Active Member
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[China]
Address: Building 7, No. 116, Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province
Contact name:Jason
Wuhan Siwer Optics Co.,Ltd |
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Sometimes, our customers need to customize special germanium
windows for their new products. Our customized germanium windows
can meet their needs very well.
The transmittance range of the optical germanium material is 2-14
um, and the refractive index is as high as 4. Germanium lens and
germanium window are widely used in thermal imaging system.
Germanium window is a common protective window in infrared imaging
system. Its material quality, surface smoothness, parallelism,
surface quality and coating quality will directly affect the
imaging effect.
The resistivity of optical grade single crystal germanium material
we choose is usually 5-40 Ohms. If the customer requests, we can
also choose germanium material with specified resistivity.
Due to the high refractive index and high surface reflectivity of
germanium (r > 30%), optical germanium windows usually need AR
coating on its surface.
If the equipment is used in a bad environment, the outer side of
the germanium protection window needs to be coated with DLC
Coating.DLC Coating has excellent wear resistance, acid resistance
and corrosion resistance.
| Material | Single Crystal Germanium |
| AR Coating Range | 3-5um,8-12um,3-11um |
| Reflectance over AR Coating Range @ 0° AOI | Ravg < 2%,3-5um or 8-12um Ravg<5%,3-11um |
| Transmission over AR Coating Range @ 0° AOI | Tavg > 94%,3-5um or 8-12um |
| Diameter Tolerance | +0.0/-0.1 mm |
| Thickness Tolerance | ±0.1 mm |
| Parallelism | 3 arc min |
| Surface Quality | 60-40 Scratch-Dig |
| Surface Flatness (Plano Side) | λ/2 at 633nm |
| Surface Irregularity (Peak to Valley) | λ/2 at 633nm |
| Clear Aperture | >Ø10.16 mm (Ø1/2" Lenses) >Ø20.32 mm (Ø1" Lenses) |
| Design Wavelength | 10.6 μm |
| Chemical Formula | Ge |
| Crystal Form | Poly or Single Crystal |
| Crystal Class | Cubic |
| Resistivity, Ohm*cm | 0.01-40 |
| Lattice Constant, Å | 5.66 |
| Molecular Weight | 72.6 |
| Density, g/cm3 at 300 K | 5.33 |
| Dielectric Constant for 9.37 x 109 Hz at 300 K | 16.6 |
| Melting Temperature, K | 1210 |
| Thermal Conductivity, W/(m K) at 293 K | 59 |
| Thermal Expansion, 1/K at 298 K | 6.1 x 10-6 |
| Specific Heat, cal/(g K) at 273-373 K | 0.074 |
| Debye Temperature, K | 370 |
| Bandgap, eV | 0.67 |
| Solubility in water | None |
| Knoop Hardness, kg/mm2 | 800 |
| Mohs Hardness | 6.3 |
| Young's Modulus, GPa | 102.66 |
| Shear Modulus, GPa | 67.04 |
| Bulk Modulus, GPa | 77.86 |
| Poisson's Ratio | 0.278 |
Production process
| What's the way of shipping? We accept DHL, Fedex, TNT, UPS, SF, EMS etc. If you have your own express account, it's great. |
How to pay? (1) T/T, PayPal, West Union,etc (2) Bank Fee: West Union-USD30.00(≤USD3000.00), T/T-USD20.00+, PayPal-5%. Please consult the local bank. |
What's the deliver time? Customized products: the delivery time is 10 to 30 workdays. According to the quantity and precision. |
Can I customize the products based on my need? based on your needs. OEM is available. |
