Description
Germanium in the application of infrared optics, is mainly used to produce the infrared optical lens and protect the IR optical window of the infrared optical lens. More than 60% of the mid-range infrared optical lens for single crystal germanium, 50% of high-end infrared optical lens for single crystal germanium, germanium materials are widely used in the infrared camera. Civil infrared camera, small and medium caliber lens single set of germanium consumption about 250 grams, large diameter is 2500 grams.
Military infrared window is mainly used in aircraft and armored fighting vehicles, especially a helicopter dosage big infrared optical lens applications include military and civilian applications, mainly used in military airborne infrared camera, IR camera, roadbed infrared lens, vehicular infrared camera, infrared gun aiming lens, helmet infrared camera, handheld infrared camera, etc.
Civil infrared window is mainly used in a variety of monitoring thermal imager, auxiliary pilot at night. Civilian areas mainly used in security, civilian vehicles, civilian ships, civilian aircraft, police, etc.
| Basic Properties: | Gemanium (Ge) |
| Transmission band(μm) | 1.8-23 |
| Uniformity index | 4.89×10-5(φ250mm) |
| Refractive index(10µm) | 4.0032 |
| Temperature coefficient of the refractive index(10-6/℃) | 408 |
| Absorption(10µm.cm-1) | 0.03 |
| Hardness(kg/cm2) | 800 |
| Density(g/cm3) | 5.323 |
| Rupture Modulus (Mpa) | 75 |
| Yang’s modulus(Gpa) | 103 |
| Poisson’s ratio | 0.28 |
| Melting point(℃) | 937 |
| Thermal conductivity(Wcm-1k-1) | 0.7 |
| Thermal expansion coefficient(X10-6℃C-1) | 6.1 |
| Specific Heat(Cal/g.k.) | 0.074 |
| Permittivity | 16 |
| Conductive models | N |
| Resistivity(Ωcm) | 5-40 |
| Maximum diameter(mm) | 300 |
| 1 | Centre | <3 arc minutes |
| 2 | Flatness | 1/4λ-10λper inch @633nm |
| 3 | Surface quality | 5-10/60-40 |
| 4 | Tolerance | ±0.02-±0.1 |
| 5 | Chamfer | 0.1-0.5*45°C |
