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Potassium Bromide (KBr)
Potassium Bromide is used for windows and prisms when transmission to 26µm is desired. Potassium Bromide is water soluble and must be protected against moisture degradation of polished surfaces.
The material cleaves readily, and can be used at temperatures up to 300°C. UV irradiation of Potassium Bromide produces color centers.
| Property |
Specification |
| Transmission Range |
0.23µm to 25µm |
| Density |
2.75451
gm/cm3 |
| Thermal Expansion |
43 x 10-6 /°C |
| Surface Finish |
Generally 60-40 or 80-50 scratch-dig in the Infrared. |
| Surface Figure |
Generally λ/20 @ 10.6µm |
| AR Coating Options |
Moisture Protection (Specify Wavelength of Use). |
| Typical Applications |
IR Spectroscopic components, beamsplitters, CO2 lasers. |
| Products Manufactured |
Windows, Lenses, Lens Protectors, Wedges, Aspheric Lenses. |
|
Wavelength (µm)
|
Index of Refraction (n)
|
|
2.440
|
1.537
|
|
4.258
|
1.535
|
|
6.692
|
1.532
|
|
8.662
|
1.529
|
|
9.724
|
1.527
|
|
11.862
|
1.522
|
|
14.290
|
1.515
|
|
17.400
|
1.504
|
|
18.160
|
1.501
|
|
21.180
|
1.487
|
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