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Germanium Optical Windows have good transmittance from 2 to 16 µm uncoated, and very low peak absorption, making the material an excellent candidate for use in C02 laser cavities. Germanium also has high opacity across the entire visible spectrum, making the windows ideal for applications where transmission of IR wavelengths only is desired.
Chemical Formula | Ge |
Crystal Form | Monocrystal, orientation <111>, N-type |
Crystal Class | Cubic |
Resistivity, Ohm*cm | 5-40 |
Lattice Constant, Å | 5.66 |
Molecular Weight | 72.60 |
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 K-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 |



a: Dimesion size : 5-300mm , thickness up to customer requirements
b: Many material could be choosed, like BK7, Fused Silica, Sapphire, MgF2, CaF2, Ge, Si, Znse, ZnS and so on.
c: AR HR DLC coating or as your request
For more please visit our website: www.wheo.cn
Packing Details: First layer Tissue paper, then Protective film or Capacitor paper, Pearl cotton, Cardboard box.
Delivery Details: 7 days for stock.
3-4 weeks for custom-made products.
in common, ≥4 weeks for mass production.

What's the way of shipping?
We commonly use UPS, FedEx, DHL, TNT, SF, EMS etc. If you have your own express account, it's great.
How to pay?
We usually use Trade Assurance Order to protect your privilege and you can choose the most convenient terms in this way.
What's the deliver time?
For inventory: generally within 5 workdays.
Customized products: typically 30 days.
How to ensure the safety of payment?
Can I customize the products based on my need?
Sure, we can customize most optics upon your unique demands. OEM and ODM is also available.

Wuhan Especial Optic Inc.
Contact: David Liu
Tel: +86-027-87504830
WhatsApp: +86-18622556450
Email: sales@wheo.cn
Website: www.wheo.cn
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