10um Ga Doped Germanium Substrate Ge Window For Infrared Co2 Lasers
Among optical materials, germanium materials are increa […]
Among optical materials, germanium materials are increasingly widely used in infrared and night vision technologies. Germanium belongs to the IV main group element and has a diamond structure. Germanium has relatively superior physical and chemical properties. It is mainly used in semiconductor materials, infrared optical materials, chemical catalysts, medical applications and some other new use fields, especially as an excellent of infrared optical materials used.
Germanium is insoluble in water, chemically stable, and it is opaque in the visible light region. Germanium has good permeability to microwaves. Germanium is a relatively brittle material and has poor mechanical shock resistance. When germanium is used as an infrared material, the processing focus is to ensure that the surface of the material has a high finish and good transmittance. Compared with optical glass, germanium has certain advantages in mechanical properties, so germanium crystal is selected as the processing material for turning technology for experiments. After many experiments, using germanium crystal as optical processing material and ordinary CNC lathe as processing equipment, a set of turning process has been developed to replace the traditional optical parts processing and grinding process. labor efficiency.
| Item | Y/N | Item | Y/N | Item | Y/N |
| Germanium crystal | yes | Electronic Grade | yes | N type | yes |
| Germanium blank | yes | Infrared Grade | yes | P type | yes |
| Germanium substrate | yes | Cell Grade | yes | Undoped | ye |
| Thermal properties: | |
| Thermal Expansion | 5.9 x 10-6 °C -1 @ 300K |
| Melting Point | 937°C |
| Thermal diffusivity | 0.36 cm2s-1 |
| Thermal conductivity | 0.58 W cm-1 °C-1 |
| Specific heat | 0.31 J g-1 °C-1 |
| Mechanical properties: | |
| Young Modulus | 10.3×1011 dyn cm-2 @ 300K |
| Shear Modulus | 4.1x 1011 dyn cm-2 |
| Knoop Hardness | 780 kg mm-2 |
| Poisson constant | 0.26 |
| Electrical properties: | |
| Di-electric constant | 16.2 |
| Resisitivity | 9.0 ohm cm |
| Optical properties: | |
| Transmission | 2 – 14μm fino a circa 45° |
| Refractive Index | 4.025 @ 4μm |
| 4.005 @ 10μm |
Germanium’s wide spectral operating range (2-16µm) and opacity in the visible spectral range make germanium well suited for infrared laser applications.
It also does not react easily with air, water, alkali metals and acids (except nitric acid). (Processing size: Φ5-Φ150)
Germanium Substrate Ge Window Application
Germanium lenses are mainly used in infrared thermometers, infrared thermal imagers, infrared lenses, Co2 lasers and other equipment.
Germanium Substrate Ge Window Advantage
Shanghai Xinkehui New Material produces germanium lenses, which use optical-grade single-crystal germanium as the base material and are processed with a new polishing technology.
High surface precision, 8-14μm anti-reflection film will be coated on two sides of germanium lens, which can greatly reduce the reflectivity of the substrate and enhance the anti-reflection effect.
The transmittance of the membrane working band reaches more than 95%. mpurity level less than 10³ atoms/cm³
Material : Ge Growth : CZ
Grade : Prime grade
Type/dopant : Type-N, undoped
Orientation : [100] ±0,3º
Diameter : 100,0 mm ±0,2 mm
Thickness : 500 µm ±25 µm
Flat : 32 mm ±2 mm @ [110]±1º
Resistivity : 55-65 Ohm.cm
EPD : < 5000
Front side : Polished (epi-ready, Ra <0,5 nm)
Back side : Ground/etched
TTV : <10; BOW :<10; WARP :<15um;
Particles : 0.3
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