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Potassium Chloride (KCl)
Potassium Chloride is used for low cost CO2 laser optics and infrared windows, lenses, and prisms when transmission in the range to 20µm is desired (transmission extends beyond that of Sodium Chloride). Potassium Chloride is soluble in water and polished surfaces must be protected from moisture. Maximum use temperature is 400°C.
| Property |
Specification |
| Transmission Range |
0.21µm to 20µm |
| Density |
1.989
gm/cm3 |
| Thermal Expansion |
36 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)
|
|
2.3573
|
1.475
|
|
4.7146
|
1.471
|
|
5.8932
|
1.469
|
|
8.2505
|
1.463
|
|
10.0184
|
1.457
|
|
12.9650
|
1.443
|
|
14.1410
|
1.437
|
|
15.9120
|
1.426
|
|
18.2000
|
1.409
|
|
20.4000
|
1.389
|
|
22.2000
|
1.374
|
|
24.1000
|
1.352
|
|
26.7000
|
1.300
|
|
28.2000
|
1.254
|
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