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Optical Plano Convex Lenses Germanium Material for Thermal Imaging Applications

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Optical Plano Convex Lenses Germanium Material for Thermal Imaging Applications

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Brand Name : Wuhan Siwer Optics

Place of Origin : Wuhan,China

MOQ : 5 pieces

Price : 25-200USD/piece

Payment Terms : T/T, Western Union

Supply Ability : 1000 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

Standard coating : AR/DLC@8-14um

Size range : 5-300mm

Usage : Infared system protected Lens

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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 Plano Convex Lenses Germanium Material for Thermal Imaging Applications Optical Plano Convex Lenses Germanium Material for Thermal Imaging Applications

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:

Optical Plano Convex Lenses Germanium Material for Thermal Imaging ApplicationsOptical Plano Convex Lenses Germanium Material for Thermal Imaging Applications

Optical Plano Convex Lenses Germanium Material for Thermal Imaging ApplicationsOptical Plano Convex Lenses Germanium Material for Thermal Imaging Applications

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

Optical Plano Convex Lenses Germanium Material for Thermal Imaging Applications


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