| Place of Origin: | Wuhan,China |
|---|---|
| Brand Name: | Wuhan Siwer Optics |
| Minimum Order Quantity: | 2 pieces |
| Price: | 25-200USD/piece |
| Packaging Details: | 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler |
| Delivery Time: | 4-7 weeks |
| Payment Terms: | T/T, Western Union |
| Supply Ability: | 500 pieces/month |
| Material: | Single Crystal Germanium | Size Tolerance: | +/-0.1mm |
|---|---|---|---|
| Chamfer: | 0.2-0.5mm | Surface Quality: | 40/20 |
| Surface Accuracy: | Lambda/2 In 25.4mm | Centration: | 3 Arc Min |
| Coating: | Uncoated | Size Range: | 5-300mm |
| Usage: | Infared System Protected Lens | ||
| High Light: | optical glass lens,optical instruments lens |
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Wavelength Range of 2 - 16μm
Rugged, Durable Material
Ideal for Defense, Security, and Thermal Imaging Applications
Additional Infrared Lenses Available in Popular Substrates
We will choose high quality single crystal Germanium material to make lens. The resistivity of germanium material is usually 5-40 ohms. We can also choose Germanium material with specified resistivity according to customer's requirements.
The production technology of germanium lens usually includes low-speed polishing, high-speed polishing and single point diamond turning techniques.
a) Low-speed polishing, also known as classical polishing, can produce germanium lenses with higher accuracy, but the production efficiency is very low and the cost is relatively high.
b) High-speed polishing can make germanium lens quickly. It is the best choice in mass production. It has lower production cost.
c) Single point diamond turning techniques can make germanium lens with arbitrary curved surface, and single point car can also be selected for small batch germanium lens samples.
According to the customer's use scenario, we will recommend suitable germanium lens for customers and choose the best solution.
| 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 |
| Focal Length Tolerance | ±2% |
| Surface Quality | 60-40 Scratch-Dig |
| Surface Flatness (Plano Side) |
λ/2 at 633nm |
| Spherical Surface Powerc (Convex Side) |
1.5λ at 633nm |
| Surface Irregularity (Peak to Valley) |
λ/2 at 633nm |
| Centration | <3 arcmin |
| 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
