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IR Materials
 Many different types of material will transmit
infra-red.
Selection of the most appropriate material is usually
made with reference to the extent of the required transmittance and the nature
of the environments being isolated by the window.
Zinc Selenide (ZnSe), Zinc Sulphide (ZnS), Germanium
(Ge) or Gallium Arsenide (GeAs) are commonly used for the broad IR spectrum
including both 3-5µm and 8-14µm bands.
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Calcium Fluoride and Magnesium Fluoride are used in the 3-5
µm band while maintaining high transmittance in the visible. Here are
some of the commonly available materials: |
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Material |
Transmission Range (µm) |
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ZnSe |
0.68~18.0 |
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ZnS |
0.38~14.0 |
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Ge |
1.90~16.0 |
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Si |
1.20~7.00 |
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CaF2 |
0.17~7.80 |
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MgF2 |
0.13~7.00 |
Typical diameters offered are: 6.35, 10.0, 12.7, 25.4,
38.1, 50.8, 76.3 and 200mm.
Thickness varies from 1.0 to 6.0 mm as appropriate, to
maintain the flatness specification.
These windows are normally supplied uncoated but we can
can also arrange to have them coated to your specification.
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