| Finish | 10-5 20-10 40-20 |
| Roughness | ＜5nm |
| Parallelism | ＜20″ |
| Coatting | Custom |
Germanium (Ge) single crystal is a chemically inert material with a transmission spectrum ranging from 2 to 12μm. It is a common infrared optical material. It has the characteristics of high hardness, good thermal conductivity and insoluble in water. It is widely used in infrared imaging system and infrared spectrometer system. Germanium single crystal mechanical properties and thermal conductivity is good, at 10.6μm absorption is very small, with germanium single crystal processing window is the first choice for CO2 laser, can also be used to make a variety of filter substrate.
The application of germanium in infrared optics is mainly used to make infrared optical lens and infrared optical window to protect the infrared optical lens. More than 60% of the middle and low end infrared optical lenses are made of germanium single crystal, and 50% of the high-end infrared optical lenses are made of germanium single crystal. Germanium material is widely used in infrared lenses. In the civil infrared lens, the germanium consumption of small and medium caliber lens is about 250 grams, and the large caliber lens is about 2500 grams.
Civil infrared window is mainly used in a variety of monitoring thermal imagers, night-time auxiliary pilot. The civil field is mainly used in security, civil vehicles, civil ships, civil aircraft, police and so on.
Physicochemical property
| Ddensity（ g/cm3） | 5.33 |
| Melting temperature（℃） | 936 |
| Dielectric constant Static/high frame | 16.6@9.37GHz（300K） |
| Thermal expansivity（1/℃） | 6.1*10^-6@298K |
| Elasticity modulus（GPa） | 77.2 |
| Shear elasticity（GPa） | 67 |
| Thermal conductivity | 58.61@293K |
| Thermal capacity（J/k.m.s） | 0.31 |
| knoop hardness(kg/mm2) | 780 |
| Young's modulus(GPa) | 102.7 |
| Poisson's ratio | 0.28 |
| Elastic coefficient | C11=129 C11=48.3 C11=67.1 |
Optical property
| Through wavelength range | 2000nm-12000nm |
| Absorptivity（1/cm） |
|
| Thermo-optical coeffecient ，dn/dT（1/K） | 4.08*10^-4@10600nm |
Refractive index as a function of wavelength
| The wavelength（nm） | Refractive index（n） | The wavelength（nm） | Refractive index（n） |
| 2200 | 4.0879 | 8000 | 4.0057 |
| 3000 | 4.0451 | 9000 | 4.0040 |
| 3800 | 4.0267 | 10600 | 4.0028 |
| 5000 | 4.0160 | 11000 | 4.0025 |
| 6000 | 4.0107 | 12000 | 4.0021 |
| 7000 | 4.0079 | 13000 | 4.0018 |
