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Uncoated Infrared Optical Lens Germanium Ge Lens For Defense / Security

Categories Infrared Optical Lens
Brand Name: Wuhan Siwer Optics
Place of Origin: Wuhan,China
MOQ: 2 pieces
Price: 25-200USD/piece
Payment Terms: T/T, Western Union
Supply Ability: 500 pieces/month
Delivery Time: 4-7 weeks
Packaging Details: 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler
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
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Uncoated Infrared Optical Lens Germanium Ge Lens For Defense / Security

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

MaterialSingle Crystal Germanium
AR Coating Range3-5um,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 Quality60-40 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 Wavelength10.6 μm


Transmittance of Antireflection coatings:


Germanium properties:

Chemical FormulaGe
Crystal FormPoly or Single Crystal
Crystal ClassCubic
Resistivity, Ohm*cm0.01-40
Lattice Constant, Å5.66
Molecular Weight72.6
Density, g/cm3 at 300 K5.33
Dielectric Constant for 9.37 x 109 Hz at 300 K16.6
Melting Temperature, K1210
Thermal Conductivity, W/(m K) at 293 K59
Thermal Expansion, 1/K at 298 K6.1 x 10-6
Specific Heat, cal/(g K) at 273-373 K0.074
Debye Temperature, K370
Bandgap, eV0.67
Solubility in waterNone
Knoop Hardness, kg/mm2800
Mohs Hardness6.3
Young's Modulus, GPa102.66
Shear Modulus, GPa67.04
Bulk Modulus, GPa77.86
Poisson's Ratio0.278


Infrared Elements Selection Guide

Production Process


Quality Uncoated Infrared Optical Lens Germanium Ge Lens For Defense / Security for sale
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