Alkor Technologies manufactures KCl optical elements: KCl windows, Drilled KCl windows, KCl wedges according to customer's specifications. The largest dimensions of KCl optics: 300 mm Dia x 50 mm Thk.
Potassium Chloride is mainly used for CO2 laser protection windows as an inexpensive disposable material with a low refractive index.
Please contact us for more information.
KCl transmittance. Sample thickness 10mm.
Potassium Chloride is used for infrared windows, lenses and prisms when transmission in the range 0.3-20mkm is desired (transmission extends beyond that of Sodium Chloride). Potassium Chloride is soluble in water and polished surfaces of KCl windows must be protected from moisture. KCl windows can be used at temperatures up to 400°C.
| KCl properties |
| Chemical Formula |
KCl |
| Crystal Class |
Cubic |
| Lattice Constant, Å |
6.29 |
| Molecular Weight |
74.55 |
| Density, g/cm3 (20 °C) |
1.98 |
| Reflection Loss, % for two surfaces at 10 µm |
6.8 |
| Dielectric Constant for 106 Hz at 302 K |
4.64 |
| Melting Temperature, K |
1050 |
| Thermal Conductivity, W/(m K) at 315 K |
6.7 |
| Thermal Expansion, 1/K at 300 K |
36.6 x 10-6 |
| Specific Heat, cal/(g K) at 273 K |
0.162 |
| Debye Temperature, K |
235 |
| Bandgap, eV |
8.5 |
| Solubility, g/100 g H2O at 293 K |
34.7 |
| Knoop Hardness, kg/mm2 |
7.2[110], 9.3[100] |
| Young's Modulus, GPa |
29.63 |
| Rupture Modulus, GPa |
0.0044 |
| Shear Modulus, GPa |
6.24 |
| Bulk Modulus, GPa |
17.36 |
| Refractive index of Kcl |
| Wavelength, µm |
0.40 |
0.59 |
5.30 |
11.7 |
15.0 |
18.1 |
20.2 |
22.8 |
24.3 |
| Refractive Index |
1.51 |
1.49 |
1.47 |
1.45 |
1.43 |
1.41 |
1.39 |
1.37 |
1.35 |
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