Material Potassium Cloride (KCl)
Potassium Chloride is mainly used for CO2 laser protection windows as an inexpensive disposable material with a low indexand for infrared lenses and prisms when transmission in the 0.3 µm - 20 µm range is desired. Potassium Chloride is soluble in water and polished surfaces must be protected from exposure to moisture. Maximum operating temperature is 400 °C. Maximum available size: 200 mm Dia x 40 mm Thk. Potassium Chloride is produced in large ingots by the Kyropoulos growth method. It cleaves easily. With care it can be polished to a high standard under humidity controlled conditions.
BASE PROPERTIES
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PARAMETER |
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VALUE |
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| OPTICAL |
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| |
Transmission Range |
|
0.21 - 20 microns |
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| |
Refractive Index |
|
1.45644 at 10 microns |
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| |
Reflection Loss |
|
6.8% at 10 µm (2 surfaces) |
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| |
dn/dT |
|
-33.2 x 10-6/K |
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| |
Index of Absorption |
|
1.22 х10-3 cm-1 at 2.7µm |
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| PHYSICAL |
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| |
Density |
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1.99 g/cm3 |
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Melting Point |
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776° C |
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Thermal Conductivity |
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6.53 W/(m K) at 322 К |
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| |
Thermal Expansion |
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36 x 10-6/К at 300 К |
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Hardness |
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Knoop 7.2 <110>, 9.3 <100> with 200g |
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| |
Specific Heat Capacity |
|
690 J/(kg K) |
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Dielectric Constant |
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4.64 at 300 K |
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Young's Modulus (E) |
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29.67 GPa |
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| |
Shear Modulus (G) |
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6.24 GPa |
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Bulk Modulus (K) |
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17.36 GPa |
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| |
Elastic Coefficients |
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C11=39.8 MPa, C12=6.2
MPa,
C44=6.25 MPa |
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Apparent Elastic Limit |
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2.3 MPa (330psi) |
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Poisson Ratio |
|
0.216 |
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| CHEMICAL |
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| |
Solubility |
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34.7g/100g water |
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Molecular Weight |
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74.55 |
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Class/Structure |
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Cubic FCC, NaCl, Fm3m, (100) cleavage |
|
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 |
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