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POTASSIUM CHLORIDE (KCl) OPTICAL COMPONENTS

Alkor Technologies manufactures KCl optical elements: KCl windows, KCl wedges according to customer's specifications and drawings. The largest dimensions of KCl optics : 400 mm Dia x 50 mm Thk. Please contact us for more information. KCl transmission

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.

Main 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

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
Tel: +7(812)3631240 Fax: +7(812)3631239 Email: technologies@alkor.net