Germanium Longpass Filters PGeWA8002
Germanium long wave pass filter is a special optical device. The transparent band of the germanium substrate is between 2-12 μ m, and after exceeding 12 μ m, the transmittance begins to decrease and the absorption gradually increases. In the 5-12 μ m wavelength range, the absorption of germanium substrates is relatively small, making them advantageous for coating. Its working principle is based on optical interference and diffraction. When light passes through a filter, it interacts with the internal structure of the filter. Due to the different wavelength energy relationships of light, their interaction with the filter structure will also vary. Usually applied in fields such as biomedical, environmental monitoring, and geological exploration.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Diameter | 8 inch |
| Thickness | 275-1000 μm |
| Orientation | <111> |
| Substrate Material | Germanium（Ge） |
| Conductivity Type | N/P |
| Diameter Tolerance | ±0.2 mm |
| Thk Tolerance | ±10 mm |
| Orientation Tolerance | ±1° |
| Resistance | 10-1000 Ω.cm |
| TTV | <10 μm |
| BOW | <30 μm |
| WARP | <30 μm |
| Transmission Range [Substrate Material：Germanium（Ge）] | 2-15μm |
| Reflection Loss [Substrate Material：Germanium（Ge）；@10.6μm] | 4.0028@10.6μm |
| Absorption Coefficienet [Substrate Material：Germanium（Ge）；@3.8μm] | 1.3×10⁻³@3.8μm |
| Absorption Coefficienet [Substrate Material：Germanium（Ge）；@10.6μm] | 3×10⁻²@10.6μm |
| Structure [Substrate Material：Germanium（Ge）] | Cubic Crystal System |
| Cleavage Planes [Substrate Material：Germanium（Ge）] | <111> |
| Density [Substrate Material：Germanium（Ge）] | 5.33 g/cm³ |
| Melting Point [Substrate Material：Germanium（Ge）] | 936 ℃ |
| Thermal Conductivity [Substrate Material：Germanium（Ge）；@293K] | 58.61 @ 293K |
| Thermal Expansion [Substrate Material：Germanium（Ge）；@298K] | 6.1 @ 298K |
| Knoop Hardness [Substrate Material：Germanium（Ge）] | 780 kg/mm² |
| Specific Heat Capacity [Substrate Material：Germanium（Ge）] | 310 J/(kg×K) |
| Dielectric Constant [Substrate Material：Germanium（Ge）；@9.37 GHz] | 16.6 @9.37 GHz |
| Young's Modulus (E) [Substrate Material：Germanium（Ge）] | 102.7 GPa |
| Shear Modulus(G) [Substrate Material：Germanium（Ge）] | 67 GPa |
| Bulk Modulus(K) [Substrate Material：Germanium（Ge）] | 77.2 GPa |
| Poisson Coefficient [Substrate Material：Germanium（Ge）] | 0.28 |
| Solubility [Substrate Material：Germanium（Ge）] | Inoluble |
| Molecular Weight [Substrate Material：Germanium（Ge）] | 72.61 g/mol |
Applications
Datasheet
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