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germanium ir window
germanium ir window

Germanium Single Window Crystals

Germanium single crystals are ideal for infrared spectrum applications for its broad transmission range and opacity in the visible portion of the spectrum. Germanium is commonly used in infrared (IR) thermal imaging systems operating in the 2 µm to 14 µm spectral range and covers both the LWIR and MWIR spectrum. Ge windows are relatively more rugged than other infrared (IR) materials,  it is often used as protective windows for thermal cameras, or long-pass filters for wavelengths above 2000nm. Germanium also has the virtues of high chemical inertness and low chromatic aberration. But germanium would begin to become opaque in the IR spectrum when the temperature rises above 90℃, one should take caution when it is used in high-temperature applications.

Applications of Germanium Single Window Crystals


  • Infrared optical components

  • Nuclear detection

  • Solar battery


Advantages of Germanium Single Window Crystals


  • Uncoated or with AR Coatings Designed for a Variety of IR Ranges

  • Minimal Chromatic Aberration Due to Low Dispersion

  • Ideal for Infrared Applications Requiring Rugged Optics


Specifications of Germanium Single Window Crystals


Orientation

Random or as requested

Size

Upon the customer’s request

Diameter Tolerance

+0/-0.1 mm

Thickness Tolerance

+/-0.1 mm

Aperture

>90%

Surface Quality

80/50~10/5 (S/D)

Parallelism

<1 arc minute

Chamfer

0.2-0.5mmx45°

Coating

Uncoated or upon customer’s request


Properties of Germanium Single Window Crystals


Transmission Range

1.8 to 23 microns

Refractive Index

4.0026 at 11 micron

Refractive Loss

53% at 11 microns

Crystal/Class Structure

Cubic Diamond, Fd3m

Cleavage Plane

(111), non-perfect

Density

5.33 g/cc

Hardness

Knoop 780

Youngs Modulus

108.7 GPa

Shear Modulus

67 GPa

Bulk  Modulus

77.2 GPa

Poisson Ratio

0.28

Elastic Limit

89.6 MPa(13000psi)

Molecular Weight

72.59

Thermal Expansion

6.1×10^-6 / ℃ at 298K

Thermal Conductivity

58.61W m-1K-1 at 293K

Melting Point

936 ℃

Specific Heat Capacity

310 J Kg-1K-1

Solubility

Insoluble in water


Technical Images of Germanium Single Window Crystals

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Contact Us
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Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
sales@ostphotonics.com; info@ostphotonics.com +86-0571-86780460