Infrared Germanium Lens
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.
Optical Specifications of Germanium Lens
| 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 |
Transmittance of Antireflection coatings:
Germanium properties:
| 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 |
Infrared Elements Selection Guide
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?
For inventory: the delivery time is around 5 workdays.
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?
Yes, we can customize the material, specifications and optical coating for your optical components based on your needs. OEM is available.
Product Tags:
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IR Optical AR Coating 8-14um Single Crystal Germanium Lens For Thermal Imaging Images
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