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Germanium
Monocrystal, N or P type, 5-40 ohm-cm

lenses, windows, mirrors, filters and prisms

Germanium effective IR optical window operation ranges from 3-5 microns and 8-12 microns. Germanium is popular for its high refraction, strength and thermal conductivity, widely used in lasers and imaging systems.

Transmission Range :

1.8 to 23 μm

Refractive Index :

4.0026 at 11 μm

Reflection Loss :

53% at 11 μm (Two surfaces)

Absorption Coefficient :

<0.027 cm-1 @ 10.6 μm

dn/dT :

396 x 10-6 /°C

Density :

5.33 g/cc

Melting Point :

936 °C

Thermal Conductivity :

58.61 W m-1 K-1 at 293K

Thermal Expansion :

6.1 x 10-6/°C at 298K

 
 
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