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UV, visible, infra-red optical materials... |
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...for optical lenses, windows, mirrors, filters & prisms |
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Germanium - Ge
lenses, windows, mirrors, filters and prisms
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Germanium has a high refractive index making
it essential to add anti-reflection coatings
to improve its transmission. It is inert, mechanically rugged and fairly
hard making it suitable for external Infrared applications with durable
AR coatings. Widely used in Infrared systems and as substrates for
optical bandpass filters in the region from 2-14 microns. Available
as generated lens blanks, polished windows, lenses and prisms with
AR coatings, including Hard Carbon coating. The transmission of Germanium
is very sensitive to temperature and above 70°C becomes opaque.
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| Transmission
Range |
1.8 - 23.0
µ |
| Crystal
Structure |
Diamond |
| Cleavage
Plane |
111 |
| Colour |
Metallic
lustre |
| Density |
5.327
(25°) |
| Melting Point
(°) |
942 |
| Reflection
Loss |
52.9%
(10µ) for 2 surfaces |
| Solubility
index |
Insoluble |
| Hardness
(Knoop) |
692 |
| Thermal
Conductivity (cal/cm sec°C) |
0.14
(20°C) |
| Thermal
Expansion coefficient (/°C) |
5.5x10-6(25°C) |
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Whilst every effort has been made to verify the data provided, no
responsibility can be accepted for its accuracy
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Global Optics UK Ltd, 30 Brockley Road, Bournemouth,
Dorset, UK, BH10 6JN.
Tel: 01202 530609,
Fax: 01202 547209
Company Registered in England
Registered Office: 30 Brockley Road, Bournemouth BH10 6JN
| Company No. 3509979
© Global Optics UK Ltd -
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