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Ge is a high refractive index material (4.0 @ 10 microns) with good long wavelength transmission in the infrared. At elevated temperatures the free carrier absorption becomes important and at 200 °C it is almost opaque. The high index permits very novel lens designs and ATR sampling of samples with high refractive index or high carbon black content.
Advantages
Disadvantages
Far-IR Transmission – 1 mm thick Ge window
Far-IR Transmission – 4 mm thick Ge window
WAVELENGTH (Microns) | INDEX |
---|---|
2.0581 | 4.1016 |
2.1526 | 4.0919 |
2.3126 | 4.0786 |
2.4374 | 4.0708 |
2.5770 | 4.0609 |
2.7144 | 4.0552 |
2.9980 | 4.0452 |
3.3033 | 4.0369 |
WAVELENGTH (Microns) | INDEX |
---|---|
3.4188 | 4.0334 |
4.258 | 4.0216 |
4.866 | 4.0170 |
6.238 | 4.0094 |
8.660 | 4.0043 |
9.720 | 4.0034 |
11.04 | 4.0026 |
12.00 | 4.0023 |
13.02 | 4.0021 |
Specific index listed; Generic: 4.00 @ 10 microns
Melting Point: 936 °C
Density: 5.33 g/cm3
Solubility in H2O: Insoluble
Hardness: 780 kg/mm2
Appearance: Metallic
Short Wavelength Limit: 5,500 cm-1 (1 mm)
Long Wavelength Limit: 432 cm-1 (1 mm), 574 cm-1 (4 mm)
The high refractive index of Ge permits design of BBAR coatings with greater than 98% transmission. It may also be coated to control depth of penetration in ATR applications.
Short and Long Wavelength Limits defined for which transmissivity is greater than 50% of stated crystal thickness.
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