Germanium
Germanium Aspheric Lenses
Germanium aspheric lenses for compact LWIR thermal imaging optics, with drawing-based diameter, thickness, coating, and focal design review.
germanium-aspheric-lenses
Germanium (Ge)
Germanium (Ge) optical material for LWIR thermal imaging and sensing, with selection guidance for custom windows, lenses, and protective optics.
Key Properties
Transmission Range: 2 - 14 µm
Refractive Index: 4.0028 at 10.6 μm
Density: 5.33 g/cm3
Knoop Hardness: 780 kg/mm2
About Germanium (Ge)
Overview
Germanium (Ge) is used for LWIR thermal imaging and sensing where a high-index IR material is needed for compact optical layouts and protective windows. It is commonly reviewed for custom windows, lenses, and coated IR assemblies.
Key Material Properties
| Parameter | Guidance |
|---|---|
| Transmission Range | 2-14 μm |
| Refractive Index | 4.0028 at 10.6 μm |
| Density | 5.33 g/cm3 |
| Knoop Hardness | 780 kg/mm2 |
| Young's Modulus | 102.7 GPa |
| Thermal Expansion | 6.1*10^-6/K @298 K |
Typical Applications
- LWIR thermal imaging lenses
- Germanium windows
- Infrared camera optics
- High-index IR systems
- DLC-coated protective optics
Selection Guidance
Germanium is dense and high-index, so coating design, mounting, and thermal behavior should be reviewed carefully. Use the values on this page as engineering selection guidance, then confirm final tolerances and inspection requirements against the production drawing.
Request Material Review
Use the contact form or email [email protected] with wavelength band, size, quantity, coating target, and application notes for a practical material review.
Material Properties
Material
Germanium (Ge)
Transmission Range
2-14 μm
Refractive Index
4.0028 at 10.6 μm
Density
5.33 g/cm3
Knoop Hardness
780 kg/mm2
Young's Modulus
102.7 GPa
Thermal Expansion
6.1*10^-6/K @298 K
Common Applications
LWIR thermal imaging lensesGermanium windowsInfrared camera opticsHigh-index IR systemsDLC-coated protective optics
Germanium (Ge) Products
Germanium
Germanium Optics
Germanium Optics for LWIR thermal imaging, with Germanium material, custom size review, and coating options.
germanium-general-optics
Germanium
Germanium Plano-Convex Lenses
Germanium plano-convex lenses for MWIR and LWIR thermal imaging, IR thermometry, sensing, monitoring, and custom infrared optical assemblies.
germanium-plano-convex-lenses
Germanium
Germanium Windows
Germanium Windows for LWIR thermal imaging windows and sensor protection, with Germanium material, custom size review, and coating options.
germanium-windows