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Taixing Hechen Crystal Technology Co., Ltd
Germanium single crystal window plate
NegotiableUpdate on 05/19
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Overview
Germanium (Ge) single crystal is a chemically inert material with a transmission spectrum range of 2-12 μ m, and is a commonly used infrared optical material. It has the characteristics of high hardness, good thermal conductivity, and insolubility in water. Widely used in infrared imaging systems and infrared spectrometer systems. Germanium single crystal has good mechanical and thermal properties, with very low absorption at 10.6 μ m. The window processed with germanium single crystal is CO2 laser, and it can also be used to make substrates for various filters
Product Details
| Machinable shape | Circular, rectangular, polygonal, and other shapes |
| size range | Diameter (maximum diagonal): Φ 8- Φ 60mm |
| Thickness: 0.05-50mm | |
| facial shape | Reflected PV better than 1/4 λ, transmitted PV better than 1/10 λ |
| surface finish | 10-5 20-10 40-20 |
| surface roughness | Less than 5nm |
| parallelism | Less than 20 inches |
| coating | Customized coating can be made according to customer requirements |
Germanium (Ge) single crystal is a chemically inert material with a transmission spectrum range of 2-12 μ m, and is a commonly used infrared optical material. It has the characteristics of high hardness, good thermal conductivity, and insolubility in water. Widely used in infrared imaging systems and infrared spectrometer systems. Germanium single crystal has good mechanical and thermal properties, with very low absorption at 10.6 μ m. The window processed with germanium single crystal is CO2 laser, which can also be used to make substrates for various filters
The application of germanium in infrared optics is mainly used to manufacture infrared optical lenses and protect the infrared optical windows of infrared optical lenses. More than 60% of mid to low end infrared optical lenses are made of germanium single crystal, and 50% of infrared optical lenses are made of germanium single crystal. Germanium material is widely used in infrared lenses. In civilian infrared lenses, a single set of small and medium aperture lenses consumes about 250 grams of germanium, while a large aperture lens consumes about 2500 grams.
Infrared windows are mainly used in aircraft and armored vehicles, especially in helicopters where they are widely used. The applications of infrared optical lenses include military and civilian use. In military applications, they are mainly used in airborne infrared lenses, shipborne infrared lenses, roadbed infrared lenses, vehicle mounted infrared lenses, infrared lenses, helmet infrared lenses, handheld infrared lenses, etc.
The civilian infrared window is mainly used in various monitoring thermal imagers and night driving assistance cameras. In the civilian field, it is mainly used in security, civilian vehicles, civilian ships, civilian aircraft, etc.
Through the curve
Physicochemical properties
| Density (g/cm3) | 5.33 |
| Melting point (℃) | 936 |
| Static dielectric constant/high frame rate | 16.6@9.37GHz （300K） |
| Thermal expansion coefficient (1/℃) | 6.1*10^ -6@298K |
| Modulus of elasticity (GPa) | 77.2 |
| Shear modulus (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 |
optical properties
| By wavelength range | 2000nm-12000nm |
| Absorption coefficient (1/cm) |
|
| Thermal optical coefficient, dn/dT（1/K） | 4.08*10^ -4@10600nm |
Variation of refractive index with wavelength
| Wavelength (nm) | Refractive index (n) | 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 |
