| Place of Origin: | Wuhan,China |
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| Brand Name: | Wuhan Siwer Optics |
| Minimum Order Quantity: | 1 pieces |
| Price: | 25-100USD/piece |
| Packaging Details: | 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler |
| Delivery Time: | 3-5 weeks |
| Payment Terms: | T/T, Western Union |
| Supply Ability: | 3000 pieces/month |
| Material: | Single Crystal Germanium | Size Tolerance: | +/-0.1mm |
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| Chamfer: | 0.2-0.5mm | Surface Quality: | 40/20 |
| Surface Flatness: | Lambda/4 | Parallelism: | 0.01mm |
| Standard Coating: | AR/DLC@8-14um Or Customized | Density: | 5.33g/cm3 |
| Usage: | Infared System Protected Window | Clear Aperture: | 90% |
| High Light: | ir window,optical window |
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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. |
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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. |
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What's the deliver time? Customized products: the delivery time is 10 to 30 workdays. According to the quantity and precision. |
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Can I customize the products based on my need? based on your needs. OEM is available. |
