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Thallium Bromoiodide (KRS-5)
Thallium Bromoiodide is widely used for optics when transmission to about 40µm is desired. KRS-5 is relatively insoluble in water and may be used in cells in contact with aqueous solutions.
KRS-5 is superior to the simple Bromide and Iodide Salts in that it is much harder. The top operating temperature is 200°C. The material does not cleave but will flow under pressure. The softness of the material limits the optical figure and surface quality that can be achieved in fabrication.
| Property |
Specification |
| Transmission Range |
0.6µm to 40µm |
| Density |
7.371 gm/cc |
| Thermal Expansion |
58 x 10-6 /°C |
| Surface Finish |
Generally a low scatter polish for the infrared (80-50 scratch-dig). |
| AR Coating Options |
Moisture Protection (specify wavelength of use). |
| Typical Applications |
Attenuated total reflection prisms, IR windows & lenses. |
| Products Manufactured |
Windows, Lenses, Wedges, Prism, Aspheric Lenses, Beamsplitters. |
|
Wavelength (µm)
|
Index of Refraction (n)
|
|
2.0
|
2.395
|
|
4.0
|
2.382
|
|
6.0
|
2.378
|
|
8.0
|
2.375
|
|
10.0
|
2.371
|
|
12.0
|
2.366
|
|
14.0
|
2.364
|
|
16.0
|
2.355
|
|
20.0
|
2.341
|
|
22.0
|
2.332
|
|
24.0
|
2.323
|
|
26.0
|
2.312
|
|
28.0
|
2.301
|
|
30.0
|
2.289
|
|
32.0
|
2.275
|
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