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High Precision Single Crystal Germanium Windows With AR And DLC Coatings

Name: High Precision Single Crystal Germanium Windows With AR And DLC Coatings
Brand: Wuhan Siwer Optics
Price: 25 USD

Quality High Precision Single Crystal Germanium Windows With AR And DLC Coatings wholesale

Place of Origin : Wuhan,China

MOQ : 5 pieces

Price : 25-98USD/piece

Payment Terms : T/T, Western Union

Supply Ability : 3000 pieces/month

Delivery Time : 3-4 weeks

Packaging Details : 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler

Brand Name : Wuhan Siwer Optics

Material : Single Crystal Germanium

Size tolerance : +/-0.1mm

Chamfer : 0.2-0.5mm

Surface quality : 40/20

Surface flatness : Lambda/4 in 25.4mm

Parallelism : 0.01mm

Standard coating : AR/AR@8-14um

Size range : 5-300mm

Usage : Infared system

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Infrared Germanium window

The transmittance range of the optical germanium material is 2-14 um, and the refractive index is as high as 4. Germanium lens and germanium window are widely used in thermal imaging system.
Germanium window is a common protective window in infrared imaging system. Its material quality, surface smoothness, parallelism, surface quality and coating quality will directly affect the imaging effect.
The resistivity of optical grade single crystal germanium material we choose is usually 5-40 Ohms. If the customer requests, we can also choose germanium material with specified resistivity.
Due to the high refractive index and high surface reflectivity of germanium (r > 30%), optical germanium windows usually need AR coating on its surface.
If the equipment is used in a bad environment, the outer side of the germanium protection window needs to be coated with DLC Coating.DLC Coating has excellent wear resistance, acid resistance and corrosion resistance.

Optical Properties of Germanium Window

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
Parallelism	3 arc min
Surface Quality	60-40 Scratch-Dig
Surface Flatness (Plano Side)	λ/2 at 633nm
Surface Irregularity (Peak to Valley)	λ/2 at 633nm
Clear Aperture	>Ø10.16 mm (Ø1/2" Lenses) >Ø20.32 mm (Ø1" Lenses)
Design Wavelength	10.6 μm

Transmittance of Antireflection coatings:

High Precision Single Crystal Germanium Windows With AR And DLC 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

High Precision Single Crystal Germanium Windows With AR And DLC Coatings

Production process

High Precision Single Crystal Germanium Windows With AR And DLC Coatings

Product Tags:

optical window

infrared system protectd window

High Precision Single Crystal Germanium Windows With AR And DLC Coatings Images

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