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AR/DLC coating Germanium Ge glass optical window for FLIR and thermal camera
AR/DLC coating Germanium Ge glass optical window for FLIR and thermal camera
AR/DLC coating Germanium Ge glass optical window for FLIR and thermal camera
AR/DLC coating Germanium Ge glass optical window for FLIR and thermal camera
AR/DLC coating Germanium Ge glass optical window for FLIR and thermal camera
AR/DLC coating Germanium Ge glass optical window for FLIR and thermal camera
AR/DLC coating Germanium Ge glass optical window for FLIR and thermal camera

AR/DLC coating Germanium Ge glass optical window for FLIR and thermal camera

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Product Overview

Description





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Product Parameters




Physical Properties















Germanium
Density
5.325/cm3
Hardness
800kg/cm2
Young's Modulus(Gpa)
100
103.3
110
138
111
155.5
Thermal Conductivity
59.9
Thermal Expansion Coefficient
6.0 x10-6
Specific Heat Capacity
322
Dielectric Constant
16
Melting Point
937.4℃
Crystal Structure
Monocrystalline 1 Polycrystalline
Purity
>99.999%
Conductivity Type
N
Resistivity
0.005-50 Ω • CM
Poisson's Ratio
0.278
Modulus of Rupture ( Mpa)
72.4
Surface Finish
Ramax 0.2 μm to 4.0 μm


Optical Properties












Germanium
Transmission Spectrum, ( μm)
2-14 μm
Temperature Coefficient of Refractive Index
400x10-6
Refractive Index
4.0052
Refractive Index Homogeneity
≤1.0+10-4
Absorption Coefficient @ 10.6 μm
≤0.035
Transmittance
Resistivity
Wavelength Range
Transmittance
1.1-1.3 Ω
2-11.5 μm
43.92%-46.47%
1.3-1.6 Ω
2-11.5 μm
44.40%-47.54%
1.4-1.5 Ω
2-11.5 μm
44.31 %-46.22%
2.9-3.3 Ω
2-11.5 μm
44.69%-46.25%
3.0-3.8 Ω
2-11.5 μm
45.31 %-46.73%
4.4-4.8 Ω
2-11.5 μm
44.64%-46.52%
7.0-19 Ω
2-11.5 μm
45.20%-46.20%
17.7-17.9 Ω
2-11.5 μm
46.08%-46.70%
Silicon
24-32 Ω
/
51.19%-52.11%
38.2-38.9 Ω
/
52.48%-53.71%


Formats/Sizes/Tolerances （mm)





Ge Disks
Diameter
Mono Crystal
3-320
Poly Crystal
3-400
Diameter Tolerance
≤ 0.05
Minimum Thickness
0.3
Maximum Thickness
75
Thickness Tolerance
≤0.05



Ge Rectangular
Maximum Size
250x250
Tolerance
0.1
Minimum Thickness
0.1 (Φ < 100 )
Thickness Tolerance
0.02



Ge Lenses
Diameter
7-360
Diameter Tolerance
0.04
The Radius of Curvature Tolerance
Δ Sag < 0.005
Center Thickness Tolerance
≤ 0.03
Edge Thickness Variation (ETV)
≤0.03


Properties
Germanium belongs to the first Ⅳ main group elements with the structure of the diamond. Germanium have excellent physical and chemical properties, its main applications in semiconductor materials, infrared optical materials, chemical catalyst, medical applications and other fields, especially used as a kind of excellent infrared optical material.

High purity germanium has a high refractive index and is high transparency to infrared radiation. It can not pass through visible and ultraviolet ray.

Germanium has excellent transmission across 2-14um waveband and can be used in both mid-wave infrared and long-wave infrared systems.

When Germanium is used as an infrared material, it can be produced to Optical Grade Germanium blank, windows, lenses which is used in Infrared detection and imaging system


Application
Germanium Single crystal products include solar grade germanium single crystal, infrared grade germanium single crystal and detector grade germanium single crystal.

Infrared grade Germanium single crystal is most widely used infrared optical lens and infrared optical window which protect infrared optical lens in thermal-imaging systems.

60% of middle and low infrared optical lenses and 50% of high-end infrared optical lenses are made by Germanium single crystal. Germanium materials are widely used in infrared lenses.

Civil infrared window is mainly used in a variety of monitoring thermal imager, night assistance pilot. The civil domain mainly uses in the security, the civil vehicle, the civil vessel, the civil aircraft and so on.


Germanium metal and related products
1, Solar grade germanium wafers
2, Germanium monocrystals (Polycrystal)
3, Germanium dioxide (GeO2)
4, Organic germanium
5, Zone melting germanium ingots
6, Germanium granule


Technical parameter of Germanium optical grade Monocrystals/Polycrystals


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